%0 Journal Article
%T The physiological and molecular mechanisms of calcium uptake, transport, and metabolism in plants.<br>植物钙吸收、转运及代谢的生理和分子机制
%A Wei Zhou
%A Hong Wang
%A <br>周卫
%A 汪洪
%J 植物学报
%D 2007
%I 
%X Calcium is an essential plant nutrient. Calcium deficiency may occur in acidic soils with low base saturation. Since the transpiration from enclosed tissues and fruit is low, Ca deficiency readily develops in fruit trees and vegetables with enclosed tissues or fruit. Calcium may traverse the root through an apoplastic or symplastic pathway. Calcium is also believed to be directly taken up by an actual fruit with a non-vascular bundle structure. At the molecular level, Ca enters plant cells through Ca2+-permeable ion channels in their plasma membranes, whereas low Ca2+] in unstimulated cells is maintained by Ca2+-ATPase and Ca2+/H+ antiporters. The rapid influx of Ca2+ through cation channels in the plasma membranes, tonoplast and/or endoplasmic reticulum generates transient elevation and oscillation of Ca2+]cyt that initiate cellular responses to a diverse range of developmental cues and environmental challenges. The cellular Ca2+]cyt sensors include calmodulin, calcium-dependent protein kinases and calcineurin B-like proteins that allow plant cells to respond appropriately to Ca2+]cyt signals. This article provides an overview of the mechanisms of Ca2+ transport across cellular membranes, the origins and specificity of Ca2+]cyt signals and the characteristics of cellular Ca2+]cyt sensors.
%K <br>生理缺钙
%K 钙运输蛋白
%K 钙吸收
%K 钙信号靶蛋白
%K 胞质钙信号
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=97AE3D0EBF25E42C466FEF50E492F710&aid=3FD342777E52A5D7DF4BDCAE7C8537DD&yid=A732AF04DDA03BB3&vid=B91E8C6D6FE990DB&iid=B31275AF3241DB2D&sid=1CBB73E9593E8833&eid=0358FC3DBCE8E14D&journal_id=1674-3466&journal_name=植物学报&referenced_num=0&reference_num=129