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Table of Contents

The Plant Cell Online: 25 (10)
Oct 2013

IN BRIEF

  • Good Neighbor Hypothesis of Lignification Holds for Xylem Cells, but Not for Interfascicular Fibers
    You have accessRestricted Access
    Good Neighbor Hypothesis of Lignification Holds for Xylem Cells, but Not for Interfascicular Fibers
    Kathleen L. Farquharson
    Plant Cell Oct 2013, 25 (10) 3635; DOI: https://doi.org/10.1105/tpc.113.251010
  • Plastid Genes That Were Lost along the Road to Parasitism
    You have accessRestricted Access
    Plastid Genes That Were Lost along the Road to Parasitism
    Jennifer Lockhart
    Plant Cell Oct 2013, 25 (10) 3636; DOI: https://doi.org/10.1105/tpc.113.251011
  • Ethanolamide Oxylipins: New Players in Seedling Development
    You have accessRestricted Access
    Ethanolamide Oxylipins: New Players in Seedling Development
    Nancy R. Hofmann
    Plant Cell Oct 2013, 25 (10) 3637; DOI: https://doi.org/10.1105/tpc.113.251012
  • Border Patrol on the Extrahaustorial Membrane: <em>Arabidopsis</em> Resistance Protein RPW8.2 Activates Targeted, Postpenetration Defenses
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    Border Patrol on the Extrahaustorial Membrane: Arabidopsis Resistance Protein RPW8.2 Activates Targeted, Postpenetration Defenses
    Jennifer Mach
    Plant Cell Oct 2013, 25 (10) 3638; DOI: https://doi.org/10.1105/tpc.113.251014
  • <em>The Plant Cell</em> Reviews Alternative Splicing
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    The Plant Cell Reviews Alternative Splicing
    Nancy A. Eckardt
    Plant Cell Oct 2013, 25 (10) 3639; DOI: https://doi.org/10.1105/tpc.113.251013

REVIEWS

  • Alternative Splicing at the Intersection of Biological Timing, Development, and Stress Responses
    Open Access
    Alternative Splicing at the Intersection of Biological Timing, Development, and Stress Responses
    Dorothee Staiger, John W.S. Brown
    Plant Cell Oct 2013, 25 (10) 3640-3656; DOI: https://doi.org/10.1105/tpc.113.113803
  • Complexity of the Alternative Splicing Landscape in Plants
    Open Access
    Complexity of the Alternative Splicing Landscape in Plants
    Anireddy S.N. Reddy, Yamile Marquez, Maria Kalyna, Andrea Barta
    Plant Cell Oct 2013, 25 (10) 3657-3683; DOI: https://doi.org/10.1105/tpc.113.117523

LARGE-SCALE BIOLOGY ARTICLES

  • Reticulate Evolution of the Rye Genome
    Open Access
    Reticulate Evolution of the Rye Genome
    Mihaela M. Martis, Ruonan Zhou, Grit Haseneyer, Thomas Schmutzer, Jan Vrána, Marie Kubaláková, Susanne König, Karl G. Kugler, Uwe Scholz, Bernd Hackauf, Viktor Korzun, Chris-Carolin Schön, Jaroslav Doležel, Eva Bauer, Klaus F.X. Mayer, Nils Stein
    Plant Cell Oct 2013, 25 (10) 3685-3698; DOI: https://doi.org/10.1105/tpc.113.114553

    Survey sequences of rye chromosomes were integrated with a new transcript map and a comparative genomics model to linearly order 22,426 gene loci. The rye genome exhibits five consecutive rearrangements in comparison to barley. Sequence and phylogenetic analysis reveal characteristics of introgressive hybridization and reticulated evolution of the rye genome.

  • Translational Landscape of Photomorphogenic <em>Arabidopsis</em>
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    Translational Landscape of Photomorphogenic Arabidopsis
    Ming-Jung Liu, Szu-Hsien Wu, Jing-Fen Wu, Wen-Dar Lin, Yi-Chen Wu, Tsung-Ying Tsai, Huang-Lung Tsai, Shu-Hsing Wu
    Plant Cell Oct 2013, 25 (10) 3699-3710; DOI: https://doi.org/10.1105/tpc.113.114769

    This work describes translational activity at single-nucleotide resolution in deetiolating Arabidopsis. Light selectively triggers the increase or decrease of ribosome density of specific transcripts. This work also reports the global effects of upstream open reading frames and microRNAs in negatively regulating the translation of annotated open reading frames in deetiolating Arabidopsis.

  • Mechanisms of Functional and Physical Genome Reduction in Photosynthetic and Nonphotosynthetic Parasitic Plants of the Broomrape Family
    Open Access
    Mechanisms of Functional and Physical Genome Reduction in Photosynthetic and Nonphotosynthetic Parasitic Plants of the Broomrape Family
    Susann Wicke, Kai F. Müller, Claude W. de Pamphilis, Dietmar Quandt, Norman J. Wickett, Yan Zhang, Susanne S. Renner, Gerald M. Schneeweiss
    Plant Cell Oct 2013, 25 (10) 3711-3725; DOI: https://doi.org/10.1105/tpc.113.113373

    The authors report the structure of ten plastid genomes from hemi- and holoparasitic plants and their closest nonparasitic relative. Structural plastome reconfiguration is associated with obligate parasitism. The extent of genome reduction after the loss of photosynthesis is governed by dispensable genes’ proximity to essential genes and the position in operons or by alternative gene function.

