OAR@ICRISATPathogenic variation in the pearl millet blast pathogen, Magnaporthe grisea and identification of resistance to diverse pathotypesRSharmaauthorH DUpadhyayaauthorS VManjunathaauthorK NRaiauthorS KGuptaauthorR PThakurauthorBlast, also known as leaf spot, caused by Pyricularia grisea [teleomorph: Magnaporthe grisea], has emerged as a serious disease affecting both forage and grain production in pearl millet in India. Pathogenic variation was studied in a greenhouse using 25 M. grisea isolates collected from four major pearl millet growing states in India (Rajasthan, Haryana, Maharashtra and Uttar Pradesh) on ten pearl millet genotypes (ICMB 02444, ICMB 02777, ICMB 06444, ICMB 93333, ICMB 96666, ICMB 97222, ICMB 99444, 863B, ICMR 06222 and ICMB 95444). Differential reactions to the test isolates were recorded on ICMB 02444, ICMB 93333, ICMB 97222, 863B and ICMR 06222. The 25 isolates were grouped into five different pathotypes based on their reaction types (virulent = ≥ 4 score and avirulent ≤ 3 score on 1-9 scale). For the identification of resistance sources, a pearl millet mini-core comprising 238 accessions was evaluated under greenhouse conditions against five M. grisea isolates (Pg118, Pg119, Pg56, Pg53 and Pg45) representing the five pathotypes. Of 238 accessions, 32 were found to be resistant to at least one pathotype. Resistance to multiple pathotypes (2 or more) was recorded in several accessions, while three accessions (IP 7846, IP 11036 and IP 21187) exhibited resistance to four of the five pathotypes. Four early flowering (≤ 50 days) blast resistant mini-core accessions (IP 7846, IP 4291, IP 15256 and IP 22449) and four accessions (IP 5964, IP 11010, IP 13636 and IP 20577) having high scores (≥ 7) for grain and green fodder yield potential, and overall plant aspect were found to be promising for utilization in pearl millet improvement programs. Identification of five pathotypes of M. grisea and sources of resistance to these pathotypes will provide a foundation for breeding for blast resistance in pearl millet in India. MilletsGenetics and GenomicsPlant Pathology2013American Phytopathological SocietyArticle

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