Identification of stable heat tolerance QTