PJB-2023-534
Genetic variation and distribution of different blast resistance genes in landrace rice of Thailand
Parisatcha Sangsuwan
Abstract
Magnaporthe oryzae (also known as Pyricularia oryzae) is a plant pathogenic fungus causing blast disease in rice. While rice can resist M. oryzae via R or Pi genes, one R gene is not enough to provide long-term resistance as M. oryzae has a short lifespan, allowing it to quickly adapt to new environments and resistant rice. This study aimed to screen R gene resources from landraces for a rice breeding program using specific gene primers. Of eight R genes among 17 rice varieties, the Pi54 gene had the highest frequency of 29.17%, while the Pik gene was found in only one landrace rice with a frequency of 2.08%. Phylogenetic trees showed the Pi9, Pi54 and Pib genes were the most diverse, with their nucleotide alignment revealing indels and point mutations. Among the rice varieties, Tubtim ChoomPhoo contained five resistance genes and is therefore an appropriate germplasm resource for polygenic traits to resist M. oryzae. The studied results should be ideal for using parental lines to improve new rice varieties that are blast-resistant
To Cite this article:
Sangsuwan, P. 2025. Genetic variation and distribution of different blast resistance genes in landrace rice of Thailand. Pak. J. Bot., 57(1): DOI: http://dx.doi.org/10.30848/PJB2025-1(31)
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