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Role of Arabidopsis UV RESISTANCE LOCUS 8 in Plant Growth Reduction under Osmotic Stress and Low Levels of UV-B

Molecular Plant 2014年第5期7卷 773-791页

作者： Rossella Fasano nathalie gonzalez Alessandra Tosco Fabrizio Dal Piaz Teresa Docimo Ramon Serrano Stefania Grillo Antonella Leone Dirk Inze Department of Pharmacy University of Salerno Fisciano Italy Department of Plant Systems Biology VIB 9052 Ghent Belgium Department of Plant Biotechnology and Bioinformatics Ghent University 9052 Gent Belgium Max Planck Institute for Chemical Ecology Jena Germany Instituto de Biologia Molecular y Celular de Plantas Universidad Politecnica de Valencia CSIC Valencia Spain National Research Council of Italy Institute of Plant Genetics Res. Div. Portici Portici Italy

In high-light environments, plants are exposed to different types of stresses, such as an excess of UV-B, but also drought stress which triggers a common morphogenic adaptive response resulting in a general reduction of plant growth. Here, we report that the Arabidopsis thaliana UVRESISTANCE LOCUS 8 （UVR8） gene, a known regulator of the UV-B morphogenic response, was able to complement a Saccharomyces cerevisiae osmo-sensitive mutant and its expression was induced after osmotic or salt stress in Arabidopsis plants. Under low levels of UV-B, plants overexpressing UVR8 are dwarfed with a reduced root development and accumulate more flavonoids compared to control plants. The growth defects are mainly due to the inhibition of cell expansion. The growth inhibition triggered by UVR8 overexpression in plants under low levels of UV-B was exacerbated by mannitol-induced osmotic stress, but it was not significantly affected by ionic stress. In contrast, uvr8-6 mutant plants do not differ from wild-type plants under standard conditions, but they show an increased shoot growth under high-salt stress. Our data suggest that UVR8-mediated accumulation of flavonoid and possibly changes in auxin homeostasis are the underlying mechanism of the observed growth phenotypes and that UVR8 might have an important role for integrating plant growth and stress signals.

关键词： osmotic stress growth reduction cell expansion flavonoid auxin.

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