Research Papers

Improvement of Rice Bacterial Blight Resistance of Hybrid Rice Jinyou 207 by Molecular Markerassisted Selection

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  • National Key Laboratory of Crop Improvement/National Center of Plant Gene Research, Huazhong Agricultural University, Wuhan 430070, China;

Received date: 2012-11-26

  Revised date: 2012-12-10

  Online published: 2013-07-10

Abstract

Two bacterial blight resistant varieties, Huahui 20 carrying Xa7 and Xa21 and CBB23 carrying Xa23 as donor parents were crossed with the male parent of hybrid rice Jinyou 207 as receptor parent. Nine bred lines carrying Xa7, Xa21, Xa23,  Xa7 + Xa21, Xa7 + Xa23, respectively, under the genetic background of Xianhui 207 were selected by backcrossing, multicrossing and molecular markerassisted selection and pyramiding. Seven strains of Xanthomonas oryzae pv. oryzae, PXO61, PXO99, ZHE173, GD1358, FuJ, YN24 and HeN11 were inoculated to the nine bred lines and their hybrid combinations with Jin 23A as female parent for identifying the bacterial blight resistances. The results showed that bred lines and hybrid combinations carrying Xa7 gene were resistant to five Xoo strains, PXO61, ZHE173, GD1358, YN24 and FuJ. The bred line and their hybrid combination carrying Xa21 gene were resistant to six Xoo strains, PXO61, PXO99, ZHE173, GD1358, YN24 and FuJ. The bred lines and their hybrid combinations carrying Xa23, Xa7 + Xa21,  Xa7 + Xa23 genes were resistant to all of the seven Xoo strains. The results  showed that yield trials, main agronomic traits and rice quality of the two combinations, Jin 23A/CY100122 (carrying Xa7, resistance to five Xoo strains) and Jin 23A/CY100047 (carrying Xa7 and Xa21, resistant to seven Xoo strains) were similar to Jinyou 207. It can be concluded that these two combinations could replace Jinyou 207 for rice production of secondcropping in the Yangtze River Valley, which can increase the resistance level to bacterial blight.

Cite this article

YAN Chengye, LIU Yan, MOU Tongmin* . Improvement of Rice Bacterial Blight Resistance of Hybrid Rice Jinyou 207 by Molecular Markerassisted Selection[J]. Chinese Journal OF Rice Science, 2013 , 27(4) : 365 -372 . DOI: 10.3969/j.issn.1001-7216.2013.04.005

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