作物学报2024，Vol.50Issue(1)：172-186,15.DOI:10.3724/SP.J.1006.2024.33019
长江中下游地区糯玉米花期耐热性鉴定及评价指标筛选
Identification of heat tolerance of waxy maizes at flowering stage and screening of evaluation indexes in the middle and lower reaches of Yangtze River region
摘要
Abstract
Heat stress has acknowledged as one of the major threats to waxy maize production as a result of global warming gradually seriously.Heat resistance identification and indices screening could provide the theoretical basis in breeding heat-resistant cultivars.In the present study,13 heat-related parameters of 10 waxy maize cultivars from the middle and lower reaches of Yangtze River area were measured under normal temperature treatment(CK)and two heat stress treatments(artifi-cial warming treatment and delayed sowing treatment).Principal component analysis,membership function method,cluster analysis,and stepwise regression analysis were used to comprehensively evaluate the heat resistance of waxy maize at flower-ing stage.The results showed that most indices under heat stress decreased significantly compared with CK,except for chlo-rophyll a and PS Ⅱ primary light energy conversion efficiency.Three independent comprehensive components were obtained from 13 single traits using a principal component analysis,and their contribution rates respectively were 64.46%,15.06%,and 7.76%,which represented 87.28%information of the original data.Ten testing cultivars were divided into three heat-tolerance types that were heat tolerance category,medium heat tolerance category,and high temperature sensitive category based on comprehensive heat tolerance values(D)calculating by membership function methods.SYN2,ZN2,and SYN901 were identi-fied as the heat-resistant cultivars,and planting these cultivars could partly alleviate the negative effects of heat stress on waxy maize production.Finally,stepwise regression method was used to establish a predictive equation to evaluate heat tolerance,which indicating that predictive values(PV)calculated by the predictive equation were basically consistent with D value.The results showed that yield,Fv/Fm,leaf area index,and pollen viability could be used to identify heat-resistant cultivars of waxy maize.The heat tolerant cultivars and identification index selected in the study could serve as a basis for subsequent breeding heat tolerant cultivars of waxy maize.关键词
糯玉米/花期耐热性/综合评价/鉴定指标Key words
waxy maize/heat-tolerance at flowering stage/comprehensive assessment/evaluation indexes引用本文复制引用
宋旭东,石明亮,薛林,周桂生,郝德荣,朱广龙,张舒钰,章慧敏,周广飞,张振良,冒宇翔,陆虎华,陈国清..长江中下游地区糯玉米花期耐热性鉴定及评价指标筛选[J].作物学报,2024,50(1):172-186,15.基金项目
本研究由江苏省种业振兴揭榜挂帅项目(JBGS[2021]054),江苏省重点研发项目(BE2021317),南通市基础科学研究项目(JC12022088),江苏省自主创新项目(CX(20)1002)和江苏现代农业产业技术体系建设专项资助. This study was supported by the Open Competition Project of Seed Industry Revitalization of Jiangsu Province(JBGS[2021]054),the Jiangsu Province Key Research and Development Project(BE2021317),the Scientific and Technological Project of Nantong City,China(JC12022088),the Jiangsu Agriculture Science and Technology Innovation Fund(CX(20)1002),and the Earmarked Fund for Jiangsu Agri-cultural Research System. （JBGS[2021]054）
