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Table of Contents

The Plant Cell Online: 26 (9)
Sep 2014

IN BRIEF

  • A Rice KNOX Transcription Factor Represses Brassinosteroid Production in the Shoot Apical Meristem
    You have accessRestricted Access
    A Rice KNOX Transcription Factor Represses Brassinosteroid Production in the Shoot Apical Meristem
    Kathleen L. Farquharson
    Plant Cell Sep 2014, 26 (9) 3469; DOI: https://doi.org/10.1105/tpc.114.131698
  • Advice to the Lovelorn Polyploid Plant
    You have accessRestricted Access
    Advice to the Lovelorn Polyploid Plant
    Jennifer Mach
    Plant Cell Sep 2014, 26 (9) 3470; DOI: https://doi.org/10.1105/tpc.114.131854
  • Supply Route: ABCG Transporters Act in the Construction of Suberin Barriers
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    Supply Route: ABCG Transporters Act in the Construction of Suberin Barriers
    Nancy R. Hofmann
    Plant Cell Sep 2014, 26 (9) 3471; DOI: https://doi.org/10.1105/tpc.114.132290

LARGE-SCALE BIOLOGY ARTICLES

  • Genome-Wide Analysis of Alternative Splicing in <em>Zea mays</em>: Landscape and Genetic Regulation
    You have accessRestricted Access
    Genome-Wide Analysis of Alternative Splicing in Zea mays: Landscape and Genetic Regulation
    Shawn R. Thatcher, Wengang Zhou, April Leonard, Bing-Bing Wang, Mary Beatty, Gina Zastrow-Hayes, Xiangyu Zhao, Andy Baumgarten, Bailin Li
    Plant Cell Sep 2014, 26 (9) 3472-3487; DOI: https://doi.org/10.1105/tpc.114.130773

    This work examines alternative splicing (AS) of pre-mRNA in maize, revealing thousands of new isoforms from intron-containing genes, some of which encode entirely different proteins from their closest known isoforms. Analysis of these isoforms and identification of genomic loci that regulate AS highlight the important role that AS plays in tissue identity and genotypic variation in maize.

RESEARCH ARTICLES

  • Genome-Wide Study of <em>KNOX</em> Regulatory Network Reveals Brassinosteroid Catabolic Genes Important for Shoot Meristem Function in Rice
    Open Access
    Genome-Wide Study of KNOX Regulatory Network Reveals Brassinosteroid Catabolic Genes Important for Shoot Meristem Function in Rice
    Katsutoshi Tsuda, Nori Kurata, Hajime Ohyanagi, Sarah Hake
    Plant Cell Sep 2014, 26 (9) 3488-3500; DOI: https://doi.org/10.1105/tpc.114.129122

    Gain- and loss-of-function studies revealed that the rice KNOX transcription factor OSH1 negatively regulates the brassinosteroid (BR) phytohormone pathway. Genomics approaches identified BR catabolism genes as direct targets of OSH1 in the shoot meristems. RNAi knockdown studies suggested that BR catabolism is important for shoot meristem function and for regulation of panicle branch angle.

  • ROP3 GTPase Contributes to Polar Auxin Transport and Auxin Responses and Is Important for Embryogenesis and Seedling Growth in <em>Arabidopsis</em>
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    ROP3 GTPase Contributes to Polar Auxin Transport and Auxin Responses and Is Important for Embryogenesis and Seedling Growth in Arabidopsis
    Jia-bao Huang, Huili Liu, Min Chen, Xiaojuan Li, Mingyan Wang, Yali Yang, Chunling Wang, Jiaqing Huang, Guolan Liu, Yuting Liu, Jian Xu, Alice Y. Cheung, Li-zhen Tao
    Plant Cell Sep 2014, 26 (9) 3501-3518; DOI: https://doi.org/10.1105/tpc.114.127902

    This work identifies the role of ROP3 GTPase in embryo development and auxin-dependent plant growth and shows that ROP3 is important to maintain the proper polarity of auxin efflux carriers PIN1 and PIN3 at the plasma membrane. The results link cell polarity to auxin-dependent patterning through the activity of ROP3.

