四川农业大学学报2025，Vol.43Issue(4)：959-966,8.DOI:10.16036/j.issn.1000-2650.202504567
水旱条件下玉米不同性状的全基因组选择分析
Genomic Selection of Different Traits in Maize under Well-Watered and Water-Stressed Conditions
摘要
Abstract
[Objective]This study aimed to evalute the phenotypes of maize inbred lines under both well-watered and drought-stressed conditions,and to integrate genomic selection analysis,in order to fa-cilitate molecular screening of drought-tolerant germplasms and support breeding for drought-resistant varieties.[Method]A training population comsising of 175 maize inbred lines was established.Over two consecutive years and across two locations,four phenotypic traits-plant height,ear height,tassel branch number,and yield-were measured under contrasting water regimes.Genomic selection was conducted us-ing genotypic data and 13 different prediction models.[Result]Phenotypic evaluation revealed reduc-tions in all four traits under drought conditions,with the most significant reduction in yield(24.13%)and the smallest in ear height(6.25%).Genomic selection results showed that the Support Vector Regres-sion(SVR)model achieved the highest prediction accuracy for yield.Under well-watered conditions,SVR prediction accuracies for plant height,ear height,tassel branch number,and yield were 0.595,0.331,0.624,and 0.524,respectively;under water-stressed conditions,the corresponding accuracies were 0.592,0.364,0.631,and 0.490.The drought tolerance index exhibited the lowest prediction accuracy(0.196).[Conclusion]The Support Vector Regression(SVR)model outperformed the other 12 genomic selection models in predicting the target traits.Optimal genomic prediction performance was achieved when the training population size constituted 50%of the total population and 500 SNP markers were utilized.关键词
玉米/耐旱指数/表型鉴定/全基因组选择Key words
maize/drought tolerance index/phenotypic evaluation/genomic selection分类
农业科技引用本文复制引用
李昊洋,宋莹璐,张鹏艳,张正,温鑫,卜华虎,常建忠..水旱条件下玉米不同性状的全基因组选择分析[J].四川农业大学学报,2025,43(4):959-966,8.基金项目
山西省重点研发计划(202102140601002) （202102140601002）
中央引导地方发展资金(YDZJSX2022A036) （YDZJSX2022A036）
山西省科技重大专项计划子课题(202201140601025-1-03) （202201140601025-1-03）
山西农业大学生物育种工程(YZGC146) （YZGC146）
山西省现代农业产业技术体系建设专项(2023CYJSTX01-09). （2023CYJSTX01-09）
