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Regulation of Shoot and Root Development through Mutual Signaling

Molecular Plant 2012年第5期5卷 974-983页

作者： Jerome Puig Germain Pauluzzi emmanuel guiderdoni Pascal Gantet Universite Montpellier 2 UMR DAP Bat 15 CC 002 Place Eugene Bataillon 34095 Montpellier Cedex 5 France CIRAD UMR DAP Avenue Agropolis TA A-96/03 34398 Montpellier Cedex 5 France University of Science and Technology of Hanoi LMI RICE Agricultural Genetics Institute Ha Noi Viet Nam IRD UMR DIADE Avenue Agropolis 34398 Montpellier Cedex 5 France

Plants adjust their development in relation to the availability of nutrient sources. This necessitates signal- ing between root and shoot. Aside from the well-known systemic signaling processes mediated by auxin, cytokinin, and sugars, new pathways involving carotenoid-derived hormones have recently been identified. The auxin-responsive MAX pathway controls shoot branching through the biosynthesis of strigolactone in the roots. The BYPASSI gene affects the production of an as-yet unknown carotenoid-derived substance in roots that promotes shoot development. Novel local and systemic mechanisms that control adaptive root development in response to nitrogen and phosphorus starvation were recently discovered. Notably, the ability of the NITRATE TRANSPORTER 1.1 to transport auxin drew for the first time a functional link between auxin, root development, and nitrate availability in soil. The study of plant response to phos- phorus starvation allowed the identification of a systemic mobile miRNA. Deciphering and integrating these signaling pathways at the whole-plant level provide a new perspective for understanding how plants regulate their development in response to environmental cues.

关键词： plant development systemic signaling strigolactone BYPASS1 nitrate phosphate miRNA.

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SALT-RESPONSIVE ERF1 Is a Negative Regulatorof Grain Filling and Gibberellin-MediatedSeedling Establishment in Rice

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Molecular Plant 2014年第2期7卷 404-421页

作者： Romy Schmidt Jos H.M. Schippers Delphine Mieulet Mutsumi Watanabe Rainer Hoefgen emmanuel guiderdoni Bernd Mueller-Roeber Institute of Biochemistry and Biology University of Potsdam Karl-Liebknecht-Str. 24–25 14476 Potsdam Germany Max Planck Institute of Molecular Plant Physiology Am Mühlenberg 1 14476 Potsdam Germany CIRAD UMR AGAP Avenue Agropolis 34398 Montpellier Cedex 5 France

Grain quality is an important agricultural trait that is mainly determined by grain size and ***, we characterize the role of the rice transcription factor （TF） SALT-RESPONSIVE ERF1 （SERF1） during grain develop-ment. Through genome-wide expression profiling and chromatin immunoprecipitation, we found that SERF1 directlyregulates RICE PROLAMIN-BOX BINDING FACTOR （RPBF）, a TF that functions as a positive regulator of grain filling. Lossof SERF1 enhances RPBF expression resulting in larger grains with increased starch content, while SERF1 overexpressionrepresses RPBF resulting in smaller grains. Consistently, during grain filling, starch biosynthesis genes such as GRANULE-BOUND STARCH SYNTHASEI （GBSSI）, STARCH SYNTHASEI （SSI）, SSIIla, and ADP-GLUCOSE PYROPHOSPHORYLASELARGE SUBUNIT2 （AGPL2） are up-regulated in SERF1 knockout grains. Moreover, SERF1 is a direct upstream regulator ofGBSSI. In addition, SERF1 negatively regulates germination by controlling RPBF expression, which mediates the gibberel-lic acid （GA）-induced expression of RICE AMYLASEIA （RAmylA）. Loss of SERF1 results in more rapid seedling establish-ment, while SERF1 overexpression has the opposite effect. Our study reveals that SERF1 represents a negative regulatorof grain filling and seedling establishment by timing the expression of RPBF.

关键词： RPBF rice grain filling germination SERF1 gibberellic acid

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