tailieunhanh - Báo cáo khoa học: Plant oxylipins: role of jasmonic acid during programmed cell death, defence and leaf senescence

Plants are continuously challenged by a variety of abiotic and biotic cues. To deter feeding insects, nematodes and fungal and bacterial pathogens, plants have evolved a plethora of defence strategies. A central player in many of these defence responses is jasmonic acid. | MINIREVIEW Plant oxylipins role of jasmonic acid during programmed cell death defence and leaf senescence Christiane Reinbothe1 2 Armin Springer1 Iga Samol2 and Steffen Reinbothe2 1 Lehrstuhlfur Pflanzenphysiologie Universitat Bayreuth Germany 2 Laboratoire de Génétique moleculaires des Plantes Universite Joseph Fourier Grenoble France Keywords biotic and abiotic stress responses chloroplast dys-regulation of chlorophyll metabolism fluorescent flu mutant A. thaliana gene expression photooxidative stress reactive oxygen species ROS signalling singlet oxygen transcriptional and translational control Plants are continuously challenged by a variety of abiotic and biotic cues. To deter feeding insects nematodes and fungal and bacterial pathogens plants have evolved a plethora of defence strategies. A central player in many of these defence responses is jasmonic acid. It is the aim of this minireview to summarize recent findings that highlight the role of jasmonic acid during programmed cell death plant defence and leaf senescence. Correspondence C. Reinbothe Lehrstuhlfur Pflanzenphysiologie Universitat Bayreuth Universitatsstrasse 30 D-95447 Bayreuth Germany Fax 49 921 75 77 442 Fax 49 921 55 26 34 E-mail Received 7 November 2008 revised 29 June 2009 accepted 2 July 2009 doi Introduction Oxygenated fatty acid-derivatives oxylipins are central players in a variety of physiological processes in plants and animals. Jasmonic acid JA in particular accomplishes unique roles in plant developmental processes and defence. It has been shown to regulate flower development embryogenesis seed germination fruit ripening and leaf senescence 1-3 . JA is also involved in wound responses and defence 4-7 . Pioneering work from Zenk s group has shown that several fungal pathogens and elicitors promote JA accumulation in cell cultures of Petroselinum hortense Eschscholtzia californica Rauvolfia canescens and Glycine max 8

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