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A combinatorial strategy to identify various types of QTLs for quantitative traits using extreme phenotype individuals in an F_(2)population

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Plant Communications 2022年第3期3卷 127-141页

作者： Pei Li Guo Li Ya-Wen Zhang Jian-Fang Zuo Jin-Yang Liu Yuan-Ming Zhang Crop Information Center College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China Jiangsu Key Laboratory for Horticultural Crop genetic Improvement Institute of Industrial CropsJiangsu Academy of Agricultural SciencesNanjing 210014China

Theoretical and applied studies demonstrate the difficulty of detecting extremely over-dominant and smalleffect genes for quantitative traits via bulked segregant analysis(BSA)in an F_(2)*** address this issue,we proposed an integrated strategy for mapping various types of quantitative trait loci(QTLs)for quantitative traits via a combination of BSA and whole-genome *** this strategy,the numbers of read counts of marker alleles in two extreme pools were used to predict the numbers of read counts of marker *** observed and predicted numbers were used to construct a new statistic,G_(w),for detecting quantitative trait genes(QTGs),and the method was named *** method was significantly better than existing BSA *** the goal was to identify extremely over-dominant and smalleffect genes,another reserved DNA/RNA sample from each extreme phenotype F_(2)plant was sequenced,and the observed numbers of marker alleles and genotypes were used to calculate G_(w)to detect QTGs;this method was named *** simulated and real rice dataset analyses,dQTG-seq2 could identify many more extremely over-dominant and small-effect genes than BSA and QTL mapping ***2 may be extended to other heterogeneous mapping *** significance threshold of G_(w)in this study was determined by permutation *** addition,a handbook for the R software ***,which is available at https://***/web/packages/***/***,has been provided in the supplemental materials for the users’*** study provides a new strategy for identifying all types of QTLs for quantitative traits in an F_(2)population.

关键词： F_(2) bulked segregant analysis dQTG-seq extremely over-dominant gene small-effect gene rice

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