Identification of heterotic loci associated with yield-related traits in Chinese common wild rice (Oryza rufipogon Griff.) |
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Authors: | Xiaojin Luo Shuang Wu Feng Tian Xiaoyun XinXiaojun Zha Xianxin DongYongcai Fu Xiangkun Wang Jinshui Yang Chuanqing Sun |
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Institution: | a Department of Plant Genetics and Breeding, China Agricultural University, Beijing 100094, China b Key Laboratory of Crop Heterosis and Utilization of Ministry of Education, Beijing 100094, China c Beijing Key Laboratory of Crop Genetic Improvement, Beijing 100094, China d Key Laboratory of Crop Genetic Improvement and Genome of Ministry of Agriculture, Beijing 100094, China e State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, China f Group of Crop Genetic and Breeding, Jiangxi Agricultural University, Nanchang 330045, China |
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Abstract: | Many rice breeding programs have currently reached yield plateaus as a result of limited genetic variability in parental strains. Dongxiang common wild rice (Oryza rufipogon Griff.) is the progenitor of cultivated rice (Oryza sativa L.) and serves as an important gene pool for the genetic improvement of rice cultivars. In this study, heterotic loci (HLs) associated with six yield-related traits were identified in wild and cultivated rice and investigated using a set of 265 introgression lines (ILs) of O. rufipogon Griff. in the background of the Indica high-yielding cultivar Guichao 2 (O. sativa L.). Forty-two HLs were detected by a single point analysis of mid-parent heterosis values from test cross F1 offspring, and 30 (71.5%) of these HLs showed significantly positive effects, consistent with the superiority shown by the F1 test cross population in the six yield-related traits under study. Genetic mapping of hsp11, a locus responsible for the number of spikelets per panicle, confirmed the utility of these HLs. The results indicate that favorable HLs capable of improving agronomic traits are available. The identification of HLs between wild rice and cultivated rice could lead to a new strategy for the application of heterosis in rice breeding. |
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Keywords: | Common wild rice Introgression lines Heterotic loci Fine mapping |
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