Yadav, R.S. and Hash, C.T. and Bidinger, F.R. and Cavan, G.P. and Howarth, C.J. (2002) Quantitative trait loci associated with traits determining grain and stover yield in pearl millet under terminal drought-stress conditions. Theoretical and Applied Genetics, 104 (1). pp. 67-83.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png) |
PDF
Restricted to ICRISAT researchers only |
Abstract
Drought stress during the reproductive stage is one of the most important environmental factors reducing the grain yield and yield stability of pearl millet. A QTL mapping approach has been used in this study to understand the genetic and physiological basis of drought tolerance in pearl millet and to provide a more-targeted approach to improving the drought tolerance and yield of this crop in water-limited environments. The aim was to identify specific genomic regions associated with the enhanced tolerance of pearl millet to drought stress during the flowering and grain-filling stages. Testcrosses of a set of mapping-population progenies, derived from a cross of two inbred pollinators that differed in their response to drought, were evaluated in a range of managed terminal drought-stress environments. A number of genomic regions were associated with drought tolerance in terms of both grain yield and its components. For example, a QTL associated with grain yield per se and for the drought tolerance of grain yield mapped on linkage group 2 and explained up to 23% of the phenotypic variation. Some of these QTLs were common across stress environments whereas others were specific to only a particular stress environment. All the QTLs that contributed to increased drought tolerance did so either through better than average maintenance (compared to non-stress environments) of harvest index, or harvest index and biomass productivity. It is concluded that there is considerable potential for marker-assisted backcross transfer of selected QTLs to the elite parent of the mapping population and for their general use in the improvement of pearl millet productivity in water-limited environments
| Item Type: | Article |
|---|---|
| Author Affiliation: | 1.Institute of Grassland and Environmental Research (IGER), Plas Gogerddan, Aberystwyth, Ceredigion SY233 EB, Wales,United Kingdom e-mail: rattan.yadav@bbsrc.ac.uk Fax: +44-1970-823242, Present address: G.P. Cavan, 11 Albany Rd, Old Windsor, Berkshire SL4 2QD, United Kingdom GB |
| Subjects: | Crop Improvement |
| Divisions: | Millet |
| Depositing User: | Syamala |
| Date Deposited: | 27 Jul 2011 05:56 |
| Last Modified: | 27 Jul 2011 05:56 |
| Official URL: | http://dx.doi.org/10.1007/s001220200008 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/2492 |
Actions (login required)
 |
View Item |
