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Chinese Agricultural Science Bulletin ›› 2026, Vol. 42 ›› Issue (8): 38-43.doi: 10.11924/j.issn.1000-6850.casb2025-0514

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Preliminary Molecular Characterization and Allelic Profiling of Blast Resistance Genes in 93 Core Parental Lines of Oryza sativa L

YU Linchuang(), CHEN Qingming, LU Yun, SHEN Guanwang, QI Yuliang, FU Ding(), YU Xinchun, CHANG Xingyuan, SHEN Guanghui   

  1. Xinyang Academy of Agricultural Sciences, Xinyang, Henan 464000
  • Received:2025-06-23 Revised:2025-10-11 Online:2026-04-25 Published:2026-04-23

Abstract:

In order to clarify the distribution of core resistance sources and excellent gene combinations, aiming at the problems of unclear background of rice blast resistance genes and lack of accurate basis for resistance breeding of rice backbone parents,this study selected 93 stable and adaptive indica rice lines to analyze the distribution characteristics of blast resistance genes in core indica rice parents from the southern rice-growing region of Henan Province using molecular marker techniques. Specific molecular markers for five resistance genes, pi2, pita, pi5, pia, and pigm were employed. Total genomic DNA was extracted using the SDS micro-extraction method, and samples were systematically identified through agarose gel electrophoresis. Results showed that among the 93 samples, pia exhibited the highest frequency at 66.67%, followed by pita at 59.14%. The frequencies of pi2 and pigm were the lowest and equal at 33.33%. Regarding the number of resistance genes, the highest proportion (36 samples, 38.71%) carried two resistance genes, followed by 25 samples (26.88%) harboring three resistance genes. Only two samples lacked any resistance genes. Among resistance gene combinations, the pia+pita combination was most prevalent (22 samples, 23.66%), followed by pia+pita+pi5 (11 samples). The least frequent combinations (2 samples) were distributed across the range of 0-4 resistance genes. In conclusion, pia, pita and pi5 were the dominant resistant sources in the southern Henan rice area, and the double gene polymerization was the main type. The selected multi-gene polymerization materials could be directly used for disease resistance breeding. This study provides accurate resistance source information and theoretical support for local rice broad-spectrum and long-lasting rice blast resistance breeding. Subsequently, phenotypic verification and gene pyramiding breeding can be carried out in combination with pathogen race monitoring.

Key words: rice, blast resistance, molecular markers, core parental lines, gene combinations

CLC Number: