Abstract Blast disease caused by Magnaporthe grisea is a major biotic constraint to the production of pearl millet in India. The pathogen is highly variable in nature, but isolates are mostly specific in their host range. Pathogenic variation among 80 M. grisea isolates collected from major pearl millet growing states in India was studied on pearl millet host differentials (ICMB 93333-P1, ICMB 95444, ICMB 97222-P1, ICMB 01333, ICMB 02444, ICMR 06444, 863B-P2, ICMR 06222, ICMR 11003 and IP 21187-P1) under greenhouse conditions. Based on reaction of isolates on host differentials (virulent = score ≥ 4 and avirulent = score ≤ 3 on a 1-to-9 scale), 80 isolates were clustered into 14 pathogenic groups. Based on the virulence profiling, isolates Pg 138, Pg 186, Pg 204, and Pg 232 representing different pathogenic groups, and collected from different states have been selected for greenhouse screening of pearl millet lines for blast resistance.

中文翻译：

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印度稻瘟病菌分离株的致病变异导致珍珠粟爆炸

摘要 由稻瘟病菌引起的稻瘟病是印度珍珠粟生产的主要生物制约因素。病原体在性质上是高度可变的，但分离株大多在其宿主范围内具有特异性。对从印度主要珍珠粟种植邦收集的 80 株 M. grisea 分离株的致病变异进行了珍珠粟寄主差异研究（ICMB 93333-P1、ICMB 95444、ICMB 97222-P1、ICMB 01333、ICMB 02444、ICMR 0643BP286 , ICMR 06222, ICMR 11003 和 IP 21187-P1) 在温室条件下。根据分离株对宿主差异的反应（毒力 = 评分 ≥ 4，无毒力 = 评分 ≤ 3，1 到 9 分），将 80 个分离株分为 14 个致病组。基于毒力分析，分离出代表不同致病组的 Pg 138、Pg 186、Pg 204 和 Pg 232，