COMMENTARY:

Translational Genomics for Bioenergy Production from Fuelstock Grasses: Maize as the Model Species

Carolyn J. Lawrence and Virginia Walbot

Plant Cell 2007 19: 2091-2094. First Published on July 27, 2007; 10.1105/tpc.107.053660

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IN THIS ISSUE:

GA Perception and Signal Transduction: Molecular Interactions of the GA Receptor GID1 with GA and the DELLA Protein SLR1 in Rice

Nancy A. Eckardt

Plant Cell 2007 19: 2095-2097.

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IN BRIEF:

Phosphatase AP2C1 Is a Key Component of MAPK Signaling in Arabidopsis

Nancy A. Eckardt

Plant Cell 2007 19: 2098.

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Dominant, Constitutively Active Phytochrome Mutants

Nancy A. Eckardt

Plant Cell 2007 19: 2098.

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RESEARCH ARTICLES:

Natural Variation among Arabidopsis thaliana Accessions for Transcriptome Response to Exogenous Salicylic Acid Hans van Leeuwen, Daniel J. Kliebenstein, Marilyn A.L. West, Kyunga Kim, Remco van Poecke, Fumiaki Katagiri, Richard W. Michelmore, Rebecca W. Doerge, and Dina A. St.Clair Plant Cell 2007 19: 2099-2110. First Published on July 13, 2007; 10.1105/tpc.107.050641 Natural variation for response to salicylic acid, a defense response regulator, is prevalent in Arabidopsis as suggested by abundant expression level polymorphisms detected at both per-gene and gene-network levels in seven diverse accessions. Quantitative variation for response to signals involved in perceiving pathogen attack suggests that the species has greater response capacity than any individual within the species. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

A Functional Link between Rhythmic Changes in Chromatin Structure and the Arabidopsis Biological Clock

Mariano Perales and Paloma Más

Plant Cell 2007 19: 2111-2123. First Published on July 6, 2007; 10.1105/tpc.107.050807

Chromatin remodeling activities involving histone acetylation-deacetylation together with a repressive function of a morning clock–acting protein modulate the expression of TOC1, an essential component of the biological clock. The photoperiodic regulation of clock output rhythms correlates with the photoperiodic changes in TOC1 expression, suggesting a mechanism by which the clock sets the phase of physiological outputs.

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Light-Independent Phytochrome Signaling Mediated by Dominant GAF Domain Tyrosine Mutants of Arabidopsis Phytochromes in Transgenic Plants Yi-shin Su and J. Clark Lagarias Plant Cell 2007 19: 2124-2139. First Published on July 27, 2007; 10.1105/tpc.107.051516 This report communicates the unexpected discovery of fluorescent, nonphotoactive phytochrome mutants that confer light-independent signaling activity. These alleles hold great potential for tailoring photomorphogenesis of any transformable plant species, and their gain-of-function activities reveal new insight into the molecular mechanism of phytochrome signaling. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Molecular Interactions of a Soluble Gibberellin Receptor, GID1, with a Rice DELLA Protein, SLR1, and Gibberellin

Miyako Ueguchi-Tanaka, Masatoshi Nakajima, Etsuko Katoh, Hiroko Ohmiya, Kenji Asano, Shoko Saji, Xiang Hongyu, Motoyuki Ashikari, Hidemi Kitano, Isomaro Yamaguchi, and Makoto Matsuoka

Plant Cell 2007 19: 2140-2155. First Published on July 20, 2007; 10.1105/tpc.106.043729

GID1 encodes a soluble GA receptor in rice that resembles a hormone-sensitive lipase. This study shows that GID1 interacts directly with the rice DELLA protein SLR1 in a GA-dependent manner in planta. The authors also characterize essential GA binding and SLR1-interacting regions of GID1 and GID1-interacting regions of SLR1.

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The Auxin-Regulated AP2/EREBP Gene PUCHI Is Required for Morphogenesis in the Early Lateral Root Primordium of Arabidopsis

Atsuko Hirota, Takehide Kato, Hidehiro Fukaki, Mitsuhiro Aida, and Masao Tasaka

Plant Cell 2007 19: 2156-2168. First Published on July 13, 2007; 10.1105/tpc.107.050674

Lateral root formation is an important developmental process induced by auxin. The newly identified Arabidopsis gene PUCHI, encoding a putative transcription factor, is required for proper pattern of cell division in the early lateral root primordium and affects primordium shape. Expression of PUCHI is induced by auxin and is dependent on auxin-responsive cis-regulatory elements in its promoter.

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Multilevel Interactions between Ethylene and Auxin in Arabidopsis Roots

Anna N. Stepanova, Jeonga Yun, Alla V. Likhacheva, and Jose M. Alonso

Plant Cell 2007 19: 2169-2185. First Published on July 13, 2007; 10.1105/tpc.107.052068

Analysis of global changes in gene expression and early auxin and ethylene responses at the cellular level in Arabidopsis auxin and ethylene response mutants shows how these two hormones reciprocally regulate each other's biosyntheses, influence each other's response pathways, and/or act independently on the same target genes to control root growth.

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Ethylene Upregulates Auxin Biosynthesis in Arabidopsis Seedlings to Enhance Inhibition of Root Cell Elongation

Ranjan Swarup, Paula Perry, Dik Hagenbeek, Dominique Van Der Straeten, Gerrit T.S. Beemster, Göran Sandberg, Rishikesh Bhalerao, Karin Ljung, and Malcolm J. Bennett

Plant Cell 2007 19: 2186-2196. First Published on July 13, 2007; 10.1105/tpc.107.052100

Detailed growth studies show that the ability of the ethylene precursor ACC to inhibit root cell elongation is significantly enhanced in the presence of auxin. Ethylene-regulated root growth is dependent on the transport of auxin from the root apex via the lateral root cap and on auxin responses occurring in multiple elongation zone tissues.