  • Nonsense-Mediated Decay of Alternative Precursor mRNA Splicing Variants Is a Major Determinant of the <em>Arabidopsis</em> Steady State Transcriptome
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    Nonsense-Mediated Decay of Alternative Precursor mRNA Splicing Variants Is a Major Determinant of the Arabidopsis Steady State Transcriptome
    Gabriele Drechsel, André Kahles, Anil K. Kesarwani, Eva Stauffer, Jonas Behr, Philipp Drewe, Gunnar Rätsch, Andreas Wachter
    Plant Cell Oct 2013, 25 (10) 3726-3742; DOI: https://doi.org/10.1105/tpc.113.115485

    Alternative precursor mRNA splicing represents a major mechanism to increase transcriptome diversity in higher eukaryotes. This work demonstrates that a substantial fraction of the alternative splicing variants from Arabidopsis thaliana is subject to turn over via the RNA quality-control mechanism nonsense-mediated decay, having important implications for the regulation of gene expression.

RESEARCH ARTICLES

  • Genome-Wide Binding Analysis of the Transcription Activator IDEAL PLANT ARCHITECTURE1 Reveals a Complex Network Regulating Rice Plant Architecture
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    Genome-Wide Binding Analysis of the Transcription Activator IDEAL PLANT ARCHITECTURE1 Reveals a Complex Network Regulating Rice Plant Architecture
    Zefu Lu, Hong Yu, Guosheng Xiong, Jing Wang, Yongqing Jiao, Guifu Liu, Yanhui Jing, Xiangbing Meng, Xingming Hu, Qian Qian, Xiangdong Fu, Yonghong Wang, Jiayang Li
    Plant Cell Oct 2013, 25 (10) 3743-3759; DOI: https://doi.org/10.1105/tpc.113.113639

    This work shows that the key rice architecture regulator IPA1 binds to promoters of target genes directly or indirectly at a different motif by interacting with PCF1 and PCF2. Expression profiling and further characterization of these target genes reveal a complex genetic regulatory network orchestrated by IPA1, providing insight into the regulation of plant development.

  • Nighttime Sugar Starvation Orchestrates Gibberellin Biosynthesis and Plant Growth in <em>Arabidopsis</em>
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    Nighttime Sugar Starvation Orchestrates Gibberellin Biosynthesis and Plant Growth in Arabidopsis
    Eleonora Paparelli, Sandro Parlanti, Silvia Gonzali, Giacomo Novi, Lorenzo Mariotti, Nello Ceccarelli, Joost T. van Dongen, Katharina Kölling, Samuel C. Zeeman, Pierdomenico Perata
    Plant Cell Oct 2013, 25 (10) 3760-3769; DOI: https://doi.org/10.1105/tpc.113.115519

    This work demonstrates that plants integrate the efficiency of photosynthesis over a period of days and transduce that information into a daily rate of gibberellin synthesis. This enables a plant to match its growth rate to its environment without unnecessary short-term fluctuations.

  • HFR1 Sequesters PIF1 to Govern the Transcriptional Network Underlying Light-Initiated Seed Germination in <em>Arabidopsis</em>
    Open Access
    HFR1 Sequesters PIF1 to Govern the Transcriptional Network Underlying Light-Initiated Seed Germination in Arabidopsis
    Hui Shi, Shangwei Zhong, Xiaorong Mo, Na Liu, Cynthia D. Nezames, Xing Wang Deng
    Plant Cell Oct 2013, 25 (10) 3770-3784; DOI: https://doi.org/10.1105/tpc.113.117424

    This study identifies the LONG HYPOCOTYL IN FAR-RED1 (HFR1)– PHYTOCHROME-INTERACTING FACTOR 1 (PIF1) pair as the central transcriptional regulatory module for rapid light-initiated transcriptome changes in imbibed seeds. HFR1 interacts with PIF1 to prevent PIF1 from binding to DNA, promoting light-initiated germination. The functionally antagonistic HFR1–PIF1 pair constructs a fail-safe mechanism for fine-tuning seed germination under low-level illumination.

  • Flower Development under Drought Stress: Morphological and Transcriptomic Analyses Reveal Acute Responses and Long-Term Acclimation in <em>Arabidopsis</em>
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    Flower Development under Drought Stress: Morphological and Transcriptomic Analyses Reveal Acute Responses and Long-Term Acclimation in Arabidopsis
    Zhao Su, Xuan Ma, Huihong Guo, Noor Liyana Sukiran, Bin Guo, Sarah M. Assmann, Hong Ma
    Plant Cell Oct 2013, 25 (10) 3785-3807; DOI: https://doi.org/10.1105/tpc.113.115428

    Drought dramatically affects plant reproductive development and crop yield, but previous research has primarily focused on vegetative development. This work uses a scheme that allows plant growth with limited water to study plant responses to drought during reproductive development. The authors examine floral developmental defects and identify key genes affecting this process.