  • MYB118 Represses Endosperm Maturation in Seeds of <em>Arabidopsis</em>
    You have accessRestricted Access
    MYB118 Represses Endosperm Maturation in Seeds of Arabidopsis
    Guillaume Barthole, Alexandra To, Chloé Marchive, Véronique Brunaud, Ludivine Soubigou-Taconnat, Nathalie Berger, Bertrand Dubreucq, Loïc Lepiniec, Sébastien Baud
    Plant Cell Sep 2014, 26 (9) 3519-3537; DOI: https://doi.org/10.1105/tpc.114.130021

    Storage compounds like oil and storage proteins accumulate both in the endosperm and in the embryo of Arabidopsis seeds. The MYB118 transcription factor is specifically expressed in the endosperm and represses storage compound synthesis in this tissue, thus contributing to establishment of the embryo as the main deposition site for reserves in the seed.

  • Overexpression of the Tomato Pollen Receptor Kinase LePRK1 Rewires Pollen Tube Growth to a Blebbing Mode
    Open Access
    Overexpression of the Tomato Pollen Receptor Kinase LePRK1 Rewires Pollen Tube Growth to a Blebbing Mode
    Cai-Ping Gui, Xin Dong, Hai-Kuan Liu, Wei-Jie Huang, Dong Zhang, Shu-Jie Wang, María Laura Barberini, Xiao-Yan Gao, Jorge Muschietti, Sheila McCormick, Wei-Hua Tang
    Plant Cell Sep 2014, 26 (9) 3538-3555; DOI: https://doi.org/10.1105/tpc.114.127381

    Pollen tubes are tubular structures that extend by tip growth. Upon overexpression of merely a single endogenous molecule, LePRK1, or a portion of it lacking its extracellular domain, pollen tube cells switched to an alternative mechanism for extension of the leading edge that is analogous to the blebbing growth mode reported for Dictyostelium and for Drosophila stem cells.

  • Hypomethylated Pollen Bypasses the Interploidy Hybridization Barrier in <em>Arabidopsis</em>
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    Hypomethylated Pollen Bypasses the Interploidy Hybridization Barrier in Arabidopsis
    Nicole Schatlowski, Philip Wolff, Juan Santos-González, Vera Schoft, Alexey Siretskiy, Rod Scott, Hisashi Tamaru, Claudia Köhler
    Plant Cell Sep 2014, 26 (9) 3556-3568; DOI: https://doi.org/10.1105/tpc.114.130120

    Paternal hypomethylation can bypass the interploidy hybridization barrier by alleviating the requirement for the epigenetic Polycomb Repressive Complex 2 (PRC2) in the endosperm. The hypomethylated pollen genome causes de novo CHG methylation directed to FIS-PRC2 target genes, suggesting that different epigenetic modifications can functionally substitute for each other.

  • ABCG Transporters Are Required for Suberin and Pollen Wall Extracellular Barriers in <em>Arabidopsis</em>
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    ABCG Transporters Are Required for Suberin and Pollen Wall Extracellular Barriers in Arabidopsis
    Vandana Yadav, Isabel Molina, Kosala Ranathunge, Indira Queralta Castillo, Steven J. Rothstein, Jason W. Reed
    Plant Cell Sep 2014, 26 (9) 3569-3588; DOI: https://doi.org/10.1105/tpc.114.129049

    Plants make tough barriers outside their cells in precise anatomical locations to control water and solute movement through their tissues. This work demonstrates that a family of transport proteins is required in Arabidopsis to form such barriers in roots and in seed coats and to make a functional pollen wall.

