Distribution and Resistance Analysis of Blast Resistance Genes in Rice Varieties from the Huang-Huai-Hai Region
Received date: 2025-10-22
Online published: 2026-05-11
In this study, functional molecular markers of eight blast resistance genes—Pigm, Pi2, Pid3-A4, Ptr, Pita, Pi63, Pi9, and bsr-d1—were used to detect resistance genes in 90 japonica rice cultivars popularized in the Huang-Huai-Hai rice region. Resistance identification was also conducted via artificial inoculation with a mixture of Magnaporthe oryzaeraces under field conditions. The results showed that only four resistance genes—Pita, Pi2, Pigm, and Pid3-A4—were detected in the tested cultivars. Materials carrying the Pigm gene alone generally exhibited broad-spectrum resistance, while the combination of Pita and Pi2 genes conferred broad-spectrum and durable resistance, although single-gene-mediated resistance was unstable. Cultivars from Shandong and Jiangsu provinces showed better overall blast resistance, with Jiangsu cultivars displaying higher polymorphism of the detected resistance genes and more diverse gene combinations. This study clarifies the distribution of blast resistance genes in main japonica rice cultivars from the Huang-Huai-Hai region and its correlation with disease resistance, providing a theoretical basis and germplasm resources for pyramiding superior genes in resistance breeding.
Key words： rice; Huang-Huai-Hai rice region; blast resistance gene; molecular marker
ZHANG Qiaoling, GAO Farui, GAO Guoliang, LOU Like, HUANG Jingfen, HUANG Xincheng, QIAO Weihua . Distribution and Resistance Analysis of Blast Resistance Genes in Rice Varieties from the Huang-Huai-Hai Region[J]. China Rice, 2026 , 32(3) : 71 -75 . DOI: 10.3969/j.issn.1006-8082.2026.03.012
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