Mapping quantitative trait loci for downy mildew resistance in pearl millet

Jones, E S and Liu, C J and Gale, M D and Hash, C T and Witcombe, J R (1995) Mapping quantitative trait loci for downy mildew resistance in pearl millet. Theoretical and Applied Genetics, 91 (3). pp. 448-456. ISSN 0040-5752

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Quantitative trait loci (QTLs) for resistance to pathogen populations of Scelerospora graminicola from India, Nigeria, Niger and Senegal were mapped using a resistant x susceptible pearl millet cross. An RFLP map constructed using F2 plants was used to map QTLs for traits scored on F4 families. QTL analysis was carried out using the interval mapping programme Mapmaker/QTL. Independent inheritance of resistance to pathogen populations from India, Senegal, and populations from Niger and Nigeria was shown. These results demonstrate the existence of differing virulences in the pathogen populations from within Africa and between Africa and India. QTLs of large effect, contributing towards a large porportion of the variation in resistance, were consistently detected in repeated screens. QTLs of smaller and more variable effect were also detected. There was no QTLs that were effective against all four pathogen populations, demonstrating that pathotype-specific resistance is a major mechanism of downy mildew resistance in this cross. For all but one of the QTLs, resistance was inherited from the resistant parent and the inheritance of resistance tended to be the result of dominance or over-dominance. The implications of this research for pearl millet breeding are discussed

Item Type: Article
Uncontrolled Keywords: QTLs; RFLP; Pearlmillet; Downy mildew resistance
Subjects: Mandate crops > Millets
Depositing User: Ms K Syamalamba
Date Deposited: 09 Jan 2013 10:44
Last Modified: 07 Feb 2014 06:17
Official URL:
Acknowledgement: UNSPECIFIED
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