  • BBX19 Interacts with CONSTANS to Repress <em>FLOWERING LOCUS T</em> Transcription, Defining a Flowering Time Checkpoint in <em>Arabidopsis</em>
    You have accessRestricted Access
    BBX19 Interacts with CONSTANS to Repress FLOWERING LOCUS T Transcription, Defining a Flowering Time Checkpoint in Arabidopsis
    Chang-Quan Wang, Cade Guthrie, Mostafa Khoshhal Sarmast, Katayoon Dehesh
    Plant Cell Sep 2014, 26 (9) 3589-3602; DOI: https://doi.org/10.1105/tpc.114.130252

    BBX19, a transcription factor with two B-Box motifs, is a clock output component that functions as a flowering time checkpoint by physically interacting with CO and depleting the CO pool required for FT activation. The integrity of the Box1 motif is necessary for the functionality of BBX19.

  • Structural Basis for the Oligomerization of the MADS Domain Transcription Factor SEPALLATA3 in <em>Arabidopsis</em>
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    Structural Basis for the Oligomerization of the MADS Domain Transcription Factor SEPALLATA3 in Arabidopsis
    Sriharsha Puranik, Samira Acajjaoui, Simon Conn, Luca Costa, Vanessa Conn, Anthony Vial, Romain Marcellin, Rainer Melzer, Elizabeth Brown, Darren Hart, Günter Theißen, Catarina S. Silva, François Parcy, Renaud Dumas, Max Nanao, Chloe Zubieta
    Plant Cell Sep 2014, 26 (9) 3603-3615; DOI: https://doi.org/10.1105/tpc.114.127910

    The structure of the keratin-like domain of SEPALLATA3, a MADS transcription factor involved in floral organ development, was solved to 2.5 Å by x-ray crystallography. The structure shows a novel oligomerization interface formed by two alpha helices oriented approximately 90° apart. Dimerization occurs through interactions of helix 1, and tetramerization occurs through interactions of helix 2.

  • Resolving Distinct Genetic Regulators of Tomato Leaf Shape within a Heteroblastic and Ontogenetic Context
    Open Access
    Resolving Distinct Genetic Regulators of Tomato Leaf Shape within a Heteroblastic and Ontogenetic Context
    Daniel H. Chitwood, Aashish Ranjan, Ravi Kumar, Yasunori Ichihashi, Kristina Zumstein, Lauren R. Headland, Enrique Ostria-Gallardo, José A. Aguilar-Martínez, Susan Bush, Leonela Carriedo, Daniel Fulop, Ciera C. Martinez, Jie Peng, Julin N. Maloof, Neelima R. Sinha
    Plant Cell Sep 2014, 26 (9) 3616-3629; DOI: https://doi.org/10.1105/tpc.114.130112

    Leaf shape is dynamic and influenced by numerous factors. Here, the authors quantify shape differences in leaves across the leaf series and during their development, determining their genetic basis and the effects of environment, in a population resulting from a cross between tomato and a wild desert relative.

  • <em>Arabidopsis</em> DE-ETIOLATED1 Represses Photomorphogenesis by Positively Regulating Phytochrome-Interacting Factors in the Dark
    You have accessRestricted Access
    Arabidopsis DE-ETIOLATED1 Represses Photomorphogenesis by Positively Regulating Phytochrome-Interacting Factors in the Dark
    Jie Dong, Dafang Tang, Zhaoxu Gao, Renbo Yu, Kunlun Li, Hang He, William Terzaghi, Xing Wang Deng, Haodong Chen
    Plant Cell Sep 2014, 26 (9) 3630-3645; DOI: https://doi.org/10.1105/tpc.114.130666

    Light is a critically important environmental signal regulating plant development, and several repressors have been identified that can inhibit plant photomorphogenesis in the dark. This study reveals a possible mechanism by which two groups of repressors, COP/DET/FUS and PIFs, work in concert to repress photomorphogenesis in darkness.

