TAILIEUCHUNG - Báo cáo khoa hoc : Calcium-permeable channels in plant cells

Calcium signal transduction is a central mechanism by which plants sense and respond to endogenous and environmental stimuli. Cytosolic Ca 2+ ele-vation is achieved via two cellular pathways, Ca 2+ influx through Ca 2+ channels in the plasma membrane and Ca 2+ release from intracellular Ca 2+ stores. | IFEBS Journal MINIREVIEW Calcium-permeable channels in plant cells Fabien Jammes1 Heng-Cheng Hu1 Florent Villiers1 Roxane Bouten1 and June M. Kwak1 2 3 1 Department of CellBiology and Molecular Genetics University of Maryland College Park USA 2 Department of Plant Science and Landscape Architecture University of Maryland College Park USA 3 Department of Plant Molecular Systems Biotechnology and Crop Biotech Institute Kyung Hee University Yongin Korea Keywords calcium development hormonalresponse ion channel signal transduction Correspondence Fabien Jammes June M. Kwak Department of CellBiology and Molecular Genetics University of Maryland College Park MD 20742 USA Fax 1 301 314 1248 Tel 1 301 405 9726 E-mail fjammes@ jkwak@ Received 28 April 2011 revised 12 July 2011 accepted 4 August 2011 doi Calcium signal transduction is a central mechanism by which plants sense and respond to endogenous and environmental stimuli. Cytosolic Ca2 elevation is achieved via two cellular pathways Ca2 influx through Ca2 channels in the plasma membrane and Ca2 release from intracellular Ca2 stores. Because of the significance of Ca2 channels in cellular signaling interaction with the environment and developmental processes in plants a great deal of effort has been invested in recent years with regard to these important membrane proteins. Because of limited space in this review we focus on recent findings giving insight into both the molecular identity and physiological function of channels that have been suggested to be responsible for the elevation in cytosolic Ca2 level including cyclic nucleotide gated channels glutamate receptor homologs two-pore channels and mechanosensitive Ca2 -permeable channels. We provide an overview of the regulation of these Ca2 channels and their physiological roles and discuss remaining questions. Introduction The regulation of Ca2 flux is a keystone of the integration of environmental signals and their .

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