Efficiency of pathotype mixture in screening for Downy Mildew resistance in Pearl Millet

Sharma, Y K and Rao, V P and Thakur, R P and Rai, K N (2006) Efficiency of pathotype mixture in screening for Downy Mildew resistance in Pearl Millet. International Sorghum and Millets Newsletter, 47. pp. 139-142.

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Sclerospora graminicola (Sacc.) Schröet., the causal agent of downy mildew disease in pearl millet [Pennisetum glaucum (L.) R. Br.], has an inherent mechanism to develop variability because of heterothallism (Michelmore et al. 1982). The pathogen survives through sexually produced oospores, which are genetic recombinants, and the pathogen populations can, therefore, be highly variable and adaptable in different environments. The existence of variability in S. graminicola has been reported and different hostspecific pathotypes have been identified (Thakur and Rao 1997; Thakur 1999; Thakur et al. 2003). Development of improved breeding lines as potential parental lines (A-,B- and R-lines) of hybrids with downy mildew resistance has been the major research focus at ICRISAT-Patancheru, India. These breeding lines are routinely screened against individual pathotypes in succession to identify those with resistance to single or multiple pathotypes (Thakur et al. 2001). Frequently, a question is asked “why cannot pearl millet lines be screened against a mixture of pathotypes instead of individual pathotypes in order to identify resistance against multiple pathotypes, and therefore, make the screening system more time- and resource-effective?” To address this question, we studied the efficiency of a mixture of two diverse pathotypes of S. graminicola in identifying pearl millet lines with resistance to either or both.

Item Type: Article
Subjects: Mandate crops > Millets
Depositing User: Library ICRISAT
Date Deposited: 11 Sep 2011 11:02
Last Modified: 11 Sep 2011 11:02
URI: http://oar.icrisat.org/id/eprint/1139
Official URL:
Funders: Indian Council of Agricultural Research
Acknowledgement: UNSPECIFIED
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