IN THIS ISSUE:

Evolution of Compound Leaf Development in Legumes: Evidence for Overlapping Roles of KNOX1 and FLO/LFY Genes

Nancy A. Eckardt

Plant Cell 2007 19: 3315-3316.

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IN BRIEF:

Circadian Regulation of Cytosolic Ca²⁺

Nancy A. Eckardt

Plant Cell 2007 19: 3317.

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Gene Silencing and Resistance to Bacterial Pathogens

Nancy A. Eckardt

Plant Cell 2007 19: 3317.

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CURRENT PERSPECTIVE ESSAYS:

Insights from Sequencing Fungal and Oomycete Genomes: What Can We Learn about Plant Disease and the Evolution of Pathogenicity?

Darren M. Soanes, Thomas A. Richards, and Nicholas J. Talbot

Plant Cell 2007 19: 3318-3326. First Published on November 16, 2007; 10.1105/tpc.107.056663

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Network Inference, Analysis, and Modeling in Systems Biology

Réka Albert

Plant Cell 2007 19: 3327-3338. First Published on November 30, 2007; 10.1105/tpc.107.054700

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Quantitative Proteomics in Plants: Choices in Abundance

Jay J. Thelen and Scott C. Peck

Plant Cell 2007 19: 3339-3346. First Published on November 30, 2007; 10.1105/tpc.107.053991

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RESEARCH ARTICLES:

Dothideomycete–Plant Interactions Illuminated by Genome Sequencing and EST Analysis of the Wheat Pathogen Stagonospora nodorum James K. Hane, Rohan G.T. Lowe, Peter S. Solomon, Kar-Chun Tan, Conrad L. Schoch, Joseph W. Spatafora, Pedro W. Crous, Chinappa Kodira, Bruce W. Birren, James E. Galagan, Stefano F.F. Torriani, Bruce A. McDonald, and Richard P. Oliver Plant Cell 2007 19: 3347-3368. First Published on November 16, 2007; 10.1105/tpc.107.052829 Dothideomycetes is a large class of filamentous fungi containing many necrotrophic fungal pathogens. This work describes the genome sequence and extensive EST data of the wheat pathogen Stagonospora nodorum. Gene prediction analyses suggest a minimum of 10,762 nuclear genes contained in 38 Mbp and reveal gene families and enzymatic functions likely to be important in the host–parasite interaction. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Compound Leaf Development and Evolution in the Legumes

Connie E.M. Champagne, Thomas E. Goliber, Martin F. Wojciechowski, Raymond W. Mei, Brad T. Townsley, Kan Wang, Margie M. Paz, R. Geeta, and Neelima R. Sinha

Plant Cell 2007 19: 3369-3378. First Published on November 9, 2007; 10.1105/tpc.107.052886

Expression of KNOX1 genes in leaves is commonly associated with compound leaf development. The expression of KNOX1 genes was lost in the inverted repeat–lacking clade of legumes. In this clade, the FLORICAULA/LEAFY gene likely adopted a prominent role in establishing leaf complexity.

[Abstract] [Full Text] [PDF] [Supplemental Data]

A Feedback Regulatory Module Formed by LITTLE ZIPPER and HD-ZIPIII Genes Stephan Wenkel, John Emery, Bi-Huei Hou, Matthew M.S. Evans, and M.K. Barton Plant Cell 2007 19: 3379-3390. First Published on November 30, 2007; 10.1105/tpc.107.055772 Transcription of a family of small leucine zipper proteins, the LITTLE ZIPPERs (ZPRs), is induced by the REVOLUTA (REV) transcription factor. A model in which the ZPR protein feedback inhibits REV activity, thus promoting abaxial leaf development, is presented and experimentally supported. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Evolution and Function of a cis-Regulatory Module for Mesophyll-Specific Gene Expression in the C₄ Dicot Flaveria trinervia

Meryem Akyildiz, Udo Gowik, Sascha Engelmann, Maria Koczor, Monika Streubel, and Peter Westhoff

Plant Cell 2007 19: 3391-3402. First Published on November 9, 2007; 10.1105/tpc.107.053322

