Enhancing drought tolerance in chickpea using genomics approaches uri icon

abstract

  • Terminal drought is one of the major constraints in chickpea(Cicer arietinum L.) leading to more than 50% production losses.To overcome these production losses due to drought, arange of translational genomics approaches are being used inchickpea breeding to develop improved chickpea varieties forenhancing food and nutritional security in developing countriesin the context of climate change. For understanding the complexnature of drought tolerance, precise phenotypic data (20drought component traits evaluated in one to seven seasonsat one to five locations in India on two intra-specific mappingpopulations - ICC 4958 × ICC 1882 and ICC 283 × ICC 8261)together with extensive genotyping data was analyzed. As aresult, nine QTL clusters containing QTLs for several droughttolerance traits have been identified, which can be targeted formolecular breeding. Among these clusters, one cluster harbouring48% robust M-QTLs for 12 traits and explaining about58.20% phenotypic variation present on CaLG04 has beenreferred as ?QTL-hotspot?. This genomic region contains sevenSSR markers (ICCM0249, NCPGR127, TAA170, NCPGR21, TR11,GA24 and STMS11). This QTL region has been introgressedin several leading varieties (e.g. JG 11, Chefe, KAK2) by usingmarker-assisted backcrossing (MABC) approach. Multi-locationevaluation of these MABC lines provided several lines thathave up to 24% higher yield than the recurrent parents. Introgressionof this region into other elite cultivars will enhanceproduction and productivity in chickpea

publication date

  • 2017