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JXB Advance Access published online on September 20, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm184
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© 2007 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

High-level overexpression of the Arabidopsis HsfA2 gene confers not only increased themotolerance but also salt/osmotic stress tolerance and enhanced callus growth

Daisuke Ogawa1, Kazuo Yamaguchi1,2 and Takumi Nishiuchi1,2,*

1Division of Functional Genomics, Advanced Science Research Center, Kanazawa University, 13-1 Takaramachi, Kanazawa 920-0934, Japan
2Division of Life Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan

* To whom correspondence should be addressed. E-mail tnish9{at}kenroku.kanazawa-u.ac.jp

Heat shock transcription factors (Hsfs) are the central regulators of the heat shock (HS) stress response in all eukaryotic organisms. HsfA2 is one of the Arabidopsis class A Hsfs, and the induction of HsfA2 expression in response to HS stress is highest among all 21 Arabidopsis Hsfs. In this study, it is reported that basal and acquired thermotolerance was significantly enhanced in high-level HsfA2-overexpressed transgenic lines (El2{Omega}::HsfA2) in comparison with wild-type plants. By contrast, the dominant negative mutants of HsfA2 (El2{Omega}::HsfA2{Delta}C264) plants displayed reduced thermotolerance. These results indicate that the HsfA2 gene plays a role in the HS stress response. Microarray analysis of the El2{Omega}::HsfA2 plants identified putative target genes, which included HS stress-inducible genes and other stress-responsive genes. Salt and osmotic stress induced HsfA2 gene expression. In fact, the El2{Omega}::HsfA2 plants showed enhanced tolerance to these stresses, suggesting that HsfA2 was involved in multiple stress tolerance. El2{Omega}::HsfA2 plants showed accelerated callus growth from root explants compared with the wild type, unlike the El2{Omega}::HsfA2{Delta}C264 plants whose growth was delayed. These observations suggest that HsfA2 plays, in addition to its role in stress tolerance, an important role in cell proliferation.

Key words: Biomass, callus, heat shock response, Hsf, microarray, osmotic stress, salt stress

Received 23 May 2007; Revised 3 July 2007 Accepted 16 July 2007


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