《植物生理学报》 2014, 50(5): 660-664

低温胁迫下棉花幼苗对外源水杨酸的生理响应

辛慧慧, 李防洲, 侯振安, 冶军*, 康文晶, 罗建

石河子大学农学院, 新疆石河子832000

通信作者：冶军；E-mail: yejun.shz@163.com；Tel: 13309930077

摘　要：

以棉花幼苗为试材, 通过叶面喷施不同浓度水杨酸的处理方法, 研究外源水杨酸对低温胁迫下棉花幼苗的缓解效应。结果表明, 0.6~0.8 mmol·L^-1水杨酸预处理可以显著降低棉花幼苗叶片相对电导率(REC)和丙二醛(MDA)的积累量, 从而缓解低温对质膜的过氧化伤害, 并通过提高超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)的活性和可溶性糖、可溶性蛋白、脯氨酸等渗透调节物质的含量来适应低温环境。

关键词：棉花幼苗; 水杨酸; 低温胁迫; 生理响应

收稿：2014-01-08   修定：2014-03-06

资助：国家科技支撑计划(2012BAD20B03)。

Physiological Response of Cotton (Gossypium hirsutum L.) Seedling to Exogenous Salicylic Acid under Low Temperature Stress

XIN Hui-Hui, LI Fang-Zhou, HOU Zhen-An, YE Jun*, KANG Wen-Jing, LUO Jian

College of Agriculture, Shihezi University, Shihezi, Xinjiang 832000, China

Corresponding author: YE Jun; E-mail: yejun.shz@163.com; Tel: 13309930077

Abstract:

Alleviating effect of exogenous salicylic acid on the cotton seedling under low temperature stress was elucidated by foliar-sprayed with different concentrations of salicylic acid. The results showed that 0.6–0.8 mmol·L^-1 salicylic acid pretreatment could significantly reduce the accumulation of the relative conductivity (REC) and malondialdehyde (MDA) content in the cotton seedling, which alleviated the oxidative damage of low temperature on plasma membrane. And the salicylic acid pretreatment could improve the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and the contents of soluble sugar, soluble protein, proline to adapt to low temperature environment.

Key words: cotton (Gossypium hirsutum) seedling; salicylic acid; low temperature stress; physiological response