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Plant and Cell Physiology Advance Access published online on July 3, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm088
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

The CCCH-Type Zinc Finger Proteins AtSZF1 and AtSZF2 Regulate Salt Stress Responses in Arabidopsis

Jiaqiang Sun1, Hongling Jiang1, Yingxiu Xu1,2, Hongmei Li1,2, Xiaoyan Wu1, Qi Xie1 and Chuanyou Li1

1State Key Laboratory of Plant Genomics and Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
2Graduate School of Chinese Academy of Sciences, Beijing 100039, China

Corresponding author: Chuanyou Li, Mailing address: Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, No. 5 Datun Road, Chaoyang District, Beijing 100101, China. Tel: (+8610) 6486 5313, Fax: (+8610) 6487 3428, E-mail: cyli{at}genetics.ac.cn


  Abstract

The molecular mechanism governing the response of plant to salinity stress, one of the most significant limiting factors for agriculture worldwide, has just started to be revealed. Here, we report AtSZF1 and AtSZF2, two closely related CCCH-type zinc finger proteins, involved in salt stress responses in Arabidopsis. The expression of AtSZF1 and AtSZF2 is quickly and transiently induced by NaCl treatment. Mutants disrupted the expression of AtSZF1 or AtSZF2 exhibit increased expression of a group of salt stress responsive genes in response to high salt. Significantly, the atszf1-1/atszf2-1 double mutant displays more sensitive responses to salt stress than the atszf1-1 or atszf2-1 single mutants and wild-type plants. On the other hand, transgenic plants overexpressing AtSZF1 show reduced induction of salt stress responsive genes and are more tolerant to salt stress. We also showed that AtSZF1 is localized in nucleus. Taken together, these results demonstrated that AtSZF1 and AtSZF2 negatively regulate salt-responsive genes expression and play important roles in modulating plant tolerance to salt stress in Arabidopsis.

Keywords: Arabidopsis - CCCH-type zinc finger protein - AtSZF1 and AtSZF2 - Salt stress


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