  • The Light-Harvesting Chlorophyll <em>a</em>/<em>b</em> Binding Proteins Lhcb1 and Lhcb2 Play Complementary Roles during State Transitions in <em>Arabidopsis</em>
    Open Access
    The Light-Harvesting Chlorophyll a/b Binding Proteins Lhcb1 and Lhcb2 Play Complementary Roles during State Transitions in Arabidopsis
    Malgorzata Pietrzykowska, Marjaana Suorsa, Dmitry A. Semchonok, Mikko Tikkanen, Egbert J. Boekema, Eva-Mari Aro, Stefan Jansson
    Plant Cell Sep 2014, 26 (9) 3646-3660; DOI: https://doi.org/10.1105/tpc.114.127373

    Arabidopsis lines lacking either light-harvesting complex (LHC) protein Lhcb1 or Lhcb2 were produced, revealing that Lhcb1 and Lhcb2 play different roles during state transitions and that both are necessary but neither is sufficient. Plant lacking Lhcb1 lacked most LHCII trimers but plants lacking Lhcb2 contained LHCII similar to the wild type but could not perform state transitions.

  • The Small Regulatory RNA SyR1/PsrR1 Controls Photosynthetic Functions in Cyanobacteria
    You have accessRestricted Access
    The Small Regulatory RNA SyR1/PsrR1 Controls Photosynthetic Functions in Cyanobacteria
    Jens Georg, Dennis Dienst, Nils Schürgers, Thomas Wallner, Dominik Kopp, Damir Stazic, Ekaterina Kuchmina, Stephan Klähn, Heiko Lokstein, Wolfgang R. Hess, Annegret Wilde
    Plant Cell Sep 2014, 26 (9) 3661-3679; DOI: https://doi.org/10.1105/tpc.114.129767

    This work describes the role of a small noncoding RNA in the regulation of photosynthetic gene expression in cyanobacteria. Advanced computational target prediction combined with extensive experimental data reveal the photosynthesis regulatory RNA 1 as a key modulator of photosynthetic functions upon high-light exposure.

  • <em>Arabidopsis thaliana</em> RNase H2 Deficiency Counteracts the Needs for the WEE1 Checkpoint Kinase but Triggers Genome Instability
    You have accessRestricted Access
    Arabidopsis thaliana RNase H2 Deficiency Counteracts the Needs for the WEE1 Checkpoint Kinase but Triggers Genome Instability
    Pooneh Kalhorzadeh, Zhubing Hu, Toon Cools, Simon Amiard, Eva-Maria Willing, Nancy De Winne, Kris Gevaert, Geert De Jaeger, Korbinian Schneeberger, Charles I. White, Lieven De Veylder
    Plant Cell Sep 2014, 26 (9) 3680-3692; DOI: https://doi.org/10.1105/tpc.114.128108

    Absence of the RNAse H2 complex, mediating the excision of ribonucleotides from DNA, was found to overcome the growth inhibitory phenotype of plants lacking a functional replication checkpoint because of tolerating the substitution of deoxynucleotides with ribonucleotides. This substitution, however, results in replication errors, demonstrating the need of RNase H2 activity for genome stability.

  • How Vacuolar Sorting Receptor Proteins Interact with Their Cargo Proteins: Crystal Structures of Apo and Cargo-Bound Forms of the Protease-Associated Domain from an <em>Arabidopsis</em> Vacuolar Sorting Receptor
    You have accessRestricted Access
    How Vacuolar Sorting Receptor Proteins Interact with Their Cargo Proteins: Crystal Structures of Apo and Cargo-Bound Forms of the Protease-Associated Domain from an Arabidopsis Vacuolar Sorting Receptor
    Fang Luo, Yu Hang Fong, Yonglun Zeng, Jinbo Shen, Liwen Jiang, Kam-Bo Wong
    Plant Cell Sep 2014, 26 (9) 3693-3708; DOI: https://doi.org/10.1105/tpc.114.129940

    This work explores how vacuolar sorting receptor (VSR) recognizes sequence-specific information on cargo proteins for targeting to the vacuole. Elucidation of the structures of the protease-associated domain of a VSR with and without its cognate cargo peptide, along with mutagenesis and functional studies, provides insights into how VSR recognizes its cargo proteins.

