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Evidence for enhanced resistance to diverse isolates of Pearl Millet Downy Mildew through gene pyramiding

OAR@ICRISAT

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Relation http://oar.icrisat.org/1137/
 
Title Evidence for enhanced resistance to diverse isolates of Pearl Millet Downy Mildew through gene pyramiding
 
Creator Hash, C T
Thakur, R P
Rao, V P
Raj, A G B
 
Subject Millets
 
Description Breeding for downy mildew resistance in pearl millet
[Pennisetum glaucum (L.) R. Br.] at ICRISAT-Patancheru
in India, is currently focused on developing hybrid
parental lines with resistance to one or more pathogenic
variants of Sclerospora graminicola (Sacc.) Schroet. that
exist in India. Resistance incorporation in inbred lines is
done through conventional pedigree and bulk-pedigree
selection, pure-line selection within elite inbreds originally developed by bulk-pedigree methods, backcrossing with conventional selection, and backcrossing with markerassisted selection (Hash et al. 1999). Stability of
resistance to downy mildew in pearl millet inbred lines
and hybrid cultivars has become elusive in India due to
host-directed evolution of pathogenic variation in S.
graminicola populations (Thakur et al. 1992). Average
commercial life spans of popular hybrids have been
reduced to only 3–5 years before they must be withdrawn
due to pathogen virulence changes (Thakur et al. 2003).
There are currently several pathogenic variants of S.
graminicola prevalent in different parts of pearl millet
growing regions of India, and new variants with higher
virulence levels keep on appearing with deployment of
new cultivars (Thakur et al. 2004; Pushpavathi et al. 2006).
A number of quantitative trait loci (QTLs) for host plant
resistance effective against one or more pathogen isolates
of S. graminicola have been identified (Jones et al. 1995,
Jones et al. 2002; Hash and Witcombe 2001), and resistance
alleles for some of these QTLs have been transferred by
marker-assisted backcrossing to elite parental lines of
popular hybrids.
 
Date 2006
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/1137/1/ISMN-47_134-138_2006.pdf
Hash, C T and Thakur, R P and Rao, V P and Raj, A G B (2006) Evidence for enhanced resistance to diverse isolates of Pearl Millet Downy Mildew through gene pyramiding. International Sorghum and Millets Newsletter, 47. pp. 134-138.