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Identification of blast resistance genes in 358 rice germplasms (Oryza sativa L.) using functional molecular markers

文献类型： 外文期刊

作者： Yang, Yongyi 1 ; Zhang, Hua 2 ; Xuan, Ning 2 ; Chen, Gao 2 ; Liu, Xu 2 ; Yao, Fangyi 2 ; Ding, Hanfeng 1 ;

作者机构： 1.Shandong Acad Agr Sci, Shandong Ctr Crop Germplasm Resources, Jinan, Shandong, Peoples R China

2.Shandong Acad Agr Sci, Biotechnol Res Ctr, Jinan, Shandong, Peoples R China

关键词： Rice germplasm;Magnaporthe oryzae;Neck blast;Blast resistance;Functional marker

期刊名称：EUROPEAN JOURNAL OF PLANT PATHOLOGY （ 影响因子：1.907； 五年影响因子：2.022 ）

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收录情况： SCI

摘要： Rice blast, caused by the fungus Magnaporthe oryzae, is one of the most devastating diseases of rice (Oryza sativa L.), and neck blast is the most destructive phase of this disease. Although neck blast causes tremendous yield loss, little is known about the molecular mechanisms underlying the neck blast resistance. To address this issue, we collected 358 rice varieties from different ecotypes in China and assessed them for the neck blast resistance under natural conditions favoring disease development in Jining, Shandong Province. Our results showed that 124 (34.6%) and 234 (65.4%) varieties were resistant and susceptible to M. oryzae under natural field conditions, respectively. Among the 358 rice varieties that were screened for the presence of 13 major blast resistance (R) genes against M. oryzae by using functional markers, 259 varieties contained one to seven R genes. In addition, the relationship between the presence of R genes and the disease reactions was also investigated by integrative analysis of phenotyping and genotyping based on functional markers. Our results showed that the rice blast resistance gene Pi2 was significantly correlated with neck blast resistance. Furthermore, any of the 13 major blast R genes was absent from 32 rice varieties exhibited obvious neck blast resistance, which would be the potential materials for identifying novel neck blast R genes. Taken together, our findings provide insight into the distribution of the 13 major blast R genes in the tested Chinese rice germplasm resources, which will serve as a basis for developing rice blast resistant. Furthermore, 32 rice varieties exhibited neck blast resistance, but they did not harbor any of the 13 major blast R genes. In the future, these varieties may be used to identify novel neck blast R genes.

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