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Table of Contents

The Plant Cell Online: 23 (4)
Apr 2011

IN BRIEF

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    A Biophysical Model for Predicting Regulatory Interactions
    Nancy R. Hofmann
    Plant Cell Apr 2011, 23 (4) 1187; DOI: https://doi.org/10.1105/tpc.111.230410
  • You have accessRestricted Access
    Global Analysis of Copper Responsiveness in Chlamydomonas
    Gregory Bertoni
    Plant Cell Apr 2011, 23 (4) 1188; DOI: https://doi.org/10.1105/tpc.111.230411
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    Fine-Tuning Photosynthesis: Structural Basis of Photoprotective Energy Dissipation
    Nancy A. Eckardt
    Plant Cell Apr 2011, 23 (4) 1189; DOI: https://doi.org/10.1105/tpc.111.230412
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    Induction of Phytoalexin Biosynthesis: WRKY33 Is a Target of MAPK Signaling
    Nancy A. Eckardt
    Plant Cell Apr 2011, 23 (4) 1190; DOI: https://doi.org/10.1105/tpc.111.230413

LETTER TO THE EDITOR

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    In Plant and Animal Cells, Detergent-Resistant Membranes Do Not Define Functional Membrane Rafts
    Widmar Tanner, Jan Malinsky, Miroslava Opekarová
    Plant Cell Apr 2011, 23 (4) 1191-1193; DOI: https://doi.org/10.1105/tpc.111.086249

PERSPECTIVES

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    Charles Darwin and the Origins of Plant Evolutionary Developmental Biology
    William E. Friedman, Pamela K. Diggle
    Plant Cell Apr 2011, 23 (4) 1194-1207; DOI: https://doi.org/10.1105/tpc.111.084244
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    RAC/ROP GTPases and Auxin Signaling
    Hen-ming Wu, Ora Hazak, Alice Y. Cheung, Shaul Yalovsky
    Plant Cell Apr 2011, 23 (4) 1208-1218; DOI: https://doi.org/10.1105/tpc.111.083907

REVIEW

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    Brassinosteroid Signal Transduction: From Receptor Kinase Activation to Transcriptional Networks Regulating Plant Development
    Steven D. Clouse
    Plant Cell Apr 2011, 23 (4) 1219-1230; DOI: https://doi.org/10.1105/tpc.111.084475

LARGE-SCALE BIOLOGY ARTICLES

  • Open Access
    A Sister Group Contrast Using Untargeted Global Metabolomic Analysis Delineates the Biochemical Regulation Underlying Desiccation Tolerance in Sporobolus stapfianus
    Melvin J. Oliver, Lining Guo, Danny C. Alexander, John A. Ryals, Bernard W.M. Wone, John C. Cushman
    Plant Cell Apr 2011, 23 (4) 1231-1248; DOI: https://doi.org/10.1105/tpc.110.082800

    The desiccation-tolerant Sporobolus stapfianus and desiccation-sensitive Sporobolus pyramidalis form a sister group contrast to investigate adaptive metabolic responses to dehydration using untargeted global metabolomic analysis. The metabolic profiles obtained reveal a state of preparedness and a cascade of biochemical regulation strategies critical to the survival of S. stapfianus under desiccation.

  • Open Access
    Unlocking the Barley Genome by Chromosomal and Comparative Genomics
    Klaus F.X. Mayer, Mihaela Martis, Pete E. Hedley, Hana Šimková, Hui Liu, Jenny A. Morris, Burkhard Steuernagel, Stefan Taudien, Stephan Roessner, Heidrun Gundlach, Marie Kubaláková, Pavla Suchánková, Florent Murat, Marius Felder, Thomas Nussbaumer, Andreas Graner, Jerome Salse, Takashi Endo, Hiroaki Sakai, Tsuyoshi Tanaka, Takeshi Itoh, Kazuhiro Sato, Matthias Platzer, Takashi Matsumoto, Uwe Scholz, Jaroslav Doležel, Robbie Waugh, Nils Stein
    Plant Cell Apr 2011, 23 (4) 1249-1263; DOI: https://doi.org/10.1105/tpc.110.082537

    Survey sequence and array hybridization data from flow-sorted barley chromosomes were integrated using a comparative genomics model to define an ordered gene map of the barley genome that contains approximately two-thirds of its estimated 32000 genes. The resulting high-resolution framework facilitated a genome-wide structural analysis of the barley genome and a detailed comparative analysis with wheat.

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    Coordinated Gene Networks Regulating Arabidopsis Plant Metabolism in Response to Various Stresses and Nutritional Cues
    Hadar Less, Ruthie Angelovici, Vered Tzin, Gad Galili
    Plant Cell Apr 2011, 23 (4) 1264-1271; DOI: https://doi.org/10.1105/tpc.110.082867

    This work introduces a bioinformatics approach that identifies positive and negative coordination of gene expression between sets of genes, or entire gene networks, in response to environmental or developmental cues. The approach is illustrated by a case study that identifies distinct expression behavior of the energy-associated gene network in response to different biotic and abiotic stresses.

RESEARCH ARTICLES

  • Open Access
    Systems Biology Approach in Chlamydomonas Reveals Connections between Copper Nutrition and Multiple Metabolic Steps
    Madeli Castruita, David Casero, Steven J. Karpowicz, Janette Kropat, Astrid Vieler, Scott I. Hsieh, Weihong Yan, Shawn Cokus, Joseph A. Loo, Christoph Benning, Matteo Pellegrini, Sabeeha S. Merchant
    Plant Cell Apr 2011, 23 (4) 1273-1292; DOI: https://doi.org/10.1105/tpc.111.084400

    RNA-seq assessment of the transcriptome of autotrophic and heterotrophic Chlamydomonas as a function of copper nutrition reveals changes in redox metabolism regulated by CRR1, an SBP domain transcription factor. The changes in RNA abundance impact the abundance of specific plastid-localized proteins and the level of saturation of plastid galactolipids.

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    Prediction of Regulatory Interactions from Genome Sequences Using a Biophysical Model for the Arabidopsis LEAFY Transcription Factor
    Edwige Moyroud, Eugenio Gómez Minguet, Felix Ott, Levi Yant, David Posé, Marie Monniaux, Sandrine Blanchet, Olivier Bastien, Emmanuel Thévenon, Detlef Weigel, Markus Schmid, François Parcy
    Plant Cell Apr 2011, 23 (4) 1293-1306; DOI: https://doi.org/10.1105/tpc.111.083329

    This work presents the generation of a predictive model describing the DNA recognition specificity of the LEAFY floral transcription factor. The model is used to predict in vivo regulatory interactions between LEAFY and its target genes from mere inspection of various plant genome sequences.

  • Open Access
    Aa TFL1 Confers an Age-Dependent Response to Vernalization in Perennial Arabis alpina
    Renhou Wang, Maria C. Albani, Coral Vincent, Sara Bergonzi, Ming Luan, Yan Bai, Christiane Kiefer, Rosa Castillo, George Coupland
    Plant Cell Apr 2011, 23 (4) 1307-1321; DOI: https://doi.org/10.1105/tpc.111.083451

    Many plants must reach a certain age before they will flower in response to environmental cues. Perennial Arabis alpina plants are shown not to respond to vernalization until they are 5 weeks old. This effect is found to require the Aa TFL1 gene, which blocks induction of Aa LFY when young plants are exposed to cold.

  • Open Access
    Mobile Gibberellin Directly Stimulates Arabidopsis Hypocotyl Xylem Expansion
    Laura Ragni, Kaisa Nieminen, David Pacheco-Villalobos, Richard Sibout, Claus Schwechheimer, Christian S. Hardtke
    Plant Cell Apr 2011, 23 (4) 1322-1336; DOI: https://doi.org/10.1105/tpc.111.084020

    In this study, the authors find that the expansion of the xylem in Arabidopsis hypocotyls observed upon flowering is directly triggered by signaling through the plant hormone gibberellin. The authors also demonstrate that this involves mobile gibberellin, which therefore can act as a long-distance signal.

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    A DELLA in Disguise: SPATULA Restrains the Growth of the Developing Arabidopsis Seedling
    Eve-Marie Josse, Yinbo Gan, Jordi Bou-Torrent, Kelly L. Stewart, Alison D. Gilday, Christopher E. Jeffree, Fabián E. Vaistij, Jaime F. Martínez-García, Ferenc Nagy, Ian A. Graham, Karen J. Halliday
    Plant Cell Apr 2011, 23 (4) 1337-1351; DOI: https://doi.org/10.1105/tpc.110.082594

    This study examines the role of the PHYTOCHROME INTERACTING FACTOR3 homolog SPATULA (SPT) in the control of the developing seedling and shows that SPT is a potent regulator of cotyledon size, acting in parallel to DELLAs. As DELLAs negatively regulate SPT abundance, the light regulation of DELLAs drives the DELLA-SPT counterbalance, enforcing growth restraint across a range of ambient light conditions that are prevalent in nature.

