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Improving Blast Resistance of a Thermo-Sensitive Genic Male Sterile Rice Line GD-8S by Molecular Marker-Assisted Selection

作者：

Wuge Liu;Sujuan Jin;Xiaoyuan Zhu;Wang Feng;Jinhua Li;Zhenrong Liu;Yuncheng Liao;Min Zhu;Huijun Huang;Liu Yi-ba

单位：

Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; These authors contributed equally to this paper);Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;Agronomy College, Jiangxi Agricultural University, Nanchang 330045, Chin;Agronomy College, Jiangxi Agricultural University, Nanchang 330045, China; Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China

关键词：

rice;blast resistance;thermo-sensitive genic male sterile line;molecular marker-assisted selection;breedin

摘要：

The broad-spectrum blast resistance gene Pi-1, from donor line BL122, was introduced into a thermo-sensitive genic male sterile rice line GD-8S, which possessed good grain quality but high susceptibility to rice blast, by using backcross breeding and molecular marker-assisted selection. Five elite improved male sterile lines, RGD8S-1, RGD8S-2, RGD8S-3, RGD8S-4 and RGD8S-5, were selected based on the results of molecular marker analysis, spikelet sterility, recovery rate of genetic background and agronomic traits. Thirty-three representative blast isolates collected from Guangdong Province, China were used to inoculate the improved lines and the original line GD-8S artificially. The resistance frequencies of the improved lines ranged from 76.47% to 100%, much higher than that of the original line GD-8S (9.09%). On the agronomic characters, there were no significant differences between the improved lines and GD-8S except for flag leaf length and panicle number per plant. The improved lines could be used for breeding hybrid rice with high blast resistance.

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Improving Blast Resistance of a Thermo-Sensitive Genic Male Sterile Rice Line GD-8S by Molecular Marker-Assisted Selection

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