玉米根系相关特征对群体密度的响应

    The response of maize root characteristics on population density

    • 摘要: 【目的】从玉米根系形态及生理学角度探讨根系对群体密度变化的响应机制.【方法】以益丰29、郑单958、先玉335和先玉420共4个玉米品种为试验材料,通过气生根数目、根系干质量及保护酶活性等指标,分析群体密度对玉米根系基本特征的影响.【结果和结论】过高的群体密度对根系的形态及生理特性存在一定的负效应.随着密度的增加,气生根数量、根系干质量、根系活力均先升高后降低,最大值因品种和生育时期而不同;根系保护酶活性的变化规律则因品种各不相同,但以先玉335最高;随种植密度增加,MDA含量逐渐增加.在气生根数量和根系干质量方面,郑单958表现最好.

       

      Abstract: 【Objective】 The response of maize root characteristics on population density were studied.【Method】 Four maize varieties Yifeng29, Zhengdan958, Xianyu335 and Xianyu420 were used as the tested materials. The number of brace root, dry mass and protective enzyme activities of root were measured, and the effects of population density on basic characteristics of root were determined.【Result and conclusion】 With the increase of population density, the number of brace root, dry mass and root activity increased first and then decreased, and the peaks occurred under different treatments. Protective enzyme activities of root were different with varieties, and MDA contents increased with the increase of population density. The percentage of lodging, the number of brace root and dry mass of root of Zhengdan958 were the biggest, while Xianyu335 had a higher protective activities.

       

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