  • Open Access
    d-myo-Inositol-3-Phosphate Affects Phosphatidylinositol-Mediated Endomembrane Function in Arabidopsis and Is Essential for Auxin-Regulated Embryogenesis
    Yu Luo, Genji Qin, Jun Zhang, Yuan Liang, Yingqi Song, Meiping Zhao, Tomohiko Tsuge, Takashi Aoyama, Jingjing Liu, Hongya Gu, Li-Jia Qu
    Plant Cell Apr 2011, 23 (4) 1352-1372; DOI: https://doi.org/10.1105/tpc.111.083337

    This work reveals the significant roles of myo-inositol in Arabidopsis embryogenesis. Experiments show that depletion of myo-inositol by knocking out multiple MIPS genes, which encode d-myo-inositol-3-phosphate synthase, could affect the membrane trafficking via the phosphatidylinositol metabolism by leading to altered auxin distribution in developing embryos.

  • Open Access
    The Interconversion of UDP-Arabinopyranose and UDP-Arabinofuranose Is Indispensable for Plant Development in Arabidopsis
    Carsten Rautengarten, Berit Ebert, Thomas Herter, Christopher J. Petzold, Tadashi Ishii, Aindrila Mukhopadhyay, Björn Usadel, Henrik Vibe Scheller
    Plant Cell Apr 2011, 23 (4) 1373-1390; DOI: https://doi.org/10.1105/tpc.111.083931

    Incorporation of arabinose into plant cell wall polysaccharides requires conversion into the furanose form. This conversion is mediated exclusively by UDP-arabinose mutases (RGPs) located in the cytoplasm.

  • Open Access
    β-Amylase–Like Proteins Function as Transcription Factors in Arabidopsis, Controlling Shoot Growth and Development
    Heike Reinhold, Sebastian Soyk, Klára Šimková, Carmen Hostettler, John Marafino, Samantha Mainiero, Cara K. Vaughan, Jonathan D. Monroe, Samuel C. Zeeman
    Plant Cell Apr 2011, 23 (4) 1391-1403; DOI: https://doi.org/10.1105/tpc.110.081950

    Two proteins similar to β-amylases (enzymes usually associated with starch breakdown) possess a BZR1-type DNA binding domain and are nuclear localized. They bind a G box-containing motif and regulate the expression of genes, many of which also respond to brassinosteroids, to influence shoot growth. Similar proteins occur in other plants, implying functional conservation.

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    ABI3 and PIL5 Collaboratively Activate the Expression of SOMNUS by Directly Binding to Its Promoter in Imbibed Arabidopsis Seeds
    Jeongmoo Park, Nayoung Lee, Woohyun Kim, Soohwan Lim, Giltsu Choi
    Plant Cell Apr 2011, 23 (4) 1404-1415; DOI: https://doi.org/10.1105/tpc.110.080721

    This study examines the regulation of SOMNUS (SOM), which is a key negative regulator of seed germination. ABI3 was found to regulate SOM expression together with PIL5, a previously identified regulator of SOM. PIL5 and ABI3, which interact to form a complex, regulate SOM expression independently in maturing seeds, but collaboratively in imbibed seeds.

  • Open Access
    Rice APOPTOSIS INHIBITOR5 Coupled with Two DEAD-Box Adenosine 5′-Triphosphate-Dependent RNA Helicases Regulates Tapetum Degeneration
    Xingwang Li, Xinqiang Gao, Yi Wei, Li Deng, Yidan Ouyang, Guoxing Chen, Xianghua Li, Qifa Zhang, Changyin Wu
    Plant Cell Apr 2011, 23 (4) 1416-1434; DOI: https://doi.org/10.1105/tpc.110.082636

    This study examines the role of API5, a homolog of animal antiapoptosis proteins, in the degeneration of the tapetum during the formation of male gametophytes in rice. It describes a previously unknown pathway for regulating programmed cell death, one that may be conserved among eukaryotic organisms.

