Overexpression of CaHSP26 in transgenic tobacco alleviates photoinhibition of PSII and PSI during chilling stress under low irradiance

文献类型： 外文期刊

第一作者： Guo, Shang-Jing

作者： Guo, Shang-Jing;Zhou, Hai-Yan;Zhang, Xian-Sheng;Li, Xin-Guo;Meng, Qing-Wei

作者机构：

关键词： chilling stress under low irradiance;chloroplast small heat shock protein;photoinhibition;sweet pepper;transgenic tobacco

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

ISSN： 0176-1617

年卷期： 2007 年 164 卷 2 期

页码：

收录情况： SCI

摘要： A sweet pepper cDNA clone, CaHSP26 encoding the chloroplast (CP)-localized small heat shock protein (sHSP), was isolated and characterized with regard to its sequence, response to various temperatures and function in transgenic tobacco plants. The deduced amino acid sequence contained three highly conserved regions, showing high identities with other plant sHSPs. Expression of the CaHSP26 gene showed that the mRNA accumulation of CaHSP26 was induced by heat stress. Higher transcript levels were observed when sweet pepper leaves were treated at 42 degrees C for 3 h. However, the expression of the CaHSP26 gene was not induced by chilling stress (4 degrees C) in the absence of heat shock (HS). But the transcripts were still detected at 48 h at 4 degrees C after HS while not at 25 degrees C. The photochemical efficiency of PSII (Fv/Fm) and the oxidizable P700 in transgenic tobacco overexpressing CaHSP26 were higher than that in wild type tobacco during chilling stress under low irradiance. These results suggest that CP sHSP protein plays an important role in protection of PSII and PSI during chilling stress under low irradiance. (c) 2006 Elsevier GmbH. All rights reserved.

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