  • Copy Number Variation in Transcriptionally Active Regions of Sexual and Apomictic <em>Boechera</em> Demonstrates Independently Derived Apomictic Lineages
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    Copy Number Variation in Transcriptionally Active Regions of Sexual and Apomictic Boechera Demonstrates Independently Derived Apomictic Lineages
    Olawale M. Aliyu, Michael Seifert, José M. Corral, Joerg Fuchs, Timothy F. Sharbel
    Plant Cell Oct 2013, 25 (10) 3808-3823; DOI: https://doi.org/10.1105/tpc.113.113860

    This work compared the genomic signature of variable copy numbers of transcribed genes between sexual and asexual (apomictic) plants of the genus Boechera and showed that the apomictic phenotype has been expressed multiple times from different sexual genetic backgrounds.

  • Ethanolamide Oxylipins of Linolenic Acid Can Negatively Regulate <em>Arabidopsis</em> Seedling Development
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    Ethanolamide Oxylipins of Linolenic Acid Can Negatively Regulate Arabidopsis Seedling Development
    Jantana Keereetaweep, Elison B. Blancaflor, Ellen Hornung, Ivo Feussner, Kent D. Chapman
    Plant Cell Oct 2013, 25 (10) 3824-3840; DOI: https://doi.org/10.1105/tpc.113.119024

    In this work, endogenous NAE 18:3-oxylipins in various lines of Arabidopsis seedlings were detected and quantified. The results reveal a profound influence of NAE metabolism on seedling development, providing evidence that endogenous ethanolamide oxylipins may have potent biological activities during seedling establishment.

  • The <em>Arabidopsis</em> Eukaryotic Translation Initiation Factor eIF5A-2 Regulates Root Protoxylem Development by Modulating Cytokinin Signaling
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    The Arabidopsis Eukaryotic Translation Initiation Factor eIF5A-2 Regulates Root Protoxylem Development by Modulating Cytokinin Signaling
    Bo Ren, Qingguo Chen, Sulei Hong, Wenming Zhao, Jian Feng, Haizhong Feng, Jianru Zuo
    Plant Cell Oct 2013, 25 (10) 3841-3857; DOI: https://doi.org/10.1105/tpc.113.116236

    This work shows that the Arabidopsis eukaryotic translation initiation factor 5A-2 genetically and physically interacts with key signaling components of the cytokinin pathway to specifically regulate root protoxylem development.

  • Regulation of Auxin Homeostasis and Gradients in <em>Arabidopsis</em> Roots through the Formation of the Indole-3-Acetic Acid Catabolite 2-Oxindole-3-Acetic Acid
    Open Access
    Regulation of Auxin Homeostasis and Gradients in Arabidopsis Roots through the Formation of the Indole-3-Acetic Acid Catabolite 2-Oxindole-3-Acetic Acid
    Aleš Pěnčík, Biljana Simonovik, Sara V. Petersson, Eva Henyková, Sibu Simon, Kathleen Greenham, Yi Zhang, Mariusz Kowalczyk, Mark Estelle, Eva Zažímalová, Ondřej Novák, Göran Sandberg, Karin Ljung
    Plant Cell Oct 2013, 25 (10) 3858-3870; DOI: https://doi.org/10.1105/tpc.113.114421

    This work shows that one of the major auxin degradation products in Arabidopsis roots is 2-oxindole-3-acetic acid (oxIAA). OxIAA levels increased rapidly in line with endogenous indole-3-acetic acid (IAA) levels, and oxIAA had much lower biological activity than IAA. Data presented indicate that IAA catabolism plays an important role in the regulation of auxin homeostasis and auxin gradient formation in the primary root apex.

  • ABI1 and PP2CA Phosphatases Are Negative Regulators of Snf1-Related Protein Kinase1 Signaling in <em>Arabidopsis</em>
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    ABI1 and PP2CA Phosphatases Are Negative Regulators of Snf1-Related Protein Kinase1 Signaling in Arabidopsis
    Américo Rodrigues, Mattia Adamo, Pierre Crozet, Leonor Margalha, Ana Confraria, Cláudia Martinho, Alexandre Elias, Agnese Rabissi, Victoria Lumbreras, Miguel González-Guzmán, Regina Antoni, Pedro L. Rodriguez, Elena Baena-González
    Plant Cell Oct 2013, 25 (10) 3871-3884; DOI: https://doi.org/10.1105/tpc.113.114066

    SnRK1 protein kinases are negatively regulated by the same PP2C phosphatases that repress the action of the central phytohormone abscisic acid (ABA). During environmental stress, ABA releases PP2C repression, thereby activating two key and complementary pathways and providing better protection against stress through the joined modulation of metabolism and gene expression.

  • Replication Protein A2c Coupled with Replication Protein A1c Regulates Crossover Formation during Meiosis in Rice
    Open Access
    Replication Protein A2c Coupled with Replication Protein A1c Regulates Crossover Formation during Meiosis in Rice
    Xingwang Li, Yuxiao Chang, Xiaodong Xin, Chunmei Zhu, Xianghua Li, James D. Higgins, Changyin Wu
    Plant Cell Oct 2013, 25 (10) 3885-3899; DOI: https://doi.org/10.1105/tpc.113.118042

    This study analyzed the role of the Replication protein A (RPA) complex in meiotic crossover formation in rice. RPA ensures that every chromosome pair possesses at least one crossover, and if this complex is mutated, chromosomes mis-segregate and plants are sterile.

