Mapping quantitative trait loci for downy mildew resistance in pearl millet

E. S. Jones, C. J. Liu, M. D. Gale, C. T. Hash, J. R. Witcombe

Research output: Contribution to journalArticlepeer-review

Abstract

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 F 2 plants was used to map QTLs for traits scored on F 4 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.

Original languageEnglish
Pages (from-to)448-456
Number of pages9
JournalTheoretical and Applied Genetics
Volume91
Issue number3
DOIs
Publication statusPublished - 01 Aug 1995
Externally publishedYes

Keywords

  • QTLs
  • RFLP
  • pearl millet
  • downy mildew resistance
  • Downy mildew resistance
  • Pearl millet

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