Quantitative trait loci for seed dormancy in rice |
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Authors: | Wei Li Lei Xu Xufeng Bai Yongzhong Xing |
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Institution: | (1) National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research, Huazhong Agricultural University, Wuhan, 430070, China; |
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Abstract: | Seed dormancy (SD) is controlled by its own complicated genetic factors and environmental factors. SD is an important trait
affecting grain yield and quality in cereal crops. A population comprising 240 recombinant inbred lines (RIL) was used for
detecting quantitative trait locus (QTL) for SD in rice. To minimize the effect of environment, data for lines for which the
optimum temperature during the late ripening stage is either below 20°C or above 30°C were excluded from the analysis, which
left 185 lines. In a dynamic germination test of the parents of the population, Minghui 63 showed clear SD and Zhenshan 97
showed none. The seeds of each RIL, harvested 32 days after heading, were divided into two lots: seeds in one lot were sown
immediately, without any treatment to break their dormancy, whereas seeds in the other lot were sown after they had been exposed
to dry heat (50°C) for 72 h. Composite interval mapping showed the presence of qDGE1, qDGR5a, qDGR5b, and qDGR7 in the first lot whereas only qDGR7 was detected in the second lot––which had been treated to break SD––indicating the strong influence of qDGR7 in controlling SD. A recently cloned Sdr4 is also located in the qDGR7 region. Coincidently, three rice homologues of Arabidopsis SD gene DOG1 were found in qDGE1 and qDGR5b regions where no SD QTL had been reported so far. These results indicate that the QTL found in this study are reliable, and
that it would be worthwhile to clone qDGE1 and qDGR5b. |
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