  • Centromere Pairing in Early Meiotic Prophase Requires Active Centromeres and Precedes Installation of the Synaptonemal Complex in Maize
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    Centromere Pairing in Early Meiotic Prophase Requires Active Centromeres and Precedes Installation of the Synaptonemal Complex in Maize
    Jing Zhang, Wojciech P. Pawlowski, Fangpu Han
    Plant Cell Oct 2013, 25 (10) 3900-3909; DOI: https://doi.org/10.1105/tpc.113.117846

    This work provides evidence that centromere pairing occurs prior to telomere bouquet formation in early meiotic prophase in maize and is dependent upon centromere activity. Centromere association, in contrast with that in yeast and Drosophila, precedes ZYP1 installation. SMC6 is required for centromere pairing.

  • Mediation of Clathrin-Dependent Trafficking during Cytokinesis and Cell Expansion by <em>Arabidopsis</em> STOMATAL CYTOKINESIS DEFECTIVE Proteins
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    Mediation of Clathrin-Dependent Trafficking during Cytokinesis and Cell Expansion by Arabidopsis STOMATAL CYTOKINESIS DEFECTIVE Proteins
    Colleen M. McMichael, Gregory D. Reynolds, Lisa M. Koch, Chao Wang, Nan Jiang, Jeanette Nadeau, Fred D. Sack, Max B. Gelderman, Jianwei Pan, Sebastian Y. Bednarek
    Plant Cell Oct 2013, 25 (10) 3910-3925; DOI: https://doi.org/10.1105/tpc.113.115162

    Clathrin-mediated membrane trafficking is essential for cytokinesis and cell expansion. This study shows that SCD2 and SCD1, a putative Rab GEF, which coordinate to regulate cytokinesis and cell expansion in Arabidopsis, are associated with clathrin-coated vesicles and are necessary for plasma membrane endocytosis.

  • The PHOTOSYNTHESIS AFFECTED MUTANT68–LIKE Protein Evolved from a PSII Assembly Factor to Mediate Assembly of the Chloroplast NAD(P)H Dehydrogenase Complex in <em>Arabidopsis</em>
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    The PHOTOSYNTHESIS AFFECTED MUTANT68–LIKE Protein Evolved from a PSII Assembly Factor to Mediate Assembly of the Chloroplast NAD(P)H Dehydrogenase Complex in Arabidopsis
    Ute Armbruster, Thilo Rühle, Renate Kreller, Christoph Strotbek, Jessica Zühlke, Luca Tadini, Thomas Blunder, Alexander P. Hertle, Yafei Qi, Birgit Rengstl, Jörg Nickelsen, Wolfgang Frank, Dario Leister
    Plant Cell Oct 2013, 25 (10) 3926-3943; DOI: https://doi.org/10.1105/tpc.113.114785

    Assembly factors are auxiliary proteins that promote the biogenesis of multiprotein complexes without being subunits of those. PHOTOSYNTHESIS-AFFECTED MUTANT68-LIKE (PAM68L) operates as an assembly factor of the NAD(P)H dehydrogenase complex in chloroplasts of flowering plants and derives evolutionarily from PAM68, an assembly factor of photosystem II in cyanobacteria, mosses, and plants.

  • Cell Growth Defect Factor1/CHAPERONE-LIKE PROTEIN OF POR1 Plays a Role in Stabilization of Light-Dependent Protochlorophyllide Oxidoreductase in <em>Nicotiana benthamiana</em> and <em>Arabidopsis</em>
    You have accessRestricted Access
    Cell Growth Defect Factor1/CHAPERONE-LIKE PROTEIN OF POR1 Plays a Role in Stabilization of Light-Dependent Protochlorophyllide Oxidoreductase in Nicotiana benthamiana and Arabidopsis
    Jae-Yong Lee, Ho-Seok Lee, Ji-Young Song, Young Jun Jung, Steffen Reinbothe, Youn-Il Park, Sang Yeol Lee, Hyun-Sook Pai
    Plant Cell Oct 2013, 25 (10) 3944-3960; DOI: https://doi.org/10.1105/tpc.113.111096

    Protochlorophyllide oxidoreductase (POR), which catalyzes the protochlorophyllide reduction step in the chlorophyll biosynthetic pathway, is activated by light, and its substrate and product are photosensitizers. This work reports that CHAPERONE-LIKE PROTEIN OF POR1 interacts with POR isoforms in chloroplast membranes and protects POR proteins from photooxidative damage with its chaperone activity.

  • Convergent Evolution of Polysaccharide Debranching Defines a Common Mechanism for Starch Accumulation in Cyanobacteria and Plants
    You have accessRestricted Access
    Convergent Evolution of Polysaccharide Debranching Defines a Common Mechanism for Starch Accumulation in Cyanobacteria and Plants
    Ugo Cenci, Malika Chabi, Mathieu Ducatez, Catherine Tirtiaux, Jennifer Nirmal-Raj, Yoshinori Utsumi, Daiki Kobayashi, Satoshi Sasaki, Eiji Suzuki, Yasunori Nakamura, Jean-Luc Putaux, Xavier Roussel, Amandine Durand-Terrasson, Debashish Bhattacharya, Anne-Sophie Vercoutter-Edouart, Emmanuel Maes, Maria Cecilia Arias, Monica Palcic, Lyann Sim, Steven G. Ball, Christophe Colleoni
    Plant Cell Oct 2013, 25 (10) 3961-3975; DOI: https://doi.org/10.1105/tpc.113.118174

    In photosynthetic eukaryotes, starch aggregates into insoluble, semicrystalline granules through the action of a debranching enzyme of chlamydial pathogen origin. It is shown that an enzyme of analogous nature to this enzyme but of a different bacterial origin was recruited, by convergent evolution, for the same purpose in single-cell cyanobacteria.

