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Plant and Cell Physiology Advance Access originally published online on July 3, 2007
Plant and Cell Physiology 2007 48(8):1148-1158; 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 email: 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, PR China
2Graduate School of Chinese Academy of Sciences, Beijing 100039, PR China

*Corresponding author: E-mail, cyli{at}genetics.ac.cn; Fax, +86-10-6487-3428.


  Abstract

The molecular mechanism governing the response of plants 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 in 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 the nucleus. Taken together, these results demonstrated that AtSZF1 and AtSZF2 negatively regulate the expression of salt-responsive genes and play important roles in modulating the tolerance of Arabidopsis plants to salt stress.

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

Abbreviations: ABRE, ABA-responsive element; C3H-ZnF, CCCH-type zinc finger motif; CCCH, C-x8-C-x5-C-x3-H; DRE, dehydration- or salt stress-responsive element; GUS, ß-glucuronidase; GFP, green fluorescent protein; RT–PCR, reverse transcription–PCR; 35S, cauliflower mosaic virus 35S RNA promoter

(Received May 12, 2007; Accepted June 26, 2007)
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