Metabolic responses of alfalfa (Medicago Sativa L.) leaves to low and high temperature induced stresses

文献类型： 外文期刊

第一作者： Mo, Yiwei

作者： Mo, Yiwei;Shi, Weiqi;Xie, Jianghui;Liang, Guobin

作者机构：

关键词： Alfalfa;temperature stress;sucrose;sucrose phosphate synthase (SPS);relative water content

期刊名称：AFRICAN JOURNAL OF BIOTECHNOLOGY （ 影响因子：0.573； 五年影响因子：0.794 ）

ISSN： 1684-5315

年卷期： 2011 年 10 卷 7 期

页码：

收录情况： SCI

摘要： To explore adaptation mechanism of alfalfa to cold and heat stresses, status of sucrose metabolism and relative water content (RWC) in leaves under low and high temperature treatments were studied. Seedlings (35 day old) were transferred to chambers for treatments. First group was subjected to 5 degrees C as low temperature (LT) stress, second group at 33 degrees C as high temperature (HT) stress and third group at 25 degrees C as the control (CK). Results indicated that, both stresses led to an increase in degree and duration of genes expression and corresponding enzymes activities of sucrose phosphate synthase (SPS) and sucrose synthase (SS), but LT showed a more significant effect. As a result, lower starch content and higher contents of soluble reducing sugar, fructose and sucrose were observed under LT stress. Moreover, LT stress lowered malondialdehyde (MDA) content and electrolyte leakage in leaves, thus achieving a higher RWC. It was suggested that, relatively higher RWC in leaves by LT stress resulted from lowered water potential, and transpiration can explain the reason that alfalfa plants are cold-tolerant but heat-sensitive.

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