  • <em>LACCASE</em> Is Necessary and Nonredundant with <em>PEROXIDASE</em> for Lignin Polymerization during Vascular Development in <em>Arabidopsis</em>
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    LACCASE Is Necessary and Nonredundant with PEROXIDASE for Lignin Polymerization during Vascular Development in Arabidopsis
    Qiao Zhao, Jin Nakashima, Fang Chen, Yanbin Yin, Chunxiang Fu, Jianfei Yun, Hui Shao, Xiaoqiang Wang, Zeng-Yu Wang, Richard A. Dixon
    Plant Cell Oct 2013, 25 (10) 3976-3987; DOI: https://doi.org/10.1105/tpc.113.117770

    Laccases and peroxidases are encoded by large gene families in plants, and both enzymes have been implicated in the polymerization of monolignols during lignification. Loss of function of three LACCASE genes in Arabidopsis essentially eliminates lignification in root and stem tissue, in the absence of reductions in peroxidase transcripts, indicating that laccase is essential for lignification.

  • Neighboring Parenchyma Cells Contribute to <em>Arabidopsis</em> Xylem Lignification, while Lignification of Interfascicular Fibers Is Cell Autonomous
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    Neighboring Parenchyma Cells Contribute to Arabidopsis Xylem Lignification, while Lignification of Interfascicular Fibers Is Cell Autonomous
    Rebecca A. Smith, Mathias Schuetz, Melissa Roach, Shawn D. Mansfield, Brian Ellis, Lacey Samuels
    Plant Cell Oct 2013, 25 (10) 3988-3999; DOI: https://doi.org/10.1105/tpc.113.117176

    Lignification provides strength to cells with secondary cell walls, such as fibers and water-conducting tracheary elements. In this study, the timing of lignification was examined using autoradiography, and targeted knockdown of lignin biosynthesis indicated that fibers undergo cell autonomous lignifications, while neighboring nonlignified cells can contribute to xylem cell lignification.

  • An ATP Binding Cassette Transporter Is Required for Cuticular Wax Deposition and Desiccation Tolerance in the Moss <em>Physcomitrella patens</em>
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    An ATP Binding Cassette Transporter Is Required for Cuticular Wax Deposition and Desiccation Tolerance in the Moss Physcomitrella patens
    Gregory J. Buda, William J. Barnes, Eric A. Fich, Sungjin Park, Trevor H. Yeats, Lingxia Zhao, David S. Domozych, Jocelyn K.C. Rose
    Plant Cell Oct 2013, 25 (10) 4000-4013; DOI: https://doi.org/10.1105/tpc.113.117648

    This study reveals that the moss Physcomitrella patens has a cuticle that is compositionally and structurally similar to those of later diverging land plants. A genetic knockout of a moss putative ABCG transporter, ABCG7, is deficient in cuticular wax accumulation and susceptible to desiccation stress. The cuticle appears to be a highly conserved evolutionary adaptation to life on land.

  • The Evolutionarily Conserved Iron-Sulfur Protein INDH Is Required for Complex I Assembly and Mitochondrial Translation in <em>Arabidopsis</em>
    Open Access
    The Evolutionarily Conserved Iron-Sulfur Protein INDH Is Required for Complex I Assembly and Mitochondrial Translation in Arabidopsis
    Mateusz M. Wydro, Pia Sharma, Jonathan M. Foster, Katrine Bych, Etienne H. Meyer, Janneke Balk
    Plant Cell Oct 2013, 25 (10) 4014-4027; DOI: https://doi.org/10.1105/tpc.113.117283

    Respiratory complex I is composed of 48 protein subunits of both nuclear and mitochondrial genetic origin. This study provides a functional characterization of INDH, which is required for the assembly of complex I but is not part of it. Unlike other complex I mutants, INDH is also involved in male and female gametogenesis and plays a role in mitochondrial translation.

  • In Vivo Intracellular pH Measurements in Tobacco and <em>Arabidopsis</em> Reveal an Unexpected pH Gradient in the Endomembrane System
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    In Vivo Intracellular pH Measurements in Tobacco and Arabidopsis Reveal an Unexpected pH Gradient in the Endomembrane System
    Alexandre Martinière, Elias Bassil, Elodie Jublanc, Carine Alcon, Maria Reguera, Hervé Sentenac, Eduardo Blumwald, Nadine Paris
    Plant Cell Oct 2013, 25 (10) 4028-4043; DOI: https://doi.org/10.1105/tpc.113.116897

    This work combines biochemistry and live-cell imaging to perform in vivo pH measurements of different compartments of the endomembrane system in plant cells. It reports that the prevacuolar compartments are more alkaline than the trans-Golgi network and provides evidence that endosomal proton pumps and proton efflux transporters contribute to pH homeostasis.

