IN THIS ISSUE:

DOT/UFO Emerges as a Key Factor in Inflorescence Patterning

Nancy A. Eckardt

Plant Cell 2008 20: 2003-2005. First Published on August 29, 2008; doi:10.1105/tpc.108.062869

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IN BRIEF:

A Protein Disulfide Isomerase Plays a Role in Programmed Cell Death

Kathleen L. Farquharson

Plant Cell 2008 20: 2006. First Published on August 1, 2008; doi:10.1105/tpc.108.200810

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An Endoplasmic Reticulum Protein Involved in Lipid Transfer to Chloroplasts

Nancy R. Hofmann

Plant Cell 2008 20: 2007. First Published on August 8, 2008; doi:10.1105/tpc.108.200811

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Transposon Trouble: Macrotransposition and Chromosome Remodeling in Maize

Jennifer Mach

Plant Cell 2008 20: 2008. First Published on August 15, 2008; doi:10.1105/tpc.108.200812

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PERSPECTIVE:

From Guard to Decoy: A New Model for Perception of Plant Pathogen Effectors

Renier A.L. van der Hoorn and Sophien Kamoun

Plant Cell 2008 20: 2009-2017. First Published on August 22, 2008; doi:10.1105/tpc.108.060194

[Abstract] [Full Text] [PDF]

RESEARCH ARTICLES:

Macrotransposition and Other Complex Chromosomal Restructuring in Maize by Closely Linked Transposons in Direct Orientation

Jun T. Huang and Hugo K. Dooner

Plant Cell 2008 20: 2019-2032. First Published on August 15, 2008; doi:10.1105/tpc.108.060582

DNA transposon activity has helped to shape present-day plant genomes. This article documents macrotransposition and the multiple other ways by which a pair of closely linked transposons in direct orientation, a common product of hAT and CACTA element transposition, can restructure plant chromosomes.

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

Patterning of Inflorescences and Flowers by the F-Box Protein DOUBLE TOP and the LEAFY Homolog ABERRANT LEAF AND FLOWER of Petunia

Erik Souer, Alexandra B. Rebocho, Mattijs Bliek, Elske Kusters, Robert A.M. de Bruin, and Ronald Koes

Plant Cell 2008 20: 2033-2048. First Published on August 19, 2008; doi:10.1105/tpc.108.060871

This study shows that DOUBLE TOP of petunia is an F-box protein that interacts with the LEAFY homolog ABERRANT LEAF AND FLOWER and is essential for flower formation and activation of floral organ identity genes. The authors show that the transcriptional regulation of DOT is the major factor that determines when and where flowers are made in petunia.

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

Functional Diversification of CLAVATA3-Related CLE Proteins in Meristem Maintenance in Rice Takuya Suzaki, Akiko Yoshida, and Hiro-Yuki Hirano Plant Cell 2008 20: 2049-2058. First Published on August 1, 2008; doi:10.1105/tpc.107.057257 Maintenance of stem cells in shoot and root apical meristems is critical for postembryonic development, and the overall mechanism of meristem maintenance is conserved in angiosperms. This work shows that two proteins in rice, FLORAL ORGAN NUMBER2 (FON2) and FON2-LIKE CLE PROTEIN1 (FCP1/CLE402), have different functions in negatively regulating stem cell identity. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

ARABIDOPSIS THALIANA HOMEOBOX GENE1 Establishes the Basal Boundaries of Shoot Organs and Controls Stem Growth

Concepción Gómez-Mena and Robert Sablowski

Plant Cell 2008 20: 2059-2072. First Published on August 29, 2008; doi:10.1105/tpc.108.059188

Development of the boundary between the stem and lateral organs is poorly understood. This work shows that ARABIDOPSIS THALIANA HOMEOBOX GENE1 establishes the boundaries between the stem and shoot organs and represses stem growth during the vegetative phase.

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

The milkweed pod1 Gene Encodes a KANADI Protein That Is Required for Abaxial/Adaxial Patterning in Maize Leaves

Héctor Candela, Robyn Johnston, Abigail Gerhold, Toshi Foster, and Sarah Hake

Plant Cell 2008 20: 2073-2087. First Published on August 29, 2008; doi:10.1105/tpc.108.059709

This work examines milkweed pod1 (mwp1), which encodes a transcription factor whose activity is required to maintain abaxial cell fate in the leaf. mwp1 mutants show sectors of tissue with adaxial characteristics; the juxtaposition of these sectors with abaxial tissue causes the outgrowth of leaf flaps, similar to ectopic leaf margins.

