THE PLANT CELL ONLINE -- Table of Contents (20 [5])

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IN THIS ISSUE:

Epistasis and Genetic Regulation of Variation in the Arabidopsis Metabolome: Nancy A. Eckardt; Plant Cell 2008 20: 1185-1186. First Published on May 30, 2008; 10.1105/tpc.108.061051; [Full Text] [PDF]

IN BRIEF:

Newly Isolated Circadian Clock Components Conserved across Eukaryotes: Jennifer Mach; Plant Cell 2008 20: 1187. First Published on May 30, 2008; 10.1105/tpc.108.200510; [Full Text] [PDF]

An Exocyst Vesicle Tethering Complex in Plants: Nancy A. Eckardt; Plant Cell 2008 20: 1188. First Published on May 20, 2008; 10.1105/tpc.108.200511; [Full Text] [PDF]

HISTORICAL PERSPECTIVE ESSAYS:

The Scientific Roots of Modern Plant Biotechnology: Ian M. Sussex; Plant Cell 2008 20: 1189-1198. First Published on May 30, 2008; 10.1105/tpc.108.058735; [Full Text] [PDF]

RESEARCH ARTICLES:

Biochemical Networks and Epistasis Shape the Arabidopsis thaliana Metabolome: Heather C. Rowe, Bjarne Gram Hansen, Barbara Ann Halkier, and Daniel J. Kliebenstein; Plant Cell 2008 20: 1199-1216. First Published on May 30, 2008; 10.1105/tpc.108.058131; This work shows that quantitative trait loci modulating the Arabidopsis thaliana metabolome are organized into epistatically interacting hubs regulating large swaths of metabolism. Hypothetical biosynthetic pathways incorporating unknown metabolites with known biosynthetic pathways and novel pathways were generated using this information; [Abstract] [Full Text] [PDF] [Supplemental Data]

Signals Derived from YABBY Gene Activities in Organ Primordia Regulate Growth and Partitioning of Arabidopsis Shoot Apical Meristems: Alexander Goldshmidt, John Paul Alvarez, John L. Bowman, and Yuval Eshed; Plant Cell 2008 20: 1217-1230. First Published on May 9, 2008; 10.1105/tpc.107.057877; The YAB1 genes FIL and YAB3 are expressed in initiating lateral organs at their inception. Their cell autonomous gene products regulate the expression of nearby central meristem zone markers and sequentially affect the phyllotactic patterns of lateral organs, providing the apical meristem with essential positional cues.; [Abstract] [Full Text] [PDF] [Supplemental Data]

Dual Effects of miR156-Targeted SPL Genes and CYP78A5/KLUH on Plastochron Length and Organ Size in Arabidopsis thaliana: Jia-Wei Wang, Rebecca Schwab, Benjamin Czech, Erica Mica, and Detlef Weigel; Plant Cell 2008 20: 1231-1243. First Published on May 20, 2008; 10.1105/tpc.108.058180; Two genetic axes are shown to have correlated effects on the time interval that elapses between the formation of successive leaves and on the final sizes of leaves. When leaves are made more rapidly, their final sizes are smaller, and vice versa, hinting at a hitherto unappreciated compensation mechanism linking emergence and growth of leaves.; [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

XAP5 CIRCADIAN TIMEKEEPER Coordinates Light Signals for Proper Timing of Photomorphogenesis and the Circadian Clock in Arabidopsis: Ellen L. Martin-Tryon and Stacey L. Harmer; Plant Cell 2008 20: 1244-1259. First Published on May 30, 2008; 10.1105/tpc.107.056655; This work identifies XAP5 CIRCADIAN TIMEKEEPER as a protein involved in plant perception of light and the normal functioning of the circadian clock. Although the primary sequence of this protein does not reveal its molecular function, it is highly conserved across eukaryotes, suggesting it may serve similar roles in other systems.; [Abstract] [Full Text] [PDF] [Supplemental Data]

SOMNUS, a CCCH-Type Zinc Finger Protein in Arabidopsis, Negatively Regulates Light-Dependent Seed Germination Downstream of PIL5: Dong Hwan Kim, Shinjiro Yamaguchi, Soohwan Lim, Eunkyoo Oh, Jeongmu Park, Atsushi Hanada, Yuji Kamiya, and Giltsu Choi; Plant Cell 2008 20: 1260-1277. First Published on May 16, 2008; 10.1105/tpc.108.058859; This work describes SOMNUS, a CCCH-type zinc finger protein that represses seed germination, regulating gibberellic acid and abscisic acid levels by acting on hormone metabolic genes. SOMNUS transcription is activated by a phytochrome-regulated bHLH transcription factor, PHYTOCHROME-INTERACTING FACTOR3-LIKE5, which binds directly to the SOMNUS promoter.; [Abstract] [Full Text] [PDF] [Supplemental Data]

MTA Is an Arabidopsis Messenger RNA Adenosine Methylase and Interacts with a Homolog of a Sex-Specific Splicing Factor: Silin Zhong, Hongying Li, Zsuzsanna Bodi, James Button, Laurent Vespa, Michel Herzog, and Rupert G. Fray; Plant Cell 2008 20: 1278-1288. First Published on May 27, 2008; 10.1105/tpc.108.058883; N6-methyladenosine (m⁶A) is a widespread modification found in many eukaryotic mRNAs. The results reported here demonstrate an essential function for the Arabidopsis m⁶A methylase. The interaction between this methylase and a homolog of a metazoan splicing factor indicates possible RNA processing events that might be regulated or altered by this base modification.; [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Identification of a Xylogalacturonan Xylosyltransferase Involved in Pectin Biosynthesis in Arabidopsis: Jacob Krüger Jensen, Susanne Oxenbøll Sørensen, Jesper Harholt, Naomi Geshi, Yumiko Sakuragi, Isabel Møller, Joris Zandleven, Adriana J. Bernal, Niels Bjerg Jensen, Charlotte Sørensen, Markus Pauly, Gerrit Beldman, William G.T. Willats, and Henrik Vibe Scheller; Plant Cell 2008 20: 1289-1302. First Published on May 6, 2008; 10.1105/tpc.107.050906; Pectin's complex polysaccharide structure requires many enzymes for its biosynthesis, but few have been identified. This work identifies a Golgi-localized enzyme specific to synthesis of one pectin type, xylogalacturonan. Mutants defective in that enzyme show reduced xylose in the cell wall.; [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

A Mutant Impaired in the Production of Plastome-Encoded Proteins Uncovers a Mechanism for the Homeostasis of Isoprenoid Biosynthetic Enzymes in Arabidopsis Plastids: Úrsula Flores-Pérez, Susanna Sauret-Güeto, Elisabet Gas, Paul Jarvis, and Manuel Rodríguez-Concepción; Plant Cell 2008 20: 1303-1315. First Published on May 9, 2008; 10.1105/tpc.108.058768; Plastidial isoprenoids, such as carotenoids, chlorophylls, and hormones, are essential for plant life. This work shows that the levels of key nuclear-encoded enzymes involved in the production of isoprenoid precursors are modulated within plastids by a mechanism that involves the activity of plastome-encoded proteins and the stromal Clp protease.; [Abstract] [Full Text] [PDF] [Supplemental Data]

Mutation of a Rice Gene Encoding a Phenylalanine Biosynthetic Enzyme Results in Accumulation of Phenylalanine and Tryptophan: Tetsuya Yamada, Fumio Matsuda, Koji Kasai, Shuichi Fukuoka, Keisuke Kitamura, Yuzuru Tozawa, Hisashi Miyagawa, and Kyo Wakasa; Plant Cell 2008 20: 1316-1329. First Published on May 16, 2008; 10.1105/tpc.107.057455; In this report, analysis of the rice Mtr1 mutant demonstrated that feedback regulation of prephenate dehydratase (PDT) is essential for the regulation of both Trp and Phe accumulation in rice. Morevoer, PDT was also shown both to possess arogenate dehydratase (ADT) activity and to prefer arogenate as a substrate. The PDT enzyme in rice thus likely functions primarily as an ADT.; [Abstract] [Full Text] [PDF] [Supplemental Data]