  • Structural Studies of Cinnamoyl-CoA Reductase and Cinnamyl-Alcohol Dehydrogenase, Key Enzymes of Monolignol Biosynthesis
    You have accessRestricted Access
    Structural Studies of Cinnamoyl-CoA Reductase and Cinnamyl-Alcohol Dehydrogenase, Key Enzymes of Monolignol Biosynthesis
    Haiyun Pan, Rui Zhou, Gordon V. Louie, Joëlle K. Mühlemann, Erin K. Bomati, Marianne E. Bowman, Natalia Dudareva, Richard A. Dixon, Joseph P. Noel, Xiaoqiang Wang
    Plant Cell Sep 2014, 26 (9) 3709-3727; DOI: https://doi.org/10.1105/tpc.114.127399

    The enzymes cinnamoyl-CoA reductase and cinnamyl-alcohol dehydrogenase participate in the generation of building blocks for plant lignin-polymers. Their structures reported here shed light on the mechanisms of enzyme activity and regulation and on the determinants of substrate specificity. These findings may ultimately aid in the rational engineering of lignin composition in plants.

  • Spatio-Temporal Dynamics of Fructan Metabolism in Developing Barley Grains
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    Spatio-Temporal Dynamics of Fructan Metabolism in Developing Barley Grains
    Manuela Peukert, Johannes Thiel, Darin Peshev, Winfriede Weschke, Wim Van den Ende, Hans-Peter Mock, Andrea Matros
    Plant Cell Sep 2014, 26 (9) 3728-3744; DOI: https://doi.org/10.1105/tpc.114.130211

    Fructan metabolism in barley grains is developmental stage and tissue specific. Levans/graminans accumulate in the cellularized endosperm at the prestorage phase, while inulins are enriched in the transfer tissues around the endosperm cavity at the storage phase. This tight partitioning suggests that different fructans have distinct functions in various tissues during barley grain development.

  • A Root-Expressed <span class="sc">l</span>-Phenylalanine:4-Hydroxyphenylpyruvate Aminotransferase Is Required for Tropane Alkaloid Biosynthesis in <em>Atropa belladonna</em>
    You have accessRestricted Access
    A Root-Expressed l-Phenylalanine:4-Hydroxyphenylpyruvate Aminotransferase Is Required for Tropane Alkaloid Biosynthesis in Atropa belladonna
    Matthew A. Bedewitz, Elsa Góngora-Castillo, Joseph B. Uebler, Eliana Gonzales-Vigil, Krystle E. Wiegert-Rininger, Kevin L. Childs, John P. Hamilton, Brieanne Vaillancourt, Yun-Soo Yeo, Joseph Chappell, Dean DellaPenna, A. Daniel Jones, C. Robin Buell, Cornelius S. Barry
    Plant Cell Sep 2014, 26 (9) 3745-3762; DOI: https://doi.org/10.1105/tpc.114.130534

    This work helps uncover the biosynthetic pathway of the medicinally important tropane alkaloids in Deadly Nightshade. Transcriptomics, silencing, and biochemical analysis reveal the phylogenetically distinct, root-specific aromatic amino acid aminotransferase Ab-ArAT4, which preferentially catalyzes the first step in the formation of littorine, a key intermediate in tropane alkaloid biosynthesis.

  • Sterol Side Chain Reductase 2 Is a Key Enzyme in the Biosynthesis of Cholesterol, the Common Precursor of Toxic Steroidal Glycoalkaloids in Potato
    Open Access
    Sterol Side Chain Reductase 2 Is a Key Enzyme in the Biosynthesis of Cholesterol, the Common Precursor of Toxic Steroidal Glycoalkaloids in Potato
    Satoru Sawai, Kiyoshi Ohyama, Shuhei Yasumoto, Hikaru Seki, Tetsushi Sakuma, Takashi Yamamoto, Yumiko Takebayashi, Mikiko Kojima, Hitoshi Sakakibara, Toshio Aoki, Toshiya Muranaka, Kazuki Saito, Naoyuki Umemoto
    Plant Cell Sep 2014, 26 (9) 3763-3774; DOI: https://doi.org/10.1105/tpc.114.130096

    This work elucidates the biosynthetic pathway of toxic steroidal glycoalkaloids (SGAs) in potato, revealing that sterol side chain reductase 2 (SSR2) functions as a key enzyme in the biosynthesis of cholesterol and related SGAs. Silencing or disrupting SSR2 yielded potatoes with significantly reduced cholesterol and SGA levels but normal plant growth, making SSR2 an excellent target for breeding.

