%A LOU Jue,YANG Wen-Qing,LI Zhong-Xing,LUO Tian-Kuan,XIE Yong-Chu,ZHENG Guo-Chu,YUE Gao-Hong,XU Jian-Long,LU Hua-Jin %T Evaluation of Improvement Effect of Restorer Lines on Pyramiding Genes Resistant to Rice Blast, Bacterial Leaf Blight and Brown Planthopper %0 Journal Article %D 2016 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2016.00031 %P 31-42 %V 42 %N 01 %U {https://zwxb.chinacrops.org/CN/abstract/article_6022.shtml} %8 2016-01-12 %X

The novel blast resistance genes, Pi-GD-1(t) and Pi-GD-2(t) (abbreviated as G1 and G2, respectively) from rice cultivar Sanhuangzhan2, bacterial blight resistance gene Xa23 (abbreviated as X) from CBB23 and brown planthopper resistance gene Bph18(t) (abbreviated as B) from IR65482-7-216-1-2-B (abbreviated as IR65482) were introgressed into three rice restorer lines, Wenhui 845, Wenhui 117 and Wenhui 143, by marker-assisted backcross and pyramiding breeding methods integrated with artificial inoculation, natural induction and phenotypic selections. The eight resistant restorer lines pyramiding blast and brown planthopper resistance genes, i.e. Wenhui 845-G1-G2-B-4, Wenhui 845-G1-G2-B-5, Wenhui 117-G1-G2-X-B-3, Wenhui 143-G1-G2-B-3, Wenhui 143-G2-X-B-9, Wenhui 143-G2-X-B-10, Wenhui 143-G1-G2-B-11, and Wenhui 143-G1-G2-B-37, and their tester lines crossed with the sterile line Wufeng A demonstrated the similar or slight lower level of resistance against rice blast and brown planthopper as compared with the resistant donor parents Sanhuangzhan2 or IR65482. Part of developed restorer lines (Wenhui 117-G1-G2-X-B-3, Wenhui 143-G2-X-B-9 and Wenhui 143-G2-X-B-10) and their tester lines showed resistance or moderate resistance to bacterial blight. The newly developed restorers resistant to blast, bacterial blight and brown planthopper were similar or superior to their respective original types in agronomic traits under normal condition, implying these resistant restorer lines can be useful in hybrid rice breeding and production. The results indicated that Xa23 could completely express its dominant resistance against different restorer genetic backgrounds whereas effects of resistance improvement in Pi-GD-1(t), Pi-GD-2(t), and Bph18(t) depend on their genetic background.