Analysis of digenic epistatic effects and<Emphasis Type="Italic">QE</Emphasis> interaction effects QTL controlling grain weight in rice |
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| Authors: | Gao Yong-ming Zhu Jun Song You-shen He Ci-xin Shi Chun-hai Xing Yong-zhong |
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| Institution: | (1) Agronomy Department, Zhejiang University, 310029 Hangzhou, China;(2) National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, 430070 Wuhan, China |
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| Abstract: | Immortalized F2 population of rice (Oryza sativa L.) was developed by randomly mating F1 among recombinant inbred (RI) lines derived from (Zhenshan 97B × Minghui 63), which allowed replications within and across
environments. OTL (quantitative trait loci) mapping analysis on kilo-grain weight of immortalized F2 population was performed by using newly developed software for QTL mapping, QTLMapper 2.0. Eleven distinctly digenic epistatic
loci included a total of 15 QTL were located on eight chromosome. QTL main effects of additive, domainance, and additive ×
additive, additive × domainance, and dominance × dominance interactions were estimated. Interaction effects between QTL main
effects and environments (QE) were predicted. Less than 40% of single effects, most of which were additive effects, for identified QTL were significant
at 5% level. The directional difference for QTL main effects suggested that these QTL were distributed in parents in the repulsion
phase. This should make it feasible to improve kilo-grain weight of both parents by selecting apprents in the repulsion phase.
This should make it feasible to improve kilo-grain weight of both parents by selecting appropriate new recombinants. Only
few of theQE interaction effects were significant. Application prospect for QTL mapping achievements in genetic breeding was discussed.
Project (No. 39893354) supported by the National Natural Science Foundation of China |
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| Keywords: | Immortalized F2 population Rice Kilo-grain weight QTL Epistasis QTL × environment |
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