Salicylic acid-induced enhancement of cold tolerance through activation of antioxidative capacity in watermelon
Salicylic acid-induced enhancement of cold tolerance through activation of antioxidative capacity in watermelon
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水杨酸通过激活西瓜的抗氧化能力诱导增强耐寒性
DOI：
10.1016/j.scienta.2008.06.015
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发表时间：
2008-10-01
影响因子：
4.3
通讯作者：
Ming-Fang, Zhang
中科院分区：
文献类型：
--
作者：
Jing-Hua, Yang;Yuan, Gao;Ming-Fang, Zhang
本研究旨在确定耐寒种质选育的适宜温度，探讨外源SA对西瓜耐寒性的影响。结果表明，低温（10℃）是西瓜耐寒种质最适宜的鉴定温度。此外，我们还对4种不同西瓜种质的抗寒能力进行了分类，其中9号为抗寒能力最强的种质，2号为抗寒敏感性最强的种质。适宜外源SA （1.0 mmol/L）通过激活G-POD、ASA-POD、CAT、SOD和GR等抗氧化能力，增强了西瓜的抗寒性。适宜外源SA （1.0 mmol/L）处理后，西瓜抗寒种质9号的抗氧化酶活性显著高于冷敏种质2号，但2号的抗氧化酶活性也有所增强。然而，高浓度的外源SA降低了西瓜抗氧化酶的活性，从而削弱了西瓜的耐寒能力。(C) 2008 Elsevier B.V.版权所有
The purpose of this study is to determine suitable temperature for selecting germplasm with cold tolerance and to investigate the effects of exogenous SA on cold tolerance in watermelon. We found that low temperature (10 degrees C) was the most suitable temperature to identify cold tolerance germplasm in watermelon. Moreover, we classified the capacities of four different watermelon germplasms, of which No. 9 was the germplasm with strongest cold tolerance and No. 2 was the one with chilling sensitiveness. The suitable exogenous SA (1.0 mmol/L) enhanced cold tolerance in watermelon through activations of antioxidative capacity, Such as, G-POD, ASA-POD, CAT, SOD and GR. The activities of antioxidative enzymes were more significantly increased in cold tolerance germplasm No. 9 than that in chilling sensitive germplasm No. 2 in watermelon after being treated with suitable exogenous SA (1.0 mmol/L), although they were also been enhanced in No. 2. However, higher concentration of exogenous SA decreased the activity of antioxidative enzymes, consequently, weakened the capacity of cold tolerance in watermelon. (C) 2008 Elsevier B.V. All rights reserved.