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Plant and Cell Physiology Advance Access published online on August 31, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj099
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© The Author 2006. 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
Received May 9, 2006
Accepted July 26, 2006

Regular Paper

The Arabidopsis Mutant stg1 Identifies a Function for TBP-associated Factor 10 in Plant Osmotic Stress Adaptation

Xiang Gao 1, Feng Ren 1, and Ying-Tang Lu 1 *

1 Key Laboratory of MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan 430072, China

* To whom correspondence should be addressed.
Ying-Tang Lu, E-mail: yingtlu{at}whu.edu.cn


  Abstract

Plant salt tolerance is a complex trait involving many genes. To identify new salt tolerance determinants during seed germination, we have screened a population of chemically inducible activation tagged Arabidopsis mutants. A mutant, designated stg1 (salt tolerance during germination 1), was obtained. stg1 mutant is less sensitive than WT for NaCl and osmotic stress inhibition of germination in the presence of the inducer. Germination assays on media containing various salts upon inducer application indicate that the stg1 mutation enhances tolerance to Na+ and K+. Under salt stress, stg1 maintains higher K+/Na+ ratio and accumulates less proline than WT control, suggesting its salt tolerance mechanisms mainly involved in the regulation of ion balance. STG1 encodes a putative Arabidopsis TATA box-binding protein (TBP)-associated factor 10 (atTAF10), which constitutes the transcriptional factor IID (TFIID) complex. Overexpression of atTAF10 under the control of 35S promoter in Arabidopsis improves seed tolerance to salt stress during germination and the knocked-down mutant is more sensitive to salt stress, indicating the transcription initiation factor as a physiological target of salt toxicity in plants.

Keywords: Arabidopsis; Salt tolerance; Seed germination; Stress adaptation; TAF10; TBP-associated factor.
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