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    The Arabidopsis thaliana Checkpoint Kinase WEE1 Protects against Premature Vascular Differentiation during Replication Stress
    Toon Cools, Anelia Iantcheva, Annika K. Weimer, Shannah Boens, Naoki Takahashi, Sara Maes, Hilde Van den Daele, Gert Van Isterdael, Arp Schnittger, Lieven De Veylder
    Plant Cell Apr 2011, 23 (4) 1435-1448; DOI: https://doi.org/10.1105/tpc.110.082768

    Because of their sessile lifestyle, plants need to react promptly to factors that affect meristem integrity. This work shows that the WEE1 checkpoint kinase maintains the root meristem activity under replication stress by controlling S-phase progression, thereby preventing premature onset of vascular cell differentiation.

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    GUN4-Porphyrin Complexes Bind the ChlH/GUN5 Subunit of Mg-Chelatase and Promote Chlorophyll Biosynthesis in Arabidopsis
    Neil D. Adhikari, John E. Froehlich, Deserah D. Strand, Stephanie M. Buck, David M. Kramer, Robert M. Larkin
    Plant Cell Apr 2011, 23 (4) 1449-1467; DOI: https://doi.org/10.1105/tpc.110.082503

    We show that GUN4-porphyrin complexes help to channel protoporphyrin IX into chlorophyll biosynthesis by binding to the ChlH subunit of Mg-chelatase with a higher affinity than unliganded GUN4 on Arabidopsis chloroplast membranes. GUN4 and ChlH used distinct mechanisms to associate with chloroplast membranes, and mutant alleles of GUN4 and Mg-chelatase subunit genes cause sensitivity to intense light.

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    Photoprotective Energy Dissipation Involves the Reorganization of Photosystem II Light-Harvesting Complexes in the Grana Membranes of Spinach Chloroplasts
    Matthew P. Johnson, Tomasz K. Goral, Christopher D.P. Duffy, Anthony P.R. Brain, Conrad W. Mullineaux, Alexander V. Ruban
    Plant Cell Apr 2011, 23 (4) 1468-1479; DOI: https://doi.org/10.1105/tpc.110.081646

    The rapidly reversible macrostructural changes in higher-plant chloroplast thylakoid membrane organization accompanying photoprotective energy dissipation (qE) are studied using freeze-fracture electron and laser confocal microscopy. qE is shown to involve the aggregation of light-harvesting complexes and their segregation from photosystem II.

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    An Src Homology 3 Domain-Like Fold Protein Forms a Ferredoxin Binding Site for the Chloroplast NADH Dehydrogenase-Like Complex in Arabidopsis
    Hiroshi Yamamoto, Lianwei Peng, Yoichiro Fukao, Toshiharu Shikanai
    Plant Cell Apr 2011, 23 (4) 1480-1493; DOI: https://doi.org/10.1105/tpc.110.080291

    Chloroplast NAD(P)H dehydrogenase (NDH) has been thought to function as an NAD(P)H:plastoquinone oxidoreductase in cyclic electron transport around photosystem I, although its electron donor binding site was unclear. This study indicates that CRR31, a novel NDH subunit, serves in the high-affinity binding of ferredoxin to NDH and proposes that chloroplast NDH is ferredoxin:plastoquinone oxidoreductase.

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    Multilevel Control of Arabidopsis 3-Hydroxy-3-Methylglutaryl Coenzyme A Reductase by Protein Phosphatase 2A
    Pablo Leivar, Meritxell Antolín-Llovera, Sergi Ferrero, Marta Closa, Montserrat Arró, Albert Ferrer, Albert Boronat, Narciso Campos
    Plant Cell Apr 2011, 23 (4) 1494-1511; DOI: https://doi.org/10.1105/tpc.110.074278

    HMG-CoA reductase has a key role in the regulation of the mevalonate pathway for isoprenoid biosynthesis and is modulated by many diverse endogenous and environmental stimuli. In this work, protein phosphatase 2A emerges as a positive and negative multilevel regulator of plant HMG-CoA reductase during normal development and in response to a variety of stress conditions.