C₄ plants evolved several times independently from C₃ plants. C₄ photosynthesis requires cell-specific expression of the genes encoding the enzymes involved in this photosynthetic pathway. This work shows how a cis-regulatory motif, responsible for cell-specific expression of a C₄ ppc gene, evolved at the molecular level.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Genomic Changes in Resynthesized Brassica napus and Their Effect on Gene Expression and Phenotype Robert T. Gaeta, J. Chris Pires, Federico Iniguez-Luy, Enrique Leon, and Thomas C. Osborn Plant Cell 2007 19: 3403-3417. First Published on November 16, 2007; 10.1105/tpc.107.054346 Homoeologous chromosome rearrangements are a major mechanism contributing to changes in gene expression and phenotypic variation in newly resynthesized Brassica napus allopolyploids. These data suggest that homoeologous rearrangements are an important early evolutionary force in B. napus leading to rapid genetic and phenotypic divergence. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Genome-Wide Analysis of mRNA Decay Rates and Their Determinants in Arabidopsis thaliana

Reena Narsai, Katharine A. Howell, A. Harvey Millar, Nicholas O'Toole, Ian Small, and James Whelan

Plant Cell 2007 19: 3418-3436. First Published on November 16, 2007; 10.1105/tpc.107.055046

The decay rates of transcripts in Arabidopsis cells were found to be affected by several features of the transcript, revealing multilevel regulation of transcript stability. Similar changes in transcript abundance by transcriptional inhibition and various abiotic stresses revealed that inhibition of transcription could be a determinant of changes in transcript abundance during environmental stress.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Riboswitch Control of Gene Expression in Plants by Splicing and Alternative 3' End Processing of mRNAs Andreas Wachter, Meral Tunc-Ozdemir, Beth C. Grove, Pamela J. Green, David K. Shintani, and Ronald R. Breaker Plant Cell 2007 19: 3437-3450. First Published on November 9, 2007; 10.1105/tpc.107.053645 This work reveals that a thiamin pyrophosphate–sensing riboswitch is present in the 3' untranslated region of the thiamin biosynthetic gene THIC of many plant species and demonstrates that riboswitch-mediated regulation of alternative 3' end processing is critical for metabolite-dependent feedback control of THIC expression. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Arabidopsis FIERY1, XRN2, and XRN3 Are Endogenous RNA Silencing Suppressors

Isabelle Gy, Virginie Gasciolli, Dominique Lauressergues, Jean-Benoit Morel, Julie Gombert, Florence Proux, Caroline Proux, Hervé Vaucheret, and Allison C. Mallory

Plant Cell 2007 19: 3451-3461. First Published on November 9, 2007; 10.1105/tpc.107.055319

Posttranscriptional gene silencing (PTGS) is a eukaryotic defense mechanism against foreign invaders of the genome. This study identifies three proteins, XRN2, XRN3, and FRY1, as PTGS suppressors. FRY1 likely suppresses PTGS by regulating the XRNs, which in turn regulate the accumulation of RNAs that trigger PTGS. This work also points to the essential role of XRN3 during development.

[Abstract] [Full Text] [PDF] [Supplemental Data]

PRR3 Is a Vascular Regulator of TOC1 Stability in the Arabidopsis Circadian Clock Alessia Para, Eva M. Farré, Takato Imaizumi, José L. Pruneda-Paz, Franklin G. Harmon, and Steve A. Kay Plant Cell 2007 19: 3462-3473. First Published on November 30, 2007; 10.1105/tpc.107.054775 An oscillator that resonates with the diurnal cycle is crucial for optimal plant growth. Here, it is shown that the Arabidopsis regulator PRR3 protects the core clock component TOC1 from degradation. PRR3 expression and function appear more prominent in the vasculature, suggesting a mechanism that fine-tunes the plant clock in this tissue, a parallel to the well-known tissue-specific clocks of animals. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Distinct Light and Clock Modulation of Cytosolic Free Ca²⁺ Oscillations and Rhythmic CHLOROPHYLL A/B BINDING PROTEIN2 Promoter Activity in Arabidopsis

Xiaodong Xu, Carlos T. Hotta, Antony N. Dodd, John Love, Robert Sharrock, Young Wha Lee, Qiguang Xie, Carl H. Johnson, and Alex A.R. Webb

Plant Cell 2007 19: 3474-3490. First Published on November 2, 2007; 10.1105/tpc.106.046011