  • Identification of Downstream Components of Ubiquitin-Conjugating Enzyme PHOSPHATE2 by Quantitative Membrane Proteomics in <em>Arabidopsis</em> Roots
    Open Access
    Identification of Downstream Components of Ubiquitin-Conjugating Enzyme PHOSPHATE2 by Quantitative Membrane Proteomics in Arabidopsis Roots
    Teng-Kuei Huang, Chia-Li Han, Shu-I Lin, Yu-Ju Chen, Yi-Chuan Tsai, Yet-Ran Chen, June-Wei Chen, Wei-Yi Lin, Pei-Mien Chen, Tzu-Yin Liu, Ying-Shin Chen, Ching-Mei Sun, Tzyy-Jen Chiou
    Plant Cell Oct 2013, 25 (10) 4044-4060; DOI: https://doi.org/10.1105/tpc.113.115998

    This work reports quantitative membrane proteomic analysis and provides insights into the mechanism of PHO2-mediated Pi acquisition via posttranslational regulation of PHT1s. The results highlight the fundamental role of PHO2 in orchestrating Pi acquisition at the root surface and Pi loading at the xylem of root stele to maintain Pi homeostasis.

  • NITROGEN LIMITATION ADAPTATION, a Target of MicroRNA827, Mediates Degradation of Plasma Membrane–Localized Phosphate Transporters to Maintain Phosphate Homeostasis in <em>Arabidopsis</em>
    Open Access
    NITROGEN LIMITATION ADAPTATION, a Target of MicroRNA827, Mediates Degradation of Plasma Membrane–Localized Phosphate Transporters to Maintain Phosphate Homeostasis in Arabidopsis
    Wei-Yi Lin, Teng-Kuei Huang, Tzyy-Jen Chiou
    Plant Cell Oct 2013, 25 (10) 4061-4074; DOI: https://doi.org/10.1105/tpc.113.116012

    This work reports that NLA mediates endocytosis and degradation of PHT1s via ubiquitination and functions cooperatively with PHO2 to regulate the abundance of PHT1s in different subcellular compartments. This finding uncovers a mechanism of modulation of Pi transport activity through the integration of miRNA-mediated posttranscriptional and ubiquitin-mediated posttranslational pathways.

  • Essential Role of the E3 Ubiquitin Ligase NOPPERABO1 in Schizogenous Intercellular Space Formation in the Liverwort <em>Marchantia polymorpha</em>
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    Essential Role of the E3 Ubiquitin Ligase NOPPERABO1 in Schizogenous Intercellular Space Formation in the Liverwort Marchantia polymorpha
    Kimitsune Ishizaki, Miya Mizutani, Masaki Shimamura, Akihide Masuda, Ryuichi Nishihama, Takayuki Kohchi
    Plant Cell Oct 2013, 25 (10) 4075-4084; DOI: https://doi.org/10.1105/tpc.113.117051

    NOPPERABO1 encodes a PUB-ARM–type E3 ubiquitin ligase localized at the plasma membrane that functions as a positive factor for schizogenous intercellular space formation in the liverwort Marchantia polymorpha. A significant T-DNA–tagged mutant in the emerging model liverwort, which occupies a critical position in the evolution of land plants, is reported.

  • Disrupting Autophagy Restores Peroxisome Function to an <em>Arabidopsis lon2</em> Mutant and Reveals a Role for the LON2 Protease in Peroxisomal Matrix Protein Degradation
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    Disrupting Autophagy Restores Peroxisome Function to an Arabidopsis lon2 Mutant and Reveals a Role for the LON2 Protease in Peroxisomal Matrix Protein Degradation
    Lisa M. Farmer, Mauro A. Rinaldi, Pierce G. Young, Charles H. Danan, Sarah E. Burkhart, Bonnie Bartel
    Plant Cell Oct 2013, 25 (10) 4085-4100; DOI: https://doi.org/10.1105/tpc.113.113407

    This study describes a screen for suppressors of peroxisomal defects that result from a dysfunctional peroxisomal protease in Arabidopsis and reveals that plant peroxisomes can be targeted by autophagy (pexophagy).

  • Plant Purine Nucleoside Catabolism Employs a Guanosine Deaminase Required for the Generation of Xanthosine in <em>Arabidopsis</em>
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    Plant Purine Nucleoside Catabolism Employs a Guanosine Deaminase Required for the Generation of Xanthosine in Arabidopsis
    Kathleen Dahncke, Claus-Peter Witte
    Plant Cell Oct 2013, 25 (10) 4101-4109; DOI: https://doi.org/10.1105/tpc.113.117184

    This work identifies a new enzyme, guanosine deaminase, which is specific for nucleoside catabolism of plants and not found in other organisms, outlining a plant-specific metabolic route. Guanosine deaminase exclusively generates xanthosine in the model plant Arabidopsis. In coffee, xanthosine is the precursor for caffeine production, which possibly requires guanosine deaminase as well.

  • Morphine Biosynthesis in Opium Poppy Involves Two Cell Types: Sieve Elements and Laticifers
    Open Access
    Morphine Biosynthesis in Opium Poppy Involves Two Cell Types: Sieve Elements and Laticifers
    Akpevwe Onoyovwe, Jillian M. Hagel, Xue Chen, Morgan F. Khan, David C. Schriemer, Peter J. Facchini
    Plant Cell Oct 2013, 25 (10) 4110-4122; DOI: https://doi.org/10.1105/tpc.113.115113

    Morphine biosynthesis is shown to involve two specialized cell types in opium poppy. Most of the pathway occurs in sieve elements of the phloem, but the final three enzymes are predominant in adjacent laticifers, which are the site of morphine accumulation. The cellular localization of morphine metabolism will assist with the breeding and metabolic engineering of this important medicinal plant.

