西南农业学报2026，Vol.39Issue(3)：493-504,12.DOI:10.16213/j.cnki.scjas.2026.3.003
热带亚热带玉米自交系耐密抗倒性鉴定评价
Identification and evaluation of density tolerance and lodging resistance of tropical and subtropical maize inbred lines
摘要
Abstract
[Objective]The study aimed to screen tropical and subtropical maize inbred lines with strong density tolerance,so as to provide theoretical references for breeding density-tolerant maize varieties in the southwestern maize region of China.[Method]52 tropical and sub-tropical maize inbred lines were used as materials,and two planting densities,conventional density(55 000 plants/hm2)and high density(120 000 plants/hm2),were set to analyze effects of planting density on agronomic traits,yield traits,and lodging rate of maize inbred lines.Comprehensive evaluation of density tolerance of the inbred lines was conducted based on density tolerance coefficients,principal component analysis,membership function analysis and cluster analysis.[Result]Compared with conventional density planting conditions,under high density planting conditions,the unit yield,plant height,ear height,and barren ear tip of maize inbred lines all extremely significantly in-creased(P＜0.01,the same as below),while stem diameter,ear length,ear diameter,ear rows,and 100-kernel weight all extremely signifi-cantly decreased.Among the 52 maize inbred lines,45 exhibited a yield density tolerance coefficient greater than 1.000,accounting for 86.50％.Through principal component analysis,nine individual indicators were transformed into five comprehensive principal components,with a cumulative contribution rate of 77.87％.Among them,ear height,ear diameter,100-kernel weight,unit yield,and ear length had a significant influence on density tolerance of maize inbred lines.The membership function method was used to conduct comprehensive evaluation of densi-ty tolerance of maize inbred lines,and with cluster analysis,the 52 inbred lines were classified into three categories:type Ⅰ(strong density tolerance,16 lines,accounting for 30.77％),type Ⅱ(weak density tolerance,13 lines,accounting for 25.00％),and type Ⅲ(moderate density tolerance,23 lines,accounting for 44.23％).Under high-density planting conditions,29 inbred lines(55.77％)showed a lodging rate of 0.Among the 16 inbred lines of strong density tolerance,13(81.25％)had a lodging rate of 0.[Conclusion]The enhancement of maize unit yield lies in increasing planting density.Ear height,ear diameter,100-kernel weight,unit yield,and ear length can serve as main indicators for evaluating density tolerance of maize.The proportion of materials with strong density tolerance and lodging resistance in tropical and subtropical maize inbred lines is relatively high.In the breeding practice of density-tolerant maize,attention should be paid to applying maize inbred lines of strong density tolerance such as GML7322,Hybrid212,GML2020,LV61-2212,LV61-4321 and PR8-1311.关键词
玉米自交系/耐密性/抗倒性/热带亚热带Key words
Maize inbred line/Density tolerance/Lodging resistance/Tropical and subtropical分类
农业科技引用本文复制引用
邹成林,黄开健,黄爱花,莫润秀,翟瑞宁,杨萌..热带亚热带玉米自交系耐密抗倒性鉴定评价[J].西南农业学报,2026,39(3):493-504,12.基金项目
国家重点研发计划项目(2023YFD1201104) （2023YFD1201104）
广西重点研发计划项目(桂农科AB241484001) （桂农科AB241484001）
广西农业科学院基本科研业务专项(桂农科2021YT015) （桂农科2021YT015）