This study reports that the circadian regulation of cytosolic-free Ca²⁺ requires both light and a circadian oscillator. Genetic differences between the oscillator regulating Ca²⁺ and that regulating CAB2 promoter activity suggest the presence of multiple circadian oscillators in Arabidopsis, possibly with different molecular architectures and cellular locations.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Nitrate Signaling by the Regulatory Gene NIT2 in Chlamydomonas

Antonio Camargo, Ángel Llamas, Rogene A. Schnell, José J. Higuera, David González-Ballester, Paul A. Lefebvre, Emilio Fernández, and Aurora Galván

Plant Cell 2007 19: 3491-3503. First Published on November 16, 2007; 10.1105/tpc.106.045922

Chlamydomonas mutants incapable of growth on nitrate and lacking the ability to activate nitrate reductase (NIA1) gene expression were found to harbor mutations in the nitrate assimilation-specific regulatory gene NIT2. NIT2 was found to encode a putative transcription factor that is a central regulator required for nitrate-induced activation of NIA1 promoter activity.

[Abstract] [Full Text] [PDF] [Supplemental Data]

VPS9a, the Common Activator for Two Distinct Types of Rab5 GTPases, Is Essential for the Development of Arabidopsis thaliana

Tatsuaki Goh, Wakana Uchida, Satoko Arakawa, Emi Ito, Tomoko Dainobu, Kazuo Ebine, Masaki Takeuchi, Ken Sato, Takashi Ueda, and Akihiko Nakano

Plant Cell 2007 19: 3504-3515. First Published on November 30, 2007; 10.1105/tpc.107.053876

The activation of Rab GTPases must be regulated spatiotemporally, which is critical to fulfill their functions correctly. This study has identified an activating factor for Rab GTPases in Arabidopsis, named VPS9a, which equally activates all three Rab5 members of Arabidopsis. VPS9a was found to be essential for various plant functions, including embryogenesis, organ formation, and cytokinesis.

[Abstract] [Full Text] [PDF] [Supplemental Data]

The Homeotic Protein AGAMOUS Controls Late Stamen Development by Regulating a Jasmonate Biosynthetic Gene in Arabidopsis

Toshiro Ito, Kian-Hong Ng, Tze-Soo Lim, Hao Yu, and Elliot M. Meyerowitz

Plant Cell 2007 19: 3516-3529. First Published on November 2, 2007; 10.1105/tpc.107.055467

Timed activation of the floral homeotic gene AGAMOUS (AG) shows that AG has stage-specific functions throughout stamen development, including anther maturation and filament elongation in late stamen organogenesis. It is further shown that AG coordinates late stamen development through the direct transcriptional regulation of a catalytic enzyme of the lipid-derived phytohormone jasmonic acid.

[Abstract] [Full Text] [PDF] [Supplemental Data]

MALE STERILITY1 Is Required for Tapetal Development and Pollen Wall Biosynthesis Caiyun Yang, Gema Vizcay-Barrena, Katie Conner, and Zoe A. Wilson Plant Cell 2007 19: 3530-3548. First Published on November 21, 2007; 10.1105/tpc.107.054981 Expression of MALE STERILITY1 is tightly regulated, involving a self-regulatory feedback mechanism and transient MS1 protein expression, suggesting that its removal is required for pollen development. Genes associated with pollen wall and coat formation show altered expression in ms1, and a number of transcription factors and Cys proteases were identified as putative regulatory targets. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Arabidopsis MALE STERILITY1 Encodes a PHD-Type Transcription Factor and Regulates Pollen and Tapetum Development

Takuya Ito, Noriko Nagata, Yoshu Yoshiba, Masaru Ohme-Takagi, Hong Ma, and Kazuo Shinozaki

Plant Cell 2007 19: 3549-3562. First Published on November 21, 2007; 10.1105/tpc.107.054536

MS1 encodes a nuclear factor required for pollen development. Through the use of fusion with a transcriptional repression domain, it is shown that MS1 is a transcriptional activator. Putative direct target genes of MS1 are identified using a dexamethasone induction system. It is proposed that MS1 is involved in transcriptional regulation crucial for postmeiotic tapetum and pollen development.