  • A 7-Deoxyloganetic Acid Glucosyltransferase Contributes a Key Step in Secologanin Biosynthesis in Madagascar Periwinkle
    Open Access
    A 7-Deoxyloganetic Acid Glucosyltransferase Contributes a Key Step in Secologanin Biosynthesis in Madagascar Periwinkle
    Keisuke Asada, Vonny Salim, Sayaka Masada-Atsumi, Elizabeth Edmunds, Mai Nagatoshi, Kazuyoshi Terasaka, Hajime Mizukami, Vincenzo De Luca
    Plant Cell Oct 2013, 25 (10) 4123-4134; DOI: https://doi.org/10.1105/tpc.113.115154

    The biosynthesis of secologanin in Madagascar periwinkle involves iridoid assembly in specialized internal phloem-associated parenchyma (IPAP) and final elaboration in leaf epidermal cells. We report the molecular cloning, functional characterization, and IPAP-associated localization of 7-deoxyloganetic acid glucosyltransferase.

  • The R2R3-MYB Transcription Factors MYB14 and MYB15 Regulate Stilbene Biosynthesis in <em>Vitis vinifera</em>
    You have accessRestricted Access
    The R2R3-MYB Transcription Factors MYB14 and MYB15 Regulate Stilbene Biosynthesis in Vitis vinifera
    Janine Höll, Alessandro Vannozzi, Stefan Czemmel, Claudio D'Onofrio, Amanda R. Walker, Thomas Rausch, Margherita Lucchin, Paul K. Boss, Ian B. Dry, Jochen Bogs
    Plant Cell Oct 2013, 25 (10) 4135-4149; DOI: https://doi.org/10.1105/tpc.113.117127

    This study reports the identification and functional characterization of two stress-inducible R2R3-MYB–type transcription factors, termed MYB14 and MYB15, which regulate the stilbene biosynthetic pathway in grapevine.

  • <em>p</em>-Hydroxybenzoyl-Glucose Is a Zwitter Donor for the Biosynthesis of 7-Polyacylated Anthocyanin in Delphinium
    You have accessRestricted Access
    p-Hydroxybenzoyl-Glucose Is a Zwitter Donor for the Biosynthesis of 7-Polyacylated Anthocyanin in Delphinium
    Yuzo Nishizaki, Motoki Yasunaga, Emi Okamoto, Mitsutoshi Okamoto, Yukio Hirose, Masaatsu Yamaguchi, Yoshihiro Ozeki, Nobuhiro Sasaki
    Plant Cell Oct 2013, 25 (10) 4150-4165; DOI: https://doi.org/10.1105/tpc.113.113167

    Polyacylation of anthocyanin at the 7-position is crucial for the blue pigmentation of delphinium flowers. 7-Polyacylated anthocyanin is synthesized via a step-by-step reaction mediated by vacuolar type acyltransferases and glucosyltransferases in delphiniums. In this reaction sequence, p-hydroxybenzoyl-Glc plays a crucial role as a bifunctional donor for glucosylation and acylation.

  • A Rice <em>cis</em>-Natural Antisense RNA Acts as a Translational Enhancer for Its Cognate mRNA and Contributes to Phosphate Homeostasis and Plant Fitness
    You have accessRestricted Access
    A Rice cis-Natural Antisense RNA Acts as a Translational Enhancer for Its Cognate mRNA and Contributes to Phosphate Homeostasis and Plant Fitness
    Mehdi Jabnoune, David Secco, Cécile Lecampion, Christophe Robaglia, Qingyao Shu, Yves Poirier
    Plant Cell Oct 2013, 25 (10) 4166-4182; DOI: https://doi.org/10.1105/tpc.113.116251

    cis-natural antisense transcripts (cis-NAT) are widespread in plants and typically associated with transcriptional downregulation of their cognate sense gene. This works shows that a noncoding cis-NAT associated with the rice phosphate exporter gene PHO1;2 enhances translation of the sense PHO1;2 mRNA. Reduction of cis-NATPHO1;2 expression negatively impacts phosphate homeostasis and seed yield.

  • <em>Arabidopsis</em> J-Protein J20 Delivers the First Enzyme of the Plastidial Isoprenoid Pathway to Protein Quality Control
    You have accessRestricted Access
    Arabidopsis J-Protein J20 Delivers the First Enzyme of the Plastidial Isoprenoid Pathway to Protein Quality Control
    Pablo Pulido, Gabriela Toledo-Ortiz, Michael A. Phillips, Louwrance P. Wright, Manuel Rodríguez-Concepción
    Plant Cell Oct 2013, 25 (10) 4183-4194; DOI: https://doi.org/10.1105/tpc.113.113001

    Protein quality control mechanisms rely on chaperones and proteases to maintain cell proteins in working conditions. This study reports the identification of a J-protein cochaperone that binds to inactive forms of a plastidial enzyme required for plant photosynthesis and development, targeting them for either proper folding or degradation in the chloroplast.

