Wheat genotypes tolerant to heat at seedling stage tend to be also tolerant at adult stage:The possibility of early selection for heat tolerance breeding

作     者：Lu Lu Hui Liu Yu Wu Guijun Yan Lu Lu;Hui Liu;Yu Wu;Guijun Yan

作者机构：UWA School of Agriculture and EnvironmentThe University of Western AustraliaPerthWA 6009Australia The UWA Institute of AgricultureThe University of Western AustraliaPerthWA 6009Australia Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041SichuanChina 

出 版 物：《The Crop Journal》 (作物学报（英文版）)

年 卷 期：2022年第10卷第4期

页      面：1006-1013页

核心收录：

学科分类：0710[理学-生物学] 09[农学] 0901[农学-作物学] 

基　　金：funded by the Global Innovation Linkages Project(GIL53853)from the Australian Department of Industry Science Energy and Resources. 

主　　题：Heat tolerance Seedling stage Adult stage Linear regression Genetic mechanism 

摘      要：Wheat production is seriously influenced by extreme hot weather,which has attracted increasing attention.It is important to compare wheat responses to heat at seedling and reproductive stages,to explore the potential relationship between the performances at different growing stages and the possibility of early selection to accelerate heat tolerance breeding.In this study,forty wheat genotypes were screened under heat stress at both seedling and adult stages.It was found that root lengths at seedling stage were severely reduced by heat stress with significant variations among wheat genotypes.Heat-tolerant genotypes at seedling stage showed less root length decrease than susceptible ones.Wheat genotypes tolerant at seedling stage showed higher yield at adult stage after heat treatment.The performances of wheat genotypes screened under heat stress at seedling and adult stages were ranked by seedling damage index and adult damage index.A significant positive relationship was found between heat tolerance at seedling stage and at adult stage(r=0.6930),suggesting a similar tolerant/susceptible mechanism at different plant growth stages and the possibility of early selection at seedling stage for breeding heat tolerance.Extremely tolerant and susceptible genotypes with consistent performances at seedling and adult stages were genetically compared and associated SNP markers and linked candidate genes were identified.