[Abstract] [Full Text] [PDF] [Supplemental Data]

The Central Cell Plays a Critical Role in Pollen Tube Guidance in Arabidopsis

Yan-Hong Chen, Hong-Ju Li, Dong-Qiao Shi, Li Yuan, Jie Liu, Rajini Sreenivasan, Ramarmurthy Baskar, Ueli Grossniklaus, and Wei-Cai Yang

Plant Cell 2007 19: 3563-3577. First Published on November 30, 2007; 10.1105/tpc.107.053967

CENTRAL CELL GUIDANCE (CCG) is identified as a putative transcriptional regulator essential for pollen tube guidance. CCG encodes a nuclear protein with an N-terminal conserved zinc β-ribbon domain that is expressed in the central cell of the female gametophyte and plays a critical role in pollen tube guidance.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Cell-Fate Switch of Synergid to Egg Cell in Arabidopsis eostre Mutant Embryo Sacs Arises from Misexpression of the BEL1-Like Homeodomain Gene BLH1

Gabriela Carolina Pagnussat, Hee-Ju Yu, and Venkatesan Sundaresan

Plant Cell 2007 19: 3578-3592. First Published on November 30, 2007; 10.1105/tpc.107.054890

The female gametophyte mutant eostre is defective in the establishment of cell fates in the embryo sac, so that a synergid cell can acquire egg cell identity. This study indicates that these defects arise from ectopic activity of BELL-KNOX TALE complexes and that normal development of the Arabidopsis embryo sac requires suppression of their activity that might be mediated by OVATE family proteins.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Comparison of Petunia inflata S-Locus F-Box Protein (Pi SLF) with Pi SLF–Like Proteins Reveals Its Unique Function in S-RNase–Based Self-Incompatibility

Zhihua Hua, Xiaoying Meng, and Teh-hui Kao

Plant Cell 2007 19: 3593-3609. First Published on November 16, 2007; 10.1105/tpc.107.055426

Biochemical and in vivo studies of Pi SLF and Pi SLF–like proteins demonstrate that, among F-box proteins, Pi SLF has a unique function in controlling pollen behavior in self-incompatibility. These studies also identify a domain of Pi SLF responsible for strong interactions with non-self S-RNases and a potential allele-specific domain negatively regulating the interactions with self S-RNase.

[Abstract] [Full Text] [PDF] [Supplemental Data]

A Viroid RNA with a Specific Structural Motif Inhibits Chloroplast Development

Maria-Elena Rodio, Sonia Delgado, Angelo De Stradis, María-Dolores Gómez, Ricardo Flores, and Francesco Di Serio

Plant Cell 2007 19: 3610-3626. First Published on November 30, 2007; 10.1105/tpc.106.049775

A non-protein-coding viroid RNA with a specific structural motif interferes with an early step of chloroplast development, ultimately leading to an albino-variegated phenotype resembling that of certain variegated plant mutants in which plastid rRNA maturation is also impaired. These results highlight the potential of viroids for further dissection of RNA trafficking and pathogenesis in plants.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Synthesis of the D2 Protein of Photosystem II in Chlamydomonas Is Controlled by a High Molecular Mass Complex Containing the RNA Stabilization Factor Nac2 and the Translational Activator RBP40

Christian Schwarz, Ingolf Elles, Jens Kortmann, Markus Piotrowski, and Jörg Nickelsen

Plant Cell 2007 19: 3627-3639. First Published on November 30, 2007; 10.1105/tpc.107.051722

Chloroplast gene expression is regulated mainly at the posttranscriptional level. This work identifies a translational activator for the chloroplast psbD mRNA and demonstrates its functional and physical association with a factor required for psbD mRNA stabilization.

[Abstract] [Full Text] [PDF]

Photosystem II Assembly and Repair Are Differentially Localized in Chlamydomonas

James Uniacke and William Zerges

Plant Cell 2007 19: 3640-3654. First Published on November 30, 2007; 10.1105/tpc.107.054882

In situ evidence reveals that photosystem II subunits encoded by chloroplast mRNAs are synthesized and assembled in a novel compartment in the chloroplast of Chlamydomonas. Synthesis of the D1 subunit for the repair of photodamaged photosystem II complexes was detected generally at thylakoid membranes, consistent with the current model.

