title: Detection of QTLs for Yield Heterosis in Rice Using a RIL Population and Its Testcross Population.
abstract: Analysis of the genetic basis of yield heterosis in rice was conducted by quantitative trait locus mapping using a set of 204 recombinant inbred lines (RILs), its testcross population, and mid-parent heterosis dataset (HMP). A total of 39 QTLs for six yield traits were detected, of which three were detected in all the datasets, ten were common to the RIL and testcross populations, six were common to the testcross and HMP, and 17, 2, and 1 were detected for RILs, testcrosses, and HMP, respectively. When a QTL was detected in both the RIL and testcross populations, the difference between TQ and IR24 and that between Zh9A/TQ and Zh9A/IR24 were always in the same direction, providing the potential to increase the yield of hybrids by increasing the yield of parental lines. Genetic action mode of the 39 QTLs was inferred by comparing their performances in RILs, testcrosses, and HMP. The genetic modes were additive for 17 QTLs, dominance for 12 QTLs, and overdominance for 10 QTLs. These results suggest that dominance and overdominance are the most important contributor to yield heterosis in rice, in which the accumulative effects of yield components play an important role.
authors.affiliation: State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China.
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China.
authors.forename: De-Run
authors.initials: DR
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China.
authors.forename: Ye-Yang
authors.initials: YY
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China.
authors.forename: Zhen-Hua
authors.initials: ZH
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China.
authors.forename: Jie-Zheng
authors.initials: JZ
authors.lastname: Ying
authors.affiliation: State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China.
authors.forename: Jie-Yun
authors.identifier: 0000-0002-1439-5061
authors.initials: JY
authors.lastname: Zhuang