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Genome-wide association mapping of resistance against rice blast strains in South China and identification of a new Pik allele.
Rice ( IF 5.5 ) Pub Date : 2019-07-17 , DOI: 10.1186/s12284-019-0309-7 Chenggang Li 1 , Dan Wang 2 , Shasha Peng 2 , Yue Chen 1 , Pin Su 1 , Jianbin Chen 1 , Limin Zheng 1 , Xinqiu Tan 1 , Jinling Liu 2 , Yinghui Xiao 2 , Houxiang Kang 3 , Deyong Zhang 1 , Guo-Liang Wang 2, 4 , Yong Liu 1
Rice ( IF 5.5 ) Pub Date : 2019-07-17 , DOI: 10.1186/s12284-019-0309-7 Chenggang Li 1 , Dan Wang 2 , Shasha Peng 2 , Yue Chen 1 , Pin Su 1 , Jianbin Chen 1 , Limin Zheng 1 , Xinqiu Tan 1 , Jinling Liu 2 , Yinghui Xiao 2 , Houxiang Kang 3 , Deyong Zhang 1 , Guo-Liang Wang 2, 4 , Yong Liu 1
Affiliation
BACKGROUND
Effective management of rice blast, caused by the fungus Magnaporthe oryzae, requires an understanding of the genetic architecture of the resistance to the disease in rice. Rice resistance varies with M. oryzae strains, and many quantitative trait loci (QTLs) affecting rice blast resistance have been mapped using different strains of M. oryzae from different areas. However, little is known about the genetic architecture of rice resistance against the M. oryzae population in Hunan Province, which is a main rice production area in South China.
RESULTS
In this study, we used three isolates from Hunan Province and the rice diversity panel 1 to perform a genome-wide association study (GWAS) of blast resistance in rice. A total of 56 QTLs were identified. One of the QTLs is localized with the resistance gene Pik locus which confers resistance to all three isolates. Genomic sequence analysis of the resistant cultivars led to the identification of a new Pik allele, which we named Pikx. Yeast two-hybrid and co-immunoprecipitation assays between AvrPiks and Pikx confirmed that Pikx is a new allele at the Pik locus.
CONCLUSIONS
Our GWAS has identified many new blast resistance QTLs. The identified new Pik allele Pikx will be useful for breeding cultivars with high resistance to blast in Hunan and other South China provinces. Further research on the relationship between AvrPiks and Pikx will provide new insights into the molecular mechanism of rice resistance to M. oryzae.
更新日期：2019-11-01
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