  • Open Access
    Negative Regulation of Anthocyanin Biosynthesis in Arabidopsis by a miR156-Targeted SPL Transcription Factor
    Jin-Ying Gou, Felipe F. Felippes, Chang-Jun Liu, Detlef Weigel, Jia-Wei Wang
    Plant Cell Apr 2011, 23 (4) 1512-1522; DOI: https://doi.org/10.1105/tpc.111.084525

    This work reveals that anthocyanin biosynthesis is coupled to floral transition by miR156-targeted SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) genes. SPL negatively regulates anthocyanin accumulation by directly preventing expression of anthocyanin biosynthetic genes through destabilization of a MYB-bHLH-WD40 transcriptional activation complex.

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    Arabidopsis thaliana High-Affinity Phosphate Transporters Exhibit Multiple Levels of Posttranslational Regulation
    Vincent Bayle, Jean-François Arrighi, Audrey Creff, Claude Nespoulous, Jérôme Vialaret, Michel Rossignol, Esperanza Gonzalez, Javier Paz-Ares, Laurent Nussaume
    Plant Cell Apr 2011, 23 (4) 1523-1535; DOI: https://doi.org/10.1105/tpc.110.081067

    In Arabidopsis, the PHOSPHATE TRANSPORTER1 (PHT1) family encodes the high affinity phosphate transporters. This analysis revealed multiple steps of regulation in various cell compartments modulating the level of PHT1 proteins present in the plasma membrane in response to the level of inorganic phosphate.

  • Open Access
    MATE2 Mediates Vacuolar Sequestration of Flavonoid Glycosides and Glycoside Malonates in Medicago truncatula
    Jian Zhao, David Huhman, Gail Shadle, Xian-Zhi He, Lloyd W. Sumner, Yuhong Tang, Richard A. Dixon
    Plant Cell Apr 2011, 23 (4) 1536-1555; DOI: https://doi.org/10.1105/tpc.110.080804

    This work identifies MATE2, which transports glycosylated flavonoids into the vacuole, showing higher transport efficiency with anthocyanins than other flavonoid glycosides, and an increase in transport efficiency for malonylated flavonoid glucosides. Null mutants of MATE2 show decreases of anthocyanins and increases in other flavonoids, such as seed proanthocyanidin.

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    Identification of Novel Plant Peroxisomal Targeting Signals by a Combination of Machine Learning Methods and in Vivo Subcellular Targeting Analyses
    Thomas Lingner, Amr R. Kataya, Gerardo E. Antonicelli, Aline Benichou, Kjersti Nilssen, Xiong-Yan Chen, Tanja Siemsen, Burkhard Morgenstern, Peter Meinicke, Sigrun Reumann
    Plant Cell Apr 2011, 23 (4) 1556-1572; DOI: https://doi.org/10.1105/tpc.111.084095

    Two different prediction methods for Arabidopsis proteins carrying peroxisome targeting signals type 1 (PTS1) are described. Validation of many novel targeting signals and Arabidopsis PTS1 proteins by in vivo localization experiments demonstrates a high prediction accuracy of the new methods.

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    Arabidopsis ABERRANT PEROXISOME MORPHOLOGY9 Is a Peroxin That Recruits the PEX1-PEX6 Complex to Peroxisomes
    Shino Goto, Shoji Mano, Chihiro Nakamori, Mikio Nishimura
    Plant Cell Apr 2011, 23 (4) 1573-1587; DOI: https://doi.org/10.1105/tpc.110.080770

    This study identifies APEM9 as an essential factor for peroxisomal protein transport in plants. APEM9 proteins have unique amino acid sequences, which are distinct from that of Pex26 functional homologs in mammals.

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    Both the Hydrophobicity and a Positively Charged Region Flanking the C-Terminal Region of the Transmembrane Domain of Signal-Anchored Proteins Play Critical Roles in Determining Their Targeting Specificity to the Endoplasmic Reticulum or Endosymbiotic Organelles in Arabidopsis Cells
    Junho Lee, Hyunkyung Lee, Jinho Kim, Sumin Lee, Dae Heon Kim, Sanguk Kim, Inhwan Hwang
    Plant Cell Apr 2011, 23 (4) 1588-1607; DOI: https://doi.org/10.1105/tpc.110.082230

    This study uses in vivo targeting, subcellular fractionation, and bioinformatics approaches to investigate the signal sequences that determine whether signal-anchored proteins are targeted to the endoplasmic reticulum or to endosymbiotic organelles.

