Development and evaluation of multi-genotype varieties of rice derived from MAGIC lines |
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Authors: | Xiao-Fang Li Zhi-Xia Liu Dong-Bo Lu Yan-Zhuo Liu Xing-Xue Mao Zhi-Xin Li Hua-Jun Li |
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Institution: | 1. Rice Research Institute of Guangdong Academy of Agriculture Sciences, Guangzhou, 510640, China 2. Crop Genetics and Breeding Institute of Yangtze River University, Jinzhou, 434025, China 3. Guangzhou Nanguo Agricultural (Group) Co. Ltd., Guangzhou, 510405, China
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Abstract: | Multi-genotype varieties can effectively alleviate or reverse the decline of genetic diversity in agriculture caused by the predominant extension of mono-genotype (pure line) varieties of crop plants. We devised a novel breeding strategy for developing multi-genotype varieties of rice from MAGIC lines, which were derived from two convergent crosses among 8 or 12 parental lines, respectively. We found that both multi-genotype varieties and varietal mixtures were superior to their component lines/varieties in both yielding and blast-resistance performances. When the multi-genotype varieties were developed through intensive selection, they displayed comparable or better performance in yielding level and disease resistance in comparison to current leading mono-genotype varieties of rice. A promising multi-genotype variety has been selected over a 2-year regional trial in Hainan province and it will be hopefully granted a varietal-release permit. Multi-genotype breeding may be an alternative and feasible solution to the sustainable development of agriculture. |
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