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Genetic analysis and breeding use of blast resistance in a japonica rice mutant R917

文献类型: 外文期刊

作者: Zhang, MX 1 ; Xu, JL 2 ; Luo, RT 2 ; Shi, D 2 ; Li, ZK 2 ;

作者机构: 1.Zhejiang Acad Agr Sci, Hangzhou 310021, Zhejiang Provin, Peoples R China

2.Zhejiang Acad Agr Sci, Hangzhou 310021, Zhejiang Provin, Peoples R China; IRRI, Plant Breeding Genet & Biochem Div, Makati 1271, Philippines

关键词: blast;induced mutation;inheritance;resistance spectrum;rice;rice breeding for disease resistance

期刊名称:EUPHYTICA ( 影响因子:1.895; 五年影响因子:2.181 )

ISSN: 0014-2336

年卷期: 2003 年 130 卷 1 期

页码:

收录情况: SCI

摘要: R917, a japonica rice mutant with broad-spectrum of resistance to blast, was selected after treatment of the F-1 seeds from the cross between Chengte 232 and Xiushui 37 with 10 krad of Co-60 gamma-ray. R917 was evaluated for blast resistance in multiple years and locations. It was resistant to 136 of 138 strains of Magnaporthe grisea collected from different regions in China with a resistance frequency of 98.55%, much higher than 86.13% and 10.15% of Chengte 232 and Xiushui 37. To analyze its inheritance of resistance to blast, R917 was crossed with the susceptible cultivar, Nonghu 6, and its two parents. It had a single dominant resistance gene to Chinese races ZB13, ZC15 and ZE3, nonallelic to those of Chengte 232 and Xiushui 37. When inoculated with 7 Japanese differential strains, R917 showed the same reaction pattern as Toride 1 and differed from the other differential varieties. But R917 was different from Toride 1 in its reaction to 7 Chinese strains. Allelism test indicated that the resistance genes between R917 and Toride 1 were nonallelic to Chinese races ZC15 and ZE3. R917 was a semidwarf with strong stem, narrow and erect leaf, tight plant type and monogenic broad-spectrum resistance to blast. Several lines with desirable agronomic traits newly bred using R917 as a donor of blast resistance had the same broad-spectrum of resistance to blast as R917, indicating there was no linkage drag between the resistance gene and other important agronomic genes in R917. R917 has been used as a donor in rice breeding programs in China.

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