Research on Green Prevention and Control of Rice Blast Based on Analysis of Magnaporthe oryzae Populations in
Chenming Liu1, Yongjin Li2, Xingzhong Li3
1Liuyang Agriculture and Rural Bureau, Changsha 410300, China.
Abstract:
Diverse climatic environments lead to distinct ecological conditions in different rice planting regions, resulting in a wide variety of Magnaporthe oryzae (rice blast fungus) populations that frequently adapt and vary to suit their specific ecological niches. Understanding the diversity of M. oryzae populations across different ecological planting zones is fundamental for controlling rice blast disease. This study systematically investigated the population structure, distribution of avirulence (Avr) genes, and pathogenicity of M. oryzae using 174 monosporic isolates collected in 2021 from three counties in Hunan Province: Xinhua, Longhui, and Liuyang. The results indicated that while the number of physiological races in the three locations was similar, the dominant physiological races differed significantly. Overall, the resistance gene Pikm exhibited the highest resistance frequency. Additionally, genes like Pik, Pikp, and Pizt showed good resistance against pathogen populations in some ecological zones. Resistance frequencies varied dramatically across different ecological environments, indicating differing practical value for specific resistance genes in different ecological regions. Representative isolates from each location were screened and used to test the resistance of locally cultivated main varieties. The results revealed significant differences in the proportion of varieties resistant to the pathogen populations from the three locations. These findings provide a data basis for resistance breeding and the rational distribution of rice varieties across different ecological regions in Hunan Province.
Related Concept Videos
Ecological Disturbance
Ecological Succession
Ecological Niches
What are Populations and Communities?
Analysis of Population Pharmacokinetic Data
Conservation of Small Populations


