Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (12): 2449-2457.DOI: 10.3969/j.issn.1004-1524.20240672

• Crop Science • Previous Articles     Next Articles

Analysis of rice blast resistance in rice varieties from regional trials in Zhejiang Province of China from 2014 to 2023

HAO Zhongna1(), QIU Haiping1, CHAI Rongyao1, HAN Zhanyu2, ZHANG Zhen1, WANG Yanli1, WANG Jiaoyu1, LIU Xin2,*()   

  1. 1. Zhejiang National Test Station for Resistance Identification of Crop Variety, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
    2. Seed Management Station of Zhejiang Province, Hangzhou 310020, China
  • Received:2024-07-23 Online:2025-12-25 Published:2026-01-09

Abstract:

From 2014 to 2023, a total of 1 498 new rice varieties from the regional trials in Zhejiang Province were evaluated for resistance to rice blast (including rice leaf and panicle blast), to analyze the resistance levels of new rice varieties in Zhejiang and compare the differences among different types of rice varieties. Rice leaf blast resistance was assessed by artificial inoculation, while panicle blast resistance was evaluated through natural infection in field.The results showed that, except for the disease grade of panicle blast incidence, the average values of disease grade of leaf blast, disease grade of panicle blast loss rate, composite index of rice blast, and the highest disease grade of panicle blast loss rate all indicated a moderate resistance level. The varieties tested in 2018 and 2020 exhibited the best overall blast resistance, while those from 2023 showed the poorest rice leaf blast resistance, and the varieties from 2016 performed the worst in both panicle blast resistance and comprehensive resistance. Among the tested varieties, the moderately resistant type accounted for the largest proportion, followed by the moderately susceptible type. Based on the composite index of rice blast, the compliance rate of the varieties was 94.9%, and the disease resistance rate (including highly resistant, resistant, and moderately resistant varieties) was 57.1%. Based on the highest disease grade of panicle blast loss rate, the compliance rate was 92.9%, and the disease resistance rate was 67.4%. According to the composite index of rice blast, the resistance levels of different types of rice varieties decreased as follows: single-season hybrid indica-japonica rice>early indica rice>single-season hybrid indica rice>continuous cropping hybrid late indica rice>single-season late japonica rice>continuous cropping late japonica rice.

Key words: rice variety, rice blast, resistance, Zhejiang Province, regional trial

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