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Ethylene Regulates Root Growth through Effects on Auxin Biosynthesis and Transport-Dependent Auxin Distribution

Kamil Ruzicka, Karin Ljung, Steffen Vanneste, Radka Podhorská, Tom Beeckman, Jirí Friml, and Eva Benková

Plant Cell 2007 19: 2197-2212. First Published on July 13, 2007; 10.1105/tpc.107.052126

It is shown that ethylene stimulates auxin biosynthesis and basipetal auxin transport towards the elongation zone, where it activates a local auxin response leading to inhibition of cell elongation.

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The PP2C-Type Phosphatase AP2C1, Which Negatively Regulates MPK4 and MPK6, Modulates Innate Immunity, Jasmonic Acid, and Ethylene Levels in Arabidopsis

Alois Schweighofer, Vaiva Kazanaviciute, Elisabeth Scheikl, Markus Teige, Robert Doczi, Heribert Hirt, Manfred Schwanninger, Merijn Kant, Robert Schuurink, Felix Mauch, Antony Buchala, Francesca Cardinale, and Irute Meskiene

Plant Cell 2007 19: 2213-2224. First Published on July 13, 2007; 10.1105/tpc.106.049585

AP2C1 was found to be a novel MAPK phosphatase that inactivates the stress-responsive MAPKs MPK4 and MPK6, thus regulating ethylene and modulating plant innate immunity against a fungal necrotrophic pathogen. AP2C1 also negatively regulates wound jasmonates, which correlates with enhanced resistance to herbivores in its absence. This demonstrates a key role for AP2C1 in plant signaling.

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MYC2 Differentially Modulates Diverse Jasmonate-Dependent Functions in Arabidopsis

Bruno Dombrecht, Gang Ping Xue, Susan J. Sprague, John A. Kirkegaard, John J. Ross, James B. Reid, Gary P. Fitt, Nasser Sewelam, Peer M. Schenk, John M. Manners, and Kemal Kazan

Plant Cell 2007 19: 2225-2245. First Published on July 6, 2007; 10.1105/tpc.106.048017

The plant hormone jasmonate (JA) regulates a number of important plant functions, such as pathogen and insect defense, secondary metabolite synthesis, and plant development. This work identifies a number of novel functions for the Arabidopsis transcription factor MYC2 in positively or negatively regulating diverse JA-dependent genes and plant functions during JA signaling.

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The TORMOZ Gene Encodes a Nucleolar Protein Required for Regulated Division Planes and Embryo Development in Arabidopsis

Megan E. Griffith, Ulrike Mayer, Arnaud Capron, Quy A. Ngo, Anandkumar Surendrarao, Regina McClinton, Gerd Jürgens, and Venkatesan Sundaresan

Plant Cell 2007 19: 2246-2263. First Published on July 6, 2007; 10.1105/tpc.106.042697

Mutation of the TORMOZ gene results in embryonic cell divisions that are transverse or oblique instead of longitudinal. The TORMOZ gene encodes a conserved nucleolar protein previously linked to rRNA processing in yeast. This study suggests an unexpected connection between nucleolar functions and the specification of longitudinal divisions in plant cells.

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Functional Analysis of the Epidermal-Specific MYB Genes CAPRICE and WEREWOLF in Arabidopsis

Rumi Tominaga, Mineko Iwata, Kiyotaka Okada, and Takuji Wada

Plant Cell 2007 19: 2264-2277. First Published on July 20, 2007; 10.1105/tpc.106.045732

In this study, the differences between WEREWOLF (WER) and CAPRICE (CPC) R3 MYB functions were examined. The results support the competition model for CPC and WER in determining root hair cell fate and further suggest that CPC evolved from WER as a result of truncation of the activation domain and loss of DNA binding ability.

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A Unique ß1,3-Galactosyltransferase Is Indispensable for the Biosynthesis of N-Glycans Containing Lewis a Structures in Arabidopsis thaliana Richard Strasser, Jayakumar Singh Bondili, Ulrike Vavra, Jennifer Schoberer, Barbara Svoboda, Josef Glössl, Renaud Léonard, Johannes Stadlmann, Friedrich Altmann, Herta Steinkellner, and Lukas Mach Plant Cell 2007 19: 2278-2292. First Published on July 13, 2007; 10.1105/tpc.107.052985 N-glycosylation is a major posttranslational modification of proteins in plants. Understanding the physiological role of complex N-glycans in plants requires the elucidation of the whole biosynthesis pathway. This study describes the identification of the last elusive plant glycosyltransferase involved in the biosynthesis of complex N-glycans. [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

An Ustilago maydis Gene Involved in H₂O₂ Detoxification Is Required for Virulence

Lázaro Molina and Regine Kahmann

Plant Cell 2007 19: 2293-2309. First Published on July 6, 2007; 10.1105/tpc.107.052332

Ustilago maydis yap1 was identified as an ortholog of Yeast AP-1-like (YAP1), which regulates the oxidative stress response in Saccharomyces. U. maydis yap1 mutants displayed higher sensitivity to H₂O₂ than wild-type cells, and their virulence in maize was significantly reduced. Microarray analysis identified a set of yap1-regulated genes. Deletion mutants of two such genes, encoding peroxidases, also showed attenuated virulence.

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