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

作　　者：黄海[1] 常莹[1] 刘雪梅[2] 胡文河[1] 吴春胜[1] 谷岩[1] 

机构地区：[1]吉林农业大学农学院,吉林长春130118 [2]通化市东昌区农业局,吉林通化134000

出　　处：《华南农业大学学报》2014年第5期36-41,共6页Journal of South China Agricultural University

基　　金：国家自然科学基金(31000687);国家粮食丰产工程项目(2011BAD16B10;2012BAD04B02);吉林省现代农业产业技术体系建设项目(201403);吉林省科技支撑计划项目(20130305032NY);吉林省科技发展计划项目(20116030)

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.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 meas-ured, 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 Zhengdan 958 were the biggest , while Xianyu335 had a higher protective activities .

关 键 词：玉米 根系特征 保护酶活性 群体密度 

分 类 号：S513.01[农业科学—作物学]