Abstract：Productive tiller number (PTN) is one of the important factors for the yield performance of wheat (Triticum aestivum) and a complex quantitative trait controlled by polygenes. In this case, it is critical to explore the main-effect quantitative trait loci (QTL) and its closely linked molecular markers by the strategies of QTL mapping and meta-analysis in molecular genetic improvement in wheat breeding. In this study, a set of recombinant inbred lines (RIL) of wheat under different water conditions was used to map QTLs for the PTN trait. These identified QTLs were further integrated with reported QTLs for meta-analysis. The results showed that phenotypic values of PTN in the RIL varied widely with significantly transgressive segregation which were sensitive to water stress and thus indicated a low heritability. Under different water conditions, a total of 22 additive QTLs were identified and distributed on all chromosomes except chromosome 4A, accounting for 5.86%~13.84% of phenotypic variations. A total of 97 QTLs governing the PTN from 15 mapping populations were used to construct QTL consensus map in wheat. Consequently, 33 of meta QTLs and their closely linked molecular markers were available and confirmed. The minimum interval of meta QTL was 1.94 cM. The study would be useful to fine QTL mapping and molecular marker-assisted selection breeding for the productive tiller number in wheat.
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