Identification of major QTL for Preharvest Sprouting Resistance in white Wheat

• 1、Key Laboratory of Wheat Biology and Genetic Improvement in South Yellow & Huai River Valley,Ministry of Agriculture/College of Agronomy,Anhui Agricultural University,Hefei 230036,China

Abstract：Pre-harvest sprouting (PHS) is an important quality constraint in common wheat (Triticum aestivum L.), which can lead to yield losses and downgrading of grain quality in the areas where long periods of wet weather occur frequently during harvest time. In order to identify major QTL for pre-harvest sprouting tolerance in Chinese wheat landrace 'Zitongnvermai', we constructed a recombinant inbred line (RIL) population from the crosses of Zhoumai18/Zitongnvermai in this study. By analyzing the correlation and significance of difference of phenotype data collected from three environments, our results indicated that pre-harvest sprouting resistance of each line showed relatively stable trend in different years or different methods within the same year. Eight QTLs were detected using inclusive composite interval mapping and distributed on chromosome 2B, 3A, 5A and 6B. Except for the QTL on 3A, the rest QTLs were rarely reported. QPhs.ahau-2B.2，QPhs.ahau-6B.1and QPhs.ahau-6B.2 were identified as major QTL and their phenotypic variance explained was 92.4%,55.7% and 54.3%, respectively. The results provide important information for the breeding programmes of pre-harvest sprouting tolerance in wheat.

Keywords： Wheat Preharvest sprouting Dormancy QTL