Rind penetrometer resistance(RPR)is an important index that can be used to measure mechanical strength and lodging-resistance capability of maize stalk.In this study,a total of 198 recombinant inbred lines developed from waxy maize inbred lines Hengbai 522 and Tongxi 5 were used as test materials to perform quantitative trait locus(QTL)analysis and genomic selection(GS)study of RPR.Four QTLs for waxy maize PRP were detected by individual en-vironmental QTL analysis,and contribution rate of phenotypic variation for each QTL was below 10.00%and was detected only in individual environment.Eight QTLs were detected to interact with the environment by multiple environmental QTL analysis,the additive effect could explain a total of 24.64%phenotypic variations,and the contribution rate of interaction between additive QTL and environment was 17.51%.Four pairs of QTL-QTL interactions were detec-ted by epistatic QTL analysis,which could explain 8.25%of the phenotypic variation.In GS,when the training pop-ulation size occupied 80%of the total population size,a relatively high prediction accuracy could be obtained by selecting 500 markers randomly.However,the genome selection prediction accuracy could be significantly improved by u-sing top 200 markers for logarithm of odds values based on QTL analysis results of individual environmental.
维普
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