An Exocyst Complex Functions in Plant Cell Growth in Arabidopsis and Tobacco: Michal Hála, Rex Cole, Lukás Synek, Edita Drdová, Tamara Pecenková, Alfred Nordheim, Tobias Lamkemeyer, Johannes Madlung, Frank Hochholdinger, John E. Fowler, and Viktor Zársky; Plant Cell 2008 20: 1330-1345. First Published on May 20, 2008; 10.1105/tpc.108.059105; The plant cell grows and changes its shape via intensive localized secretion. This work characterizes an important part of that machinery, the exocytic vesicle tethering complex known as the exocyst in animals and yeast. Using methods of genetics, biochemistry, and cell biology, the authors provide evidence that this complex exists and functions in plants.; [Abstract] [Full Text] [PDF] [Supplemental Data]

Dual Fatty Acyl Modification Determines the Localization and Plasma Membrane Targeting of CBL/CIPK Ca²⁺ Signaling Complexes in Arabidopsis: Oliver Batistic, Nadav Sorek, Stefanie Schültke, Shaul Yalovsky, and Jörg Kudla; Plant Cell 2008 20: 1346-1362. First Published on May 23, 2008; 10.1105/tpc.108.058123; Calcineurin B–like (CBL) proteins are key calcium sensors in plants that interact with CBL-interacting protein kinases (CIPKs). This work reports that myristoylation and S-acylation are required for CBL1 function and are crucial for targeting preassembled CBL/CIPK complexes to the plasma membrane. Lipid modification of the calcium sensor moiety thus provides a mechanism in calcium signaling.; [Abstract] [Full Text] [PDF] [Supplemental Data]

Dynamics of Arabidopsis Dynamin-Related Protein 1C and a Clathrin Light Chain at the Plasma Membrane: Catherine A. Konopka, Steven K. Backues, and Sebastian Y. Bednarek; Plant Cell 2008 20: 1363-1380. First Published on May 23, 2008; 10.1105/tpc.108.059428; The molecular machinery of endocytosis in plant cells is largely uncharacterized. Using live-cell imaging, this work identifies a dynamin-related protein and a clathrin light chain as components of a putative clathrin-mediated endocytic (CME) pathway in Arabidopsis. The dynamics of these proteins demonstrate striking differences between the CME pathways in plants and those in mammals and yeast.; [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

A Transporter Regulating Silicon Distribution in Rice Shoots: Naoki Yamaji, Namiki Mitatni, and Jian Feng Ma; Plant Cell 2008 20: 1381-1389. First Published on May 30, 2008; 10.1105/tpc.108.059311; Silicon is involved in defending plants from biotic and abiotic stresses. This work identifies Lsi6 as a silicon transporter in the xylem parenchyma cells of leaf sheaths and blades and shows that it is responsible for the transport of silicon out of the xylem and subsequently regulates the distribution of Si in the leaf.; [Abstract] [Full Text] [PDF] [HTML Page - index.htslp][Supplemental Data]

MAPK Signaling Regulates Nitric Oxide and NADPH Oxidase-Dependent Oxidative Bursts in Nicotiana benthamiana: Shuta Asai, Kohji Ohta, and Hirofumi Yoshioka; Plant Cell 2008 20: 1390-1406. First Published on May 30, 2008; 10.1105/tpc.107.055855; Nitric oxide (NO) and reactive oxygen species (ROS) have been implicated in innate immunity in plants. This work explores the specific MAP kinase cascades that lead to NO and ROS generation in response to the protein elicitor INF1 in Nicotiana benthamiana leaves.; [Abstract] [Full Text] [PDF] [Supplemental Data] OPEN ACCESS ARTICLE

Prepenetration Apparatus Assembly Precedes and Predicts the Colonization Patterns of Arbuscular Mycorrhizal Fungi within the Root Cortex of Both Medicago truncatula and Daucus carota: Andrea Genre, Mireille Chabaud, Antonella Faccio, David G. Barker, and Paola Bonfante; Plant Cell 2008 20: 1407-1420. First Published on May 30, 2008; 10.1105/tpc.108.059014; This study provides a unifying description of host intracellular reorganization anticipating arbuscular mycorrhizal colonization of epidermal and cortical tissues for both the legume Medicago truncatula and the nonlegume Daucus carota involving alternative intercellular and intracellular infection strategies.; [Abstract] [Full Text] [PDF] [Supplemental Data]