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

OAR@ICRISAT

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Relation http://oar.icrisat.org/1139/
 
Title Efficiency of pathotype mixture in screening for Downy Mildew resistance in Pearl Millet
 
Creator Sharma, Y K
Rao, V P
Thakur, R P
Rai, K N
 
Subject Millets
 
Description 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.
 
Date 2006
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/1139/1/ISMN-47_139-142_2006.pdf
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.