QTLs controlling yield and stover quality traits in pearl millet uri icon

abstract

  • Preliminary assessment of genetic variability of stover quality traits and stover yield in pearl millet has demonstrated the presence of considerable variation for cell wall digestibility and stover yield (Blümmel et al. 2003). The objectives of this study are mapping QTLs for stover nutritional quality, assessing relationships among stover yield components and quality traits, and selecting target QTLs for MABC. This is the first detailed report of QTLs mapped for pearl millet stover ruminant nutritional quality traits
  • Stover of pearl millet (Pennisetum glaucum (L.) R. Br.)is a major source of dry-season maintenance rations forlivestock in traditional smallholder crop-livestock productionsystems on the semi-arid margins of the Thar desert in South Asia and in the Sahelian region of West and Central Africa (Renard 1997)
  • Stover of pearl millet (Pennisetum glaucum (L.) R. Br.)is a major source of dry-season maintenance rations forlivestock in traditional smallholder crop-livestock productionsystems on the semi-arid margins of the Thardesert in South Asia and in the Sahelian region of Westand Central Africa (Renard 1997).Crop residues, especially those produced in marginalenvironments, have poor nutritional value. Althoughnutritional supplements can enhance the feed quality ofcrop residues, they may not provide a long-term solutionbecause of difficulties in adapting them to local conditions,limited availability, and expense. Genetic enhancementof crop-residue nutritional quality is an alternative approachthat can naturally, cost-efficiently, and permanentlyimprove productivity of these crop-livestock systems.Expression of stover quality traits in pearl millet iscomplex (Hash et al. 2003), and selection based onconventional breeding methods is potentially difficultconsidering that conventional wet-lab analysis of nutritionalvalue is tedious and time-consuming. Identification ofgenomic regions associated with stover quality traitswould permit application of marker-assisted backcrossing(MABC) to improve the feed value of crop residues ofelite hybrids and their parental lines.Preliminary assessment of genetic variability of stoverquality traits and stover yield in pearl millet has demonstratedthe presence of considerable variation for cell walldigestibility and stover yield (Blümmel et al. 2003). Thepearl millet mapping population based on the crossICMB 841 × 863B used in this study is one of severaldeveloped for drought tolerance. It exhibits only limitedvariation for flowering time and plant height while varyingsubstantially for many other plant traits and maintaining areasonable degree of agronomic eliteness. Parents of thispopulation exhibit inherent variation for many stoverquality traits, so this population provides ample scope forquantitative trait locus (QTL) mapping and markerassistedselection (MAS) (Hash et al. 2003). The presentstudy had the following objectives: mapping QTLs forstover nutritional quality, assessing relationships amongstover yield components and quality traits, and selecting target QTLs for MABC. This is the first detailed report of QTLs mapped for pearl millet stover ruminant nutritional quality traits

publication date

  • 2006
  • 2006
  • 2006