[Abstract] [Full Text] [PDF] [Supplemental Data]

BIN4, a Novel Component of the Plant DNA Topoisomerase VI Complex, Is Required for Endoreduplication in Arabidopsis Christian Breuer, Nicola J. Stacey, Christopher E. West, Yunde Zhao, Joanne Chory, Hirokazu Tsukaya, Yoshitaka Azumi, Anthony Maxwell, Keith Roberts, and Keiko Sugimoto-Shirasu Plant Cell 2007 19: 3655-3668. First Published on November 30, 2007; 10.1105/tpc.107.054833 BIN4 encodes a plant-specific, DNA binding protein that acts as a component of the plant DNA topoisomerase VI complex. Loss of BIN4 triggers an ATM- and ATR-dependent DNA damage response in postmitotic cells, and this leads to an early arrest of endoreduplication in Arabidopsis. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Downregulation of Cinnamoyl-Coenzyme A Reductase in Poplar: Multiple-Level Phenotyping Reveals Effects on Cell Wall Polymer Metabolism and Structure

Jean-Charles Leplé, Rebecca Dauwe, Kris Morreel, Véronique Storme, Catherine Lapierre, Brigitte Pollet, Annette Naumann, Kyu-Young Kang, Hoon Kim, Katia Ruel, Andrée Lefèbvre, Jean-Paul Joseleau, Jacqueline Grima-Pettenati, Riet De Rycke, Sara Andersson-Gunnerås, Alexander Erban, Ines Fehrle, Michel Petit-Conil, Joachim Kopka, Andrea Polle, Eric Messens, Björn Sundberg, Shawn D. Mansfield, John Ralph, Gilles Pilate, and Wout Boerjan

Plant Cell 2007 19: 3669-3691. First Published on November 16, 2007; 10.1105/tpc.107.054148

Transgenic poplar, downregulated for a gene involved in lignin biosynthesis, was phenotyped at multiple levels. The data show that in addition to the anticipated lower lignin levels, the xylem unexpectedly had lower levels of hemicelluloses, and the residual lignin incorporated ferulic acid, now to be considered as a new lignin monomer. Chemical pulping of field-grown wood was facilitated.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Saturated Very-Long-Chain Fatty Acids Promote Cotton Fiber and Arabidopsis Cell Elongation by Activating Ethylene Biosynthesis Yong-Mei Qin, Chun-Yang Hu, Yu Pang, Alexander J. Kastaniotis, J. Kalervo Hiltunen, and Yu-Xian Zhu Plant Cell 2007 19: 3692-3704. First Published on November 9, 2007; 10.1105/tpc.107.054437 It is shown that fatty acids with chain lengths >20, especially saturated C24, stimulate significant elongation growth in both cotton fiber and Arabidopsis root and stem cells. This growth-promoting effect is brought about by an enhanced ethylene biosynthesis and signaling, suggesting that the current paradigm for the mechanism of cell elongation may be reassessed. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Profilin Is Essential for Tip Growth in the Moss Physcomitrella patens

Luis Vidali, Robert C. Augustine, Ken P. Kleinman, and Magdalena Bezanilla

Plant Cell 2007 19: 3705-3722. First Published on November 2, 2007; 10.1105/tpc.107.053413

The small actin monomer binding protein, profilin, was shown to be essential for tip growth and for the proper organization of the actin cytoskeleton. Using a complementation assay, the actin and polyproline binding sites on profilin were shown to be required for profilin function in vivo.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Glycolytic Enzymes Associate Dynamically with Mitochondria in Response to Respiratory Demand and Support Substrate Channeling

James W.A. Graham, Thomas C.R. Williams, Megan Morgan, Alisdair R. Fernie, R. George Ratcliffe, and Lee J. Sweetlove

Plant Cell 2007 19: 3723-3738. First Published on November 2, 2007; 10.1105/tpc.107.053371

Glycolytic enzymes have been shown to partition between the cytosol and the outer surface of the mitochondrion, but the functional significance of this partitioning is not known. Here, it is shown that glycolytic enzymes associate with mitochondria dynamically in response to respiratory demand and that the mitochondrially associated enzymes support substrate channeling.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Functional Definition of Outer Membrane Proteins Involved in Preprotein Import into Mitochondria

Ryan Lister, Chris Carrie, Owen Duncan, Lois H.M. Ho, Katharine A. Howell, Monika W. Murcha, and James Whelan

Plant Cell 2007 19: 3739-3759. First Published on November 2, 2007; 10.1105/tpc.107.050534