  • The Importance of Cardiolipin Synthase for Mitochondrial Ultrastructure, Respiratory Function, Plant Development, and Stress Responses in <em>Arabidopsis</em>
    You have accessRestricted Access
    The Importance of Cardiolipin Synthase for Mitochondrial Ultrastructure, Respiratory Function, Plant Development, and Stress Responses in Arabidopsis
    Bernard Pineau, Mickaël Bourge, Jessica Marion, Caroline Mauve, Francoise Gilard, Lilly Maneta-Peyret, Patrick Moreau, Béatrice Satiat-Jeunemaître, Spencer C. Brown, Rosine De Paepe, Antoine Danon
    Plant Cell Oct 2013, 25 (10) 4195-4208; DOI: https://doi.org/10.1105/tpc.113.118018

    CARDIOLIPIN SYNTHASE (CLS) catalyzes the synthesis of cardiolipin, the signature phospholipid of the mitochondrial inner membrane. Through characterization of a cls mutant in Arabidopsis, this study shows that CLS is crucial for correct mitochondrial function and development in Arabidopsis under both optimal and stress conditions.

  • A Mediator of Singlet Oxygen Responses in <em>Chlamydomonas reinhardtii</em> and <em>Arabidopsis</em> Identified by a Luciferase-Based Genetic Screen in Algal Cells
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    A Mediator of Singlet Oxygen Responses in Chlamydomonas reinhardtii and Arabidopsis Identified by a Luciferase-Based Genetic Screen in Algal Cells
    Ning Shao, Guang You Duan, Ralph Bock
    Plant Cell Oct 2013, 25 (10) 4209-4226; DOI: https://doi.org/10.1105/tpc.113.117390

    This work presents a genetic screen for early components of singlet oxygen signaling using the unicellular green alga Chlamydomonas and reports the identification of a small zinc finger protein, MBS, that accumulates in distinct cytosolic granules and is required for induction of singlet oxygen–dependent gene expression in Chlamydomonas and Arabidopsis.

  • <em>Arabidopsis</em> RECEPTOR-LIKE PROTEIN30 and Receptor-Like Kinase SUPPRESSOR OF BIR1-1/EVERSHED Mediate Innate Immunity to Necrotrophic Fungi
    Open Access
    Arabidopsis RECEPTOR-LIKE PROTEIN30 and Receptor-Like Kinase SUPPRESSOR OF BIR1-1/EVERSHED Mediate Innate Immunity to Necrotrophic Fungi
    Weiguo Zhang, Malou Fraiture, Dagmar Kolb, Birgit Löffelhardt, Yoshitake Desaki, Freddy F.G. Boutrot, Mahmut Tör, Cyril Zipfel, Andrea A. Gust, Frédéric Brunner
    Plant Cell Oct 2013, 25 (10) 4227-4241; DOI: https://doi.org/10.1105/tpc.113.117010

    This work identifies a Sclerotinia sclerotiorum elicitor that is sensed by RECEPTOR-LIKE PROTEIN30 and evokes MAMP-triggered immunity via the BRASSINOSTEROID INSENSITIVE1-ASSOCIATED RECEPTOR KINASE1 and SUPPRESSOR OF BIR1-1/EVERSHED signaling pathway. Thus, this work demonstrates the relevance of pattern recognition receptor–triggered immunity in resistance to necrotrophic fungi.

  • A Comprehensive Mutational Analysis of the <em>Arabidopsis</em> Resistance Protein RPW8.2 Reveals Key Amino Acids for Defense Activation and Protein Targeting
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    A Comprehensive Mutational Analysis of the Arabidopsis Resistance Protein RPW8.2 Reveals Key Amino Acids for Defense Activation and Protein Targeting
    Wenming Wang, Yi Zhang, Yingqiang Wen, Robert Berkey, Xianfeng Ma, Zhiyong Pan, Dipti Bendigeri, Harlan King, Qiong Zhang, Shunyuan Xiao
    Plant Cell Oct 2013, 25 (10) 4242-4261; DOI: https://doi.org/10.1105/tpc.113.117226

    Mutational analyses of host-pathogen interface-localized Arabidopsis resistance protein RPW8.2 reveal three amino acids to be important in regulating defense function of RPW8.2 and two basic residue-enriched motifs to be critical for targeting RPW8.2 to the extrahaustorial membrane induced in epidermal cells by the powdery mildew fungus.

  • Crosstalk between the Unfolded Protein Response and Pathways That Regulate Pathogenic Development in <em>Ustilago maydis</em>
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    Crosstalk between the Unfolded Protein Response and Pathways That Regulate Pathogenic Development in Ustilago maydis
    Kai Heimel, Johannes Freitag, Martin Hampel, Julia Ast, Michael Bölker, Jörg Kämper
    Plant Cell Oct 2013, 25 (10) 4262-4277; DOI: https://doi.org/10.1105/tpc.113.115899

    Biotrophic development of fungal plant pathogens requires an intricate control mechanism that triggers morphogenetic transitions and proliferation in planta. In the corn smut fungus, the interactions between key regulators of the unfolded protein response and of the transcriptional network that regulates the pathogenic program define a developmental checkpoint critical for plant infection.

CORRECTION

  • You have accessRestricted Access
    Correction
    Plant Cell Oct 2013, 25 (10) 4278; DOI: https://doi.org/10.1105/tpc.113.251060
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The Plant Cell Online: 25 (10)
The Plant Cell
Vol. 25, Issue 10
Oct 2013
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