棉花幼苗对不同程度低温逆境的生理响应
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国家“十一五”科技支撑项目(2009BADA4B01-3)


Physiological Responses of Cotton Seedlings under Low Temperature Stress
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    摘要:

    以‘新陆早33号’(冷敏感)和‘中棉所50号’(高耐寒)棉花品种为材料,采用人工模拟低温方法,研究不同温度和时间处理下棉花幼苗叶片抗氧化酶活性和渗透调节物质含量的响应特征,探讨不同温度胁迫下棉花的抗逆机制。结果显示:(1)随胁迫温度降低、胁迫时间延长,两参试棉花品种幼苗遭受低温伤害的程度逐渐加剧,尤以5 ℃和0 ℃处理表现最为明显。(2)经15 ℃及10 ℃处理后,植株叶片REC、POD活性、SP和Pro含量总体上随胁迫时间延长而提高,MDA含量、APX活性和SS含量则先升后降,并均于处理24 h时达峰值;而在5 ℃及0 ℃处理下,REC和SOD、POD活性以及MDA、SS、SP含量迅速上升,APX活性、Pro含量则呈先升后降的变化趋势。(3)与‘新陆早33号’相比,‘中棉所50号’在各处理水平下均可保持更大的抗氧化酶活性和渗透调节物质含量上升幅度。研究表明,在不同程度低温逆境中,棉花幼苗可通过调节抗氧化酶活性和渗透调节物质含量,启动相应抗逆调节方式来维持代谢平衡,增强抗逆性;高耐寒性品种在低温逆境中具有更灵敏、高效的活性氧清除能力和渗透调节响应机制,从而有效抵御低温逆境伤害。

    Abstract:

    ‘Xinluzao 33’ (cold sensitive variety) and ‘Zhongmiansuo 50’ (high cold resistant variety) were selected as test materials in this study.The change of activity of antioxidant enzyme activities and osmotic adjustment substance contents in leaves of seedling were determined under simulating different stress-temperature gradient and time gradient of low temperature stress.The results showed that:(1)The responses to low temperature stress in two cotton cultivars intensified gradually with the decline of temperature and treatment period time,especially 15 ℃ and 10 ℃.(2)With prolonging of stress time,the relative electric conductivity (REC),POD activity,SP and Pro content of cotton leaves generally increased after 15 ℃ and 10 ℃ treatment,the variation trend in activity of POD and APX,content of MDA and SS was increased firstly until 24 h treatment.Under 5 ℃ and 0 ℃ treatment,REC,the activities of SOD and POD,the contents of MDA,SP and SS were increased significantly,the variation trend of APX and Pro increased to a certain degree and then decreased.(3)Compared with ‘Xinluzao 33’,the activities of antioxidant enzymes and the contents of osmotic adjustment substances of ‘Zhongmiansuo 50’ rose more steeply.Those results indicated that,under varying degree of low temperature stress,cotton seedlings could start the appropriate adjustment method to maintain the metabolic balance,and to improve resistance by the regulation and adaption of different indicators of antioxidant enzymes and osmotic adjustment substances.High cold resistant varieties could start the response mechanism of scavenging free radicals and osmotic regulation more rapidly and sensitively,which would enhance chilling adaptability.

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武 辉,张巨松,石俊毅,等.棉花幼苗对不同程度低温逆境的生理响应[J].西北植物学报,2013,33(1):74-82

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  • 在线发布日期: 2013-04-17
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