低温对孕穗期玉米根系生理特性的影响

摘要

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 correla-tions of all physiological indicators were studied .[Result and conclusion] The results showed that the ac-tivities of SOD, POD, CAT and the contents of Pro , soluble protein and sugar of Xianyu335 were higher than those of Dongdan 213 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 correla-tion between root activity and SOD activity , soluble sugar content in Xianyu 335, and there was a signifi-cant positive correlation between root activity and CAT activity in Dongdan 213 .Root activity was positive-ly correlated with the content of Pro , and negatively correlated with MDA content .%【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。