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    A Conserved, Mg2+-Dependent Exonuclease Degrades Organelle DNA during Arabidopsis Pollen Development
    Ryo Matsushima, Lay Yin Tang, Lingang Zhang, Hiroshi Yamada, David Twell, Wataru Sakamoto
    Plant Cell Apr 2011, 23 (4) 1608-1624; DOI: https://doi.org/10.1105/tpc.111.084012

    Extrachromosomal DNAs, present in plastids and mitochondria, are present in multiple copies and appear to be degraded in the mature pollen of most angiosperm species. This study, by deciphering a tissue-specific organelle DNA degradation mechanism, identifies the organellar nuclease that degrades these extrachromosomal DNAs during Arabidopsis pollen development.

  • Open Access
    The 21-Nucleotide, but Not 22-Nucleotide, Viral Secondary Small Interfering RNAs Direct Potent Antiviral Defense by Two Cooperative Argonautes in Arabidopsis thaliana
    Xian-Bing Wang, Juan Jovel, Petchthai Udomporn, Ying Wang, Qingfa Wu, Wan-Xiang Li, Virginie Gasciolli, Herve Vaucheret, Shou-Wei Ding
    Plant Cell Apr 2011, 23 (4) 1625-1638; DOI: https://doi.org/10.1105/tpc.110.082305

    This work identifies cooperative action of ARGONAUTE1 and ARGONAUTE2 in virus resistance conferred by 21-nucleotide virus-derived small interfering RNAs (siRNAs). It also reveals that 22-nucleotide viral siRNAs do not guide efficient antiviral defense, demonstrating a qualitative difference between 21- and 22-nucleotide classes of siRNAs in RNA silencing.

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    Phosphorylation of a WRKY Transcription Factor by Two Pathogen-Responsive MAPKs Drives Phytoalexin Biosynthesis in Arabidopsis
    Guohong Mao, Xiangzong Meng, Yidong Liu, Zuyu Zheng, Zhixiang Chen, Shuqun Zhang
    Plant Cell Apr 2011, 23 (4) 1639-1653; DOI: https://doi.org/10.1105/tpc.111.084996

    WRKY33 functions downstream of pathogen-responsive MPK3 and MPK6 in reprogramming the expression of camalexin biosynthetic genes; this drives the metabolic flow to camalexin production in Arabidopsis challenged by pathogens. Biochemical and genetic analyses demonstrate that the phosphorylation of WRKY33 by MPK3/MPK6 plays an important role in the process.

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    The DNA Damage Response Signaling Cascade Regulates Proliferation of the Phytopathogenic Fungus Ustilago maydis in Planta
    Carmen de Sena-Tomás, Alfonso Fernández-Álvarez, William K. Holloman, José Pérez-Martín
    Plant Cell Apr 2011, 23 (4) 1654-1665; DOI: https://doi.org/10.1105/tpc.110.082552

    This work shows that in the phytopathogenic fungus Ustilago maydis, the genetic pathway involved in the transmission of signals required for the response to DNA damage is also used to control the specific dikaryotic cell cycle that predominates proliferation in planta.

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    ETOILE Regulates Developmental Patterning in the Filamentous Brown Alga Ectocarpus siliculosus
    Aude Le Bail, Bernard Billoud, Sophie Le Panse, Sabine Chenivesse, Bénédicte Charrier
    Plant Cell Apr 2011, 23 (4) 1666-1678; DOI: https://doi.org/10.1105/tpc.110.081919

    By means of a combination of experimental and modeling approaches applied to the hyperbranching mutant étoile, cell–cell communication, likely mediated by novel transmembrane proteins that share similarities with metazoan Notch receptors, was shown to account for the establishment of filament patterning and cell differentiation in the filamentous brown alga Ectocarpus siliculosus.

CORRECTION

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    Correction
    Plant Cell Apr 2011, 23 (4) 1679-1681; DOI: https://doi.org/10.1105/tpc.111.230460

Teaching Tools in Plant Biology

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    Strigolactones
    Plant Cell Apr 2011, 23 (4) tpc.111.tt0411; DOI: https://doi.org/10.1105/tpc.111.tt0411
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The Plant Cell Online: 23 (4)
The Plant Cell
Vol. 23, Issue 4
Apr 2011
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