  • Phenylcoumaran Benzylic Ether Reductase Prevents Accumulation of Compounds Formed under Oxidative Conditions in Poplar Xylem
    You have accessRestricted Access
    Phenylcoumaran Benzylic Ether Reductase Prevents Accumulation of Compounds Formed under Oxidative Conditions in Poplar Xylem
    Claudiu Niculaes, Kris Morreel, Hoon Kim, Fachuang Lu, Lauren S. McKee, Bart Ivens, Jurgen Haustraete, Bartel Vanholme, Riet De Rycke, Magnus Hertzberg, Jorg Fromm, Vincent Bulone, Andrea Polle, John Ralph, Wout Boerjan
    Plant Cell Sep 2014, 26 (9) 3775-3791; DOI: https://doi.org/10.1105/tpc.114.125260

    This work reveals the biological function of phenylcoumaran benzylic ether reductase, one of the most abundant proteins in poplar wood. Its role is to reduce monolignol coupling products and to prevent accumulation of compounds formed under oxidative conditions.

  • Multiple <em>N</em>-Glycans Cooperate in the Subcellular Targeting and Functioning of <em>Arabidopsis</em> KORRIGAN1
    You have accessRestricted Access
    Multiple N-Glycans Cooperate in the Subcellular Targeting and Functioning of Arabidopsis KORRIGAN1
    Stephan Rips, Nolan Bentley, In Sil Jeong, Justin L. Welch, Antje von Schaewen, Hisashi Koiwa
    Plant Cell Sep 2014, 26 (9) 3792-3808; DOI: https://doi.org/10.1105/tpc.114.129718

    Arabidopsis KORRIGAN1 is a membrane protein with a heavily N-glycosylated extracellular domain. Conserved N-glycosylation sites support the trans-Golgi network localization and in vivo function of KORRIGAN1 at the plasma membrane. The host cell’s capacity to produce complex N-glycans affects KORRIGAN1 function in trans.

  • Adjustment of Host Cells for Accommodation of Symbiotic Bacteria: Vacuole Defunctionalization, HOPS Suppression, and TIP1g Retargeting in <em>Medicago</em>
    Open Access
    Adjustment of Host Cells for Accommodation of Symbiotic Bacteria: Vacuole Defunctionalization, HOPS Suppression, and TIP1g Retargeting in Medicago
    Aleksandr Gavrin, Brent N. Kaiser, Dietmar Geiger, Stephen D. Tyerman, Zhengyu Wen, Ton Bisseling, Elena E. Fedorova
    Plant Cell Sep 2014, 26 (9) 3809-3822; DOI: https://doi.org/10.1105/tpc.114.128736

    The accommodation of thousands of nitrogen-fixing rhizobia in legume root nodules requires changes in functionality of the vacuoles of infected cells. Suppression of HOPS tethering complex genes and tonoplast aquaporin retargeting to symbiosomes is part of the underlying mechanism. Defunctionalization of host vacuoles contributes to the expansion and maintenance of intracellular rhizobia.

CORRECTION

  • You have accessRestricted Access
    Correction
    Plant Cell Sep 2014, 26 (9) 3823; DOI: https://doi.org/10.1105/tpc.114.132498

TEACHING TOOLS IN PLANT BIOLOGY

  • Plant Nutrition 1: Membrane Transport and Energetics, Potassium Nutrition, and Sodium Toxicity
    You have accessRestricted Access
    Plant Nutrition 1: Membrane Transport and Energetics, Potassium Nutrition, and Sodium Toxicity
    Plant Cell Sep 2014, 26 (9) tpc.114.tt0914; DOI: https://doi.org/10.1105/tpc.114.tt0914
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The Plant Cell Online: 26 (9)
The Plant Cell
Vol. 26, Issue 9
Sep 2014
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