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The MADS Domain Protein DIANA Acts Together with AGAMOUS-LIKE80 to Specify the Central Cell in Arabidopsis Ovules

Marian Bemer, Mieke Wolters-Arts, Ueli Grossniklaus, and Gerco C. Angenent

Plant Cell 2008 20: 2088-2101. First Published on August 19, 2008; doi:10.1105/tpc.108.058958

Mutants of the type I MADS box gene DIANA have aberrant embryo sacs that fail to produce seed and have a collapsed central cell. This study shows that localization of the DIANA protein to the central cell nuclei depends on the presence of AGAMOUS-LIKE80, another MADS box protein. These proteins form a heterodimer in vivo that functions to dictate the fate of the central cell.

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

Type B Response Regulators of Arabidopsis Play Key Roles in Cytokinin Signaling and Plant Development

Rebecca D. Argyros, Dennis E. Mathews, Yi-Hsuan Chiang, Christine M. Palmer, Derek M. Thibault, Naomi Etheridge, D. Aaron Argyros, Michael G. Mason, Joseph J. Kieber, and G. Eric Schaller

Plant Cell 2008 20: 2102-2116. First Published on August 22, 2008; doi:10.1105/tpc.108.059584

Type-B Arabidopsis response regulators (ARRs) are transcription factors that regulate the cytokinin signaling pathway. This study evaluates the role of three ARRs (ARR1, ARR10, and ARR12) in plant growth and development and provides evidence that cytokinin directs downstream responses via a multistep phosphorelay mechanism that culminates in transcriptional regulation by ARR1, ARR10, and ARR12.

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

The Cold-Inducible CBF1 Factor–Dependent Signaling Pathway Modulates the Accumulation of the Growth-Repressing DELLA Proteins via Its Effect on Gibberellin Metabolism

Patrick Achard, Fan Gong, Soizic Cheminant, Malek Alioua, Peter Hedden, and Pascal Genschik

Plant Cell 2008 20: 2117-2129. First Published on August 29, 2008; doi:10.1105/tpc.108.058941

This work examines the role of GA and DELLA proteins in cold-meditated retardation of growth. Overexpression of CBF1, a C-repeat/drought-responsive element binding factor, produces constitutive cold tolerance, late flowering, and dwarfism. The authors show genetically and molecularly that this phenotype is produced through the accumulation of DELLA proteins.

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

Brassinosteroids Regulate Grain Filling in Rice Chuan-yin Wu, Anthony Trieu, Parthiban Radhakrishnan, Shing F. Kwok, Sam Harris, Ke Zhang, Jiulin Wang, Jianmin Wan, Huqu Zhai, Suguru Takatsuto, Shogo Matsumoto, Shozo Fujioka, Kenneth A. Feldmann, and Roger I. Pennell Plant Cell 2008 20: 2130-2145. First Published on August 15, 2008; doi:10.1105/tpc.107.055087 This study found that sterol C-22 hydroxylases expressed in the stems, leaves, and roots of rice stimulated intermediate steps in brassinosteroid biosynthesis and increased seed weight in greenhouse- and field-grown plants. Microarray gene expression analysis and photosynthesis measurements suggested that extra flow of assimilate from the leaves enhanced seed filling. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Arabidopsis TONNEAU1 Proteins Are Essential for Preprophase Band Formation and Interact with Centrin

Juliette Azimzadeh, Philippe Nacry, Anna Christodoulidou, Stéphanie Drevensek, Christine Camilleri, Nardjis Amiour, François Parcy, Martine Pastuglia, and David Bouchez

Plant Cell 2008 20: 2146-2159. First Published on August 29, 2008; doi:10.1105/tpc.107.056812

The tonneau1 mutant displays severe cellular defects and dysfunction of the cortical cytoskeleton. TON1 proteins localize to the cytoskeleton, interact with centrin, and are similar to proteins associated with microtubule organizing centers in eukaryotes, suggesting that functions involved in the organization of microtubule arrays by the centrosome were conserved during evolution of land plants.

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

Comprehensive Flavonol Profiling and Transcriptome Coexpression Analysis Leading to Decoding Gene–Metabolite Correlations in Arabidopsis Keiko Yonekura-Sakakibara, Takayuki Tohge, Fumio Matsuda, Ryo Nakabayashi, Hiromitsu Takayama, Rie Niida, Akiko Watanabe-Takahashi, Eri Inoue, and Kazuki Saito Plant Cell 2008 20: 2160-2176. First Published on August 29, 2008; doi:10.1105/tpc.108.058040 Here, flavonol is used as a case study in a novel strategy for functional genomics coupling the detailed analysis of secondary metabolites with coexpression data. This method can identify the biosynthetic pathways of plant compounds associated with specific organs and developmental stages as well as their genetic components. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Molecular Remodeling of Photosystem II during State Transitions in Chlamydomonas reinhardtii

Masakazu Iwai, Yuichiro Takahashi, and Jun Minagawa

Plant Cell 2008 20: 2177-2189. First Published on August 29, 2008; doi:10.1105/tpc.108.059352

Light-harvesting complex II proteins migrate between photosystem I and II during state transitions. This study reports on the behavior of light-harvesting complex II proteins associated with and dissociated from photosystem II during state transitions, finding that photosystem II undergoes remodeling induced by multistep phosphorylation of light-harvesting complex II proteins.

