PJB-2018-1059
DETECTION OF QUANTITATIVE TRAIT LOCUS (QTL) FOR STIGMA EXSERTION RATE IN RICE (ORYZA SATIVE L.)
Yanrong Wang
Abstract
Stigma exsertion is an important agronomic trait, which influences out-crossing rate and finally influences the yield of hybrid seed production, particularly for japonica hybrid rice (Oryza sativa L.). Therefore, it is important to understand the information of quantitative trait loci (QTL) for stigma exsertion in rice. The present study was to map QTL for stigma exsertion traits using simple sequence repeat (SSR) markers and F2 population derived from the cross of Liao60B/Liaojing9. Twelve QTLs for stigma exsertion traits were detected on chromosome 1, 2, 5 8 and 9, with both additive effects and dominant effects. The qPGCD-9 located at the interval of RM257-RM215 was more important with LOD scores of 12.96, accounting for 32.04% of the phenotypic variation, so as to the qPGCD-8 and qPGCES-8 at the same interval of RM502-RM447 with LOD scores of 5.64 and 6.81, accounting for 12.30% and 14.26% of the phenotypic variation, respectively. Among these, multi-effect QTLs were observed at the intervals of RM502-RM447 and RM3810-RM1067 on chromosomes 8 and 1, respectively. The results are potentially valuable in breeding rice varieties with high exserted stigma rate.
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