低温对孕穗期玉米根系生理特性的影响

胡文河; 于飞; 谷岩; 杨溢; 闫丽; 吴春胜

doi:10.7671/j.issn.1001-411X.2014.04.006

低温对孕穗期玉米根系生理特性的影响

Effects of low temperature on physiological characteristics of maize root at booting stage

摘要

摘要: 【目的】探讨玉米孕穗期根系对低温的生理响应机制，分析不同低温胁迫时间下，玉米根系生理指标的动态变化规律，以期为玉米抗低温冷害生理研究提供重要的理论依据. 【方法】以2种耐寒性不同的玉米品种先玉335和东单213为试验材料，于孕穗初期(出苗后第45天)移至人工气候室内进行低温处理，研究低温对孕穗期玉米根系保护酶活性及相关生理性状的影响，并对各项生理指标的相关性进行分析.【结果和结论】随着低温胁迫时间的延长，先玉335的平均SOD、POD和CAT活性以及脯氨酸（Pro）、可溶性蛋白和可溶性糖含量均高于东单213，丙二醛（MDA）含量则相反.相关分析表明，先玉335根系活力与SOD活性和可溶性糖含量呈极显著正相关；东单213根系活力与CAT活性呈显著正相关；2个品种根系活力均与Pro含量呈显著正相关，与MDA含量呈显著负相关.

Abstract: 【Objective】 Effects of low temperature on physiological characteristics of maize root at booting stage were studied.【Method】 Xianyu335 and Dongdan213 were selected as the tested materials, and the effects of low temperature on physiological characteristics of maize root at booting stage, and the correlations of all physiological indicators were studied.【Result and conclusion】 The results showed that the activities of SOD, POD, CAT and the contents of Pro, soluble protein and sugar of Xianyu335 were higher than those of Dongdan213 with the prolongation of the low temperature stress time, and MDA content showed the opposite changes. The correlation analysis showed that there was a significant positive correlation between root activity and SOD activity, soluble sugar content in Xianyu335, and there was a significant positive correlation between root activity and CAT activity in Dongdan213. Root activity was positively correlated with the content of Pro, and negatively correlated with MDA content.

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