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

Lipid Trafficking between the Endoplasmic Reticulum and the Plastid in Arabidopsis Requires the Extraplastidic TGD4 Protein

Changcheng Xu, Jilian Fan, Adam J. Cornish, and Christoph Benning

Plant Cell 2008 20: 2190-2204. First Published on August 8, 2008; doi:10.1105/tpc.108.061176

Lipid transfer between the endoplasmic reticulum (ER) and the chloroplast is essential for chloroplast development and plant growth. An ER-associated protein, TGD4, is identified in Arabidopsis that plays a crucial role in ER-to-plastid lipid trafficking and chloroplast biogenesis. Loss-of-function mutants accumulate unusual lipids, have severe growth phenotypes, and are sterile.

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

Arabidopsis Protein Disulfide Isomerase-5 Inhibits Cysteine Proteases during Trafficking to Vacuoles before Programmed Cell Death of the Endothelium in Developing Seeds

Christine Andème Ondzighi, David A. Christopher, Eun Ju Cho, Shu-Choeng Chang, and L. Andrew Staehelin

Plant Cell 2008 20: 2205-2220. First Published on August 1, 2008; doi:10.1105/tpc.108.058339

This study presents a mechanism for the regulation of programmed cell death (PCD) in eukaryotic cells by addressing the central question of how PCD-related proteases are transported to vacuoles without disrupting the biosynthetic apparatus and endomembrane system. It is shown that Protein Disulfide Isomerase-5 (PDI5) both chaperones and inhibits Cys proteases before PCD.

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

Rpl33, a Nonessential Plastid-Encoded Ribosomal Protein in Tobacco, Is Required under Cold Stress Conditions Marcelo Rogalski, Mark A. Schöttler, Wolfram Thiele, Waltraud X. Schulze, and Ralph Bock Plant Cell 2008 20: 2221-2237. First Published on August 29, 2008; doi:10.1105/tpc.108.060392 In this work, the function of several plastid genome–encoded ribosomal proteins from tobacco was investigated by reverse genetics. Ribosomal proteins S2, S4, and L20 turned out to be essential for cell viability, whereas ribosomal protein L33 appeared to be required only for rapid recovery from chilling stress. [Abstract] [Full Text] [PDF] OPEN ACCESS ARTICLE

The Arabidopsis NFYA5 Transcription Factor Is Regulated Transcriptionally and Posttranscriptionally to Promote Drought Resistance

Wen-Xue Li, Youko Oono, Jianhua Zhu, Xin-Jian He, Jian-Min Wu, Kei Iida, Xiao-Yan Lu, Xinping Cui, Hailing Jin, and Jian-Kang Zhu

Plant Cell 2008 20: 2238-2251. First Published on August 5, 2008; doi:10.1105/tpc.108.059444

This work shows that Arabidopsis NFYA5 is a CCAAT box binding transcription factor important for drought resistance. Drought stress upregulated NFYA5 gene expression at both the transcriptional and posttranscriptional levels, the latter involving decreased expression of miR169a, which targets the NFYA5 transcript for cleavage. In addition, overexpression of NFYA5 increased drought resistance.

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

RD19, an Arabidopsis Cysteine Protease Required for RRS1-R–Mediated Resistance, Is Relocalized to the Nucleus by the Ralstonia solanacearum PopP2 Effector

Maud Bernoux, Ton Timmers, Alain Jauneau, Christian Brière, Pierre J.G.M. de Wit, Yves Marco, and Laurent Deslandes

Plant Cell 2008 20: 2252-2264. First Published on August 15, 2008; doi:10.1105/tpc.108.058685

In Arabidopsis, resistance to the pathogenic bacterium Ralstonia solanacearum is triggered, after recognition of the bacterial effector Pseudomonas outer protein P2, by the RESISTANT TO R. SOLANACEARUM 1-R (RRS1-R) protein. This study identifies RESPONSIVE TO DEHYDRATION19, an Arabidopsis vacuole-associated Cys protease, as a key player in RRS1-R–mediated resistance.

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

RACK1 Functions in Rice Innate Immunity by Interacting with the Rac1 Immune Complex Ayako Nakashima, Letian Chen, Nguyen Phuong Thao, Masayuki Fujiwara, Hann Ling Wong, Masayoshi Kuwano, Kenji Umemura, Ken Shirasu, Tsutomu Kawasaki, and Ko Shimamoto Plant Cell 2008 20: 2265-2279. First Published on August 22, 2008; doi:10.1105/tpc.107.054395 Rice RACK1 was shown to interact with Rac1 GTPase by affinity chromatography. RACK1 plays a role in production of reactive oxygen species and in resistance to blast fungus infection via interaction with NADPH oxidase, RAR1, and SGT1, which are conserved components in plant innate immunity. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

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