Dose-Dependent Effects of Coronatine on Cotton Seedling Growth Under Salt Stress----中国科学院遗传发育所农业资源研究中心

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论文题目	Dose-Dependent Effects of Coronatine on Cotton Seedling Growth Under Salt Stress
作　　者	ZhiXia Xie（谢志霞）, LiuSheng Duan, ZhaoHu Li, XiaoDong Wang, Xiaojing Liu（刘小京）;
发表年度	2015
刊物名称	Journal of Plant Growth Regulation
卷、期、页码	Published online; ;
影响因子
论文摘要	Coronatine (COR) is a chlorosis-inducing, nonhost-specific phytotoxin produced by several members of the Pseudomonas syringae group of pathovars. It acts as a molecular mimic of methyl jasmonate. This study investigated the dose-dependent effects of COR on cotton seedling (Gossypium hirsutum L. cv. CCRI 45) growth under normal or salt-stressed conditions. The results demonstrated that salt stress inhibited growth of cotton seedlings, decreased chlorophyll content and net photosynthesis, altered activity of antioxidant enzymes (Superoxide dismutase, Catalase, and peroxidases), and ion balance within the stressed seedlings. Pretreatment with a low concentration of COR (0.01 lmol/L) increased seedling biomass under unstressed and salt-stressed conditions by increasing chlorophyll contents, net photosynthesis and PSII function, elevating the activity of antioxidative enzymes and protein content, improving Na? exclusion, K? retention, and the K?/Na? ratio, and reducing lipid peroxidation causing membrane damage. However, high concentrations of COR (1 lmol/L) decreased seedling biomass under unstressed conditions, and exacerbated the above-mentioned adverse effects of salt stress by inhibiting the activity of antioxidative enzymes and photosynthesis, enhancing chlorophyll degradation and lipid peroxidation causing membrane damage. These results indicated that COR has dose-dependent effects on cotton growth. A low concentration (0.01 lmol/L) of COR improved seedling growth and alleviated the inhibition due to salt stress. However, a higher concentration (1 lmol/L) of COR inhibited seedling growth and aggravated salt stress in cotton seedling under salt-stressed conditions.
全文链接	http://dx.doi.org/10.1007/s00344-015-9501-1
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