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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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First finding of coesite in the eclogitic continental crust of the Sesia Zone, Italian Western Alps

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National Science Review 2023年第5期10卷 108页

作者： Giorgio V.dal piaz Accademia Nazionale dei Lincei

The Western Alps provide classic examples of eclogite facies subduction metamorphism widely preserved in Adriaand Europe-derived continental nappes and interposed ophiolitic units derived from the suture of the Piedmo...

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Risk Analysis Comparison between the Mission NANOSATC-BR1 and NANOSATC-BR2

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Journal of Mechanics Engineering and Automation 2015年第2期5卷 88-94页

作者： Marcos Antonio Laurindo dal piaz Lucas Lourencena Caldas Franke Mauricio Ricardo Balestrini Iago Camargo Silveira Guilherme Paul Jaenisch Tiago Travi Farias Otavio Santos Cupertino Durao Nelson Jorge Schuch Advanced Mechanics Laboratory Southern Regional Space Research Center National Institute for Space Research Santa Maria97.105-970 Brazil Radiofrequeney and Communications Laboratory Southern Regional Space Research Center National Institute for SpaceResearch Santa Maria 97.105o970 Brazil National Institute for Space Research S6o Josd dos Campos 12.245-970 Brazil Southern Regional Space Research Center National Institute for Space Research in collaboration with the Santa Maria SpaceScience Laboratory Technological Center from Federal University of Santa Maria Santa Maria 97.105-900 Brazil

The goal of this work is to perform the risks analysis of the mission NANOSATC-BR1 and NANOSATC-BR2 and then compare them linearly. The NANOSATC-BR1 and NANOSATC-BR2 are the first and the second satellite, respectively. They belonged to the project NANOSATC-BR-development of CubeSats, which is performed in the facilities built by the partnership between the National Institute of Space Research and the Technological Center from Federal University of Santa Maria. The project focuses on the development of a scientific instrumentation and, simultaneously, the design development, construction, qualification and launch of a national scientific nanosatellite, in a cube shape with 100 mm of edge and near to 1.33 kg of mass, per unit （U）. The risk analysis was held to identify and minimize the project＇s risks of failure, due to its complexity, assuring the mission success, preventing extra pays and rework. The software, CubeSat Mission Design Software Tool for Risk Estimating, which uses statistical regression methods, was used. So, we were capable to measure the project＇s most critical steps assuring its success. The NANOSATC-BR1 was launched in June 19 and it is orbiting the Earth in a nominal regime and the NANOSATC-BR2 has been scheduled to be launched in 2016.

关键词： Analysis risk CubeSat.

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