Proteins are imported through the mitochondrial membranes by complex machinery. In this study, three Arabidopsis mitochondrial outer membrane proteins, TOM20, METAXIN, and mtOM64, were demonstrated to interact directly with proteins targeted to mitochondria and to be involved in the process of protein import.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Nitrate Efflux at the Root Plasma Membrane: Identification of an Arabidopsis Excretion Transporter

Cécile Segonzac, Jean-Christophe Boyer, Emilie Ipotesi, Wojciech Szponarski, Pascal Tillard, Brigitte Touraine, Nicolas Sommerer, Michel Rossignol, and Rémy Gibrat

Plant Cell 2007 19: 3760-3777. First Published on November 9, 2007; 10.1105/tpc.106.048173

Upon various stresses, plant roots may paradoxically undergo a net excretion of NO₃^–, the molecular basis and biological role of which are unknown. This report presents the characterization of a plasma membrane transporter responsible for the root NO₃^– excretion triggered by acidification stresses. It belongs to a subclass of seven members of the large NRT1/PTR family to which it introduces a novel function.

[Abstract] [Full Text] [PDF] [Supplemental Data]

ARGONAUTE4 Is Required for Resistance to Pseudomonas syringae in Arabidopsis

Astrid Agorio and Pablo Vera

Plant Cell 2007 19: 3778-3790. First Published on November 9, 2007; 10.1105/tpc.107.054494

ARGONAUTE4, a component of the pathway that mediates the transcriptional gene silencing associated with siRNA in plants, is shown to play a pivotal role in disease resistance and susceptibility to microbial pathogens in Arabidopsis. These results suggest that gene methylation may mediate critical aspects of plant susceptibility to pathogens.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Structural and Functional Analysis of SGT1 Reveals That Its Interaction with HSP90 Is Required for the Accumulation of Rx, an R Protein Involved in Plant Immunity Marta Botër, Béatrice Amigues, Jack Peart, Christian Breuer, Yasuhiro Kadota, Catarina Casais, Geoffrey Moore, Colin Kleanthous, Francoise Ochsenbein, Ken Shirasu, and Raphaël Guerois Plant Cell 2007 19: 3791-3804. First Published on November 21, 2007; 10.1105/tpc.107.050427 Mutational analyses, NMR-based interaction surface mapping, and biochemical reconstitution experiments reveal fundamental properties of SGT1, which determine interactions with HSP90 and RAR1 related to disease resistance. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

SAD2, an Importin β-Like Protein, Is Required for UV-B Response in Arabidopsis by Mediating MYB4 Nuclear Trafficking

Jinfeng Zhao, Wenhui Zhang, Yang Zhao, Ximing Gong, Lei Guo, Guoli Zhu, Xuechen Wang, Zhizhong Gong, Karen S. Schumaker, and Yan Guo

Plant Cell 2007 19: 3805-3818. First Published on November 9, 2007; 10.1105/tpc.106.048900

Accurate nuclear translocation of signal molecules is essential for plant growth and development. SAD2 is required to transport MYB4 into the nucleus in Arabidopsis, and studying this nuclear translocation process has allowed us to show that the MYB4 transcript and protein are involved in a negative autoregulatory feedback loop and that they are important for UV-B tolerance in plants.

[Abstract] [Full Text] [PDF] [Supplemental Data]

Lysigenous Aerenchyma Formation in Arabidopsis Is Controlled by LESION SIMULATING DISEASE1 Per Mühlenbock, Malgorzata Plaszczyca, Marian Plaszczyca, Ewa Mellerowicz, and Stanislaw Karpinski Plant Cell 2007 19: 3819-3830. First Published on November 30, 2007; 10.1105/tpc.106.048843 Each year, flooding greatly reduces global crop yields. In this work, we describe the formation of lysigenous aerenchyma in Arabidopsis in response to root hypoxia caused by flooding and propose the genetic system essential for this process. This work shows that Arabidopsis is a novel and valid experimental system for the development of flooding-tolerant crops. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

CORRECTIONS:

Correction

Plant Cell 2007 19: 3831. First Published on November 16, 2007; 10.1105/tpc.107.191160

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Correction

Plant Cell 2007 19: 3832. First Published on November 16, 2007; 10.1105/tpc.107.191161

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Correction

Plant Cell 2007 19: 3833. First Published on November 16, 2007; 10.1105/tpc.107.191162

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