Molecular Mapping of QTLs for Heat Tolerance in Chickpea

Paul, P J and Samineni, S and Thudi, M and Sajja, S and Rathore, A and Das, R R and Khan, A W and Chaturvedi, S K and Lavanya, G R and Varshney, R K and Gaur, P M (2018) Molecular Mapping of QTLs for Heat Tolerance in Chickpea. International Journal of Molecular Sciences (TSI), 19(8) (2166). pp. 1-20. ISSN 1661-6596

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Abstract

Chickpea (Cicer arietinum L.), a cool-season legume, is increasingly affected by heat-stress at reproductive stage due to changes in global climatic conditions and cropping systems. Identifying quantitative trait loci (QTLs) for heat tolerance may facilitate breeding for heat tolerant varieties. The present study was aimed at identifying QTLs associated with heat tolerance in chickpea using 292 F8-9 recombinant inbred lines (RILs) developed from the cross ICC 4567 (heat sensitive) × ICC 15614 (heat tolerant). Phenotyping of RILs was undertaken for two heat-stress (late sown) and one non-stress (normal sown) environments. A genetic map spanning 529.11 cM and comprising 271 genotyping by sequencing (GBS) based single nucleotide polymorphism (SNP) markers was constructed. Composite interval mapping (CIM) analysis revealed two consistent genomic regions harbouring four QTLs each on CaLG05 and CaLG06. Four major QTLs for number of filled pods per plot (FPod), total number of seeds per plot (TS), grain yield per plot (GY) and % pod setting (%PodSet), located in the CaLG05 genomic region, were found to have cumulative phenotypic variation of above 50%. Nineteen pairs of epistatic QTLs showed significant epistatic effect, and non-significant QTL × environment interaction effect, except for harvest index (HI) and biomass (BM). A total of 25 putative candidate genes for heat-stress were identified in the two major genomic regions. This is the first report on QTLs for heat-stress response in chickpea. The markers linked to the above mentioned four major QTLs can facilitate marker-assisted breeding for heat tolerance in chickpea.

Item Type: Article
Divisions: Research Program : Asia
Research Program : Genetic Gains
CRP: CGIAR Research Program on Grain Legumes and Dryland Cereals (GLDC)
Uncontrolled Keywords: Climate change, abiotic stress; Cicer arietinum; candidate genes; genetics; heat-stress; molecular breeding; Chickpea
Subjects: Others > Abiotic Stress
Others > Crop Improvement
Others > Drought Tolerance
Others > Plant Breeding
Mandate crops > Chickpea
Others > Genetics and Genomics
Others > Legume Crops
Depositing User: Mr Ramesh K
Date Deposited: 25 Jul 2018 08:49
Last Modified: 25 Jul 2018 09:45
URI: http://oar.icrisat.org/id/eprint/10810
Official URL: https://doi.org/10.3390/ijms19082166
Projects: UNSPECIFIED
Funders: National Food Security Mission (NFSM), Govt. of India; and Tropical Legumes II (TL II) project of Bill and Melinda Gates Foundation (BMGF) for financial support and Department of Science and Technology (DST), Govt. of India
Acknowledgement: National Food Security Mission (NFSM), Govt. of India; and Tropical Legumes II (TL II) project of Bill and Melinda Gates Foundation (BMGF) for financial support and Department of Science and Technology (DST), Govt. of India, for a fellowship to P.J.P.
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