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JXB Advance Access published online on November 7, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri302
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received February 16, 2005
Accepted September 2, 2005

RESEARCH PAPER

Functional analysis of a putative Ca2+ channel gene TaTPC1 from wheat

Yu-Jun Wang 1, Jia-Ning Yu 2, Tao Chen 1, Zhi-Gang Zhang 1, Yu-Jun Hao 1, Jin-Song Zhang 1*, and Shou-Yi Chen 1

1 National Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
2 National Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; Present address: College of Life Sciences, Shanxi Normal University, Xian 710062, China

* To whom correspondence should be addressed.
Jin-Song Zhang, E-mail: jszhang{at}genetics.ac.cn


  Abstract

The cytosolic free-calcium concentration [Ca2+](cyt) transiently increases under abiotic stresses and the proteins that control this process are gradually disclosed. The Ca2+-permeable channel is one type of these proteins in plants. In the present study, a novel Ca2+-permeable channel gene TaTPC1 encoding a putative membrane protein was cloned from wheat. It was induced under high salinity, polyethylene glycol, low temperature (4 °C), and abscisic acid. Expression of TaTPC1 in the yeast mutant lacking CCH1 can recover its growth under lithium stress through functional complementation. TaTPC1 transgenic plants exhibited more stomatal closing in the presence of Ca2+ than the control, supporting a role for the calcium channel in regulating plant responses to environmental change.

Keywords: Calcium channel; stomatal closing; stress induction; transgenic plants; wheat.
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