Detection and Analysis of Dynamic Quantitative Trait Loci at Three Years for Seed Storability in Rice (Oryza sativa)
Received date: 2018-09-03
Accepted date: 2019-02-11
Online published: 2019-02-21
Seed storability is one of the most important special agronomic traits of grain crops, which has great significance for seed production and germplasm conservation. In this study, we obtained a set of recombinant inbred lines (RILs), containing 180 lines and 223 molecular markers for a genetic map, derived from the cross between Longdao5 (LD5) and Zhongyouzao8 (ZYZ8). The set was used to identify quantitative trait loci (QTL) for seed storability traits under natural aging (higher temperature and humidity) at 1, 2 and 3 years after rice harvest. Then the germination rates of seeds at different storage stages were compared and identified by dynamic QTLs. The germination rate of the parents (the germination rate of LD5 was significantly lower than ZYZ8 under different storage stages) and RILs population was significant different under different storage stages, with a significant correlation of germination rate under different storage stages. A total of 17 QTLs were detected to control seed storability; 5, 4 and 3 QTLs were detected for 3 natural aging stages; and 5 dynamic conditional QTLs were detected; these QTLs explained 5.60% to 32.76% of the phenotypic variation, with an additive effect of -16.78% to 16.95%. Among these QTLs, 4 major clusters qSSC2, qSSC6, qSSC7 and qSSC8 were stably and reliably detected under 3 environments; the remaining QTLs were expressed in a single environment. qSSC6 reduced the germination rate. We detected 26 pairs of epistatic interaction sites. The major QTLs qSS1 and qSS4 were also involved in the epistasis effect, so epistatic interaction was an important genetic component for seed storability. These results will provide information for genetic analysis and related QTL fine mapping and will also enrich the gene resources for molecular marker-assisted selection of seed storability.
Key words： rice; natural aging; seed storability; QTL analysis; epistasis interaction
Jin Liu,Xiaoyun Yao,Liqin Yu,Hui Li,Huiying Zhou,Jiayu Wang,Maomao Li . Detection and Analysis of Dynamic Quantitative Trait Loci at Three Years for Seed Storability in Rice (Oryza sativa)[J]. Chinese Bulletin of Botany, 2019 , 54(4) : 464 -473 . DOI: 10.11983/CBB18188
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