Improving Rice Blast Resistance by Mining Broad-Spectrum Resistance Genes at Pik Locus
Received date: 2021-06-03
Accepted date: 2021-08-16
Online published: 2022-02-09
Magnaporthe oryzae is known for its genetic diversity and pathogenic variability, leading to rapid breakdown of resistance in rice. Incorporating multiple broad-spectrum blast resistance genes into rice cultivars would extend disease resistance longevity. Effective resistance breeding in rice therefore requires continual enrichment of the reservoir of resistance genes and alleles. We conducted a large-scale screen of rice blast resistance in about 2 000 rice accessions. Among them, 247 accessions showed at least medium resistance to the natural infection of rice blast and 7 novel Pik alleles were identified from them. Variations in gene sequences were then correlated with the phenotypic trait to enable the identification of favorable alleles. Among the seven novel Pik alleles, the resistant rate of Pik-R0/ME/7017 donors was greater than 80%, and the disease score was less than 3. Through molecular marker-assisted backcross breeding, we successfully transferred the three Pik alleles, Pik-R0/ME/7017, into an elite cultivated line Kongyu 131 to obtain BC3F2 lines, which showed enhanced resistance to rice blast compared with the recurrent parent. Assessment of these near-isogenic lines in the greenhouse using 31 isolates of M. oryzae from Heilongjiang Province of China revealed that the resistant levels of the BC3F2 lines with Pik-R0/ME/7017 were significantly higher than those of the established cloned resistance genes Pik-m and Pi1. Exploring such alleles will enrich our gene library for resistance to rice blast.
Key words： genetic diversity; near-isogenic line; Pik gene; resistance gene allele; rice blast; R gene
Zhou Ying, Wan Tao, Yuan Bin, Lei Fang, Chen Meijuan, Wang Qiong, Huang Ping, Kou Shuyan, Qiu Wenxiu, Liu Li . Improving Rice Blast Resistance by Mining Broad-Spectrum Resistance Genes at Pik Locus[J]. Rice Science, 2022 , 29(2) : 133 -142 . DOI: 10.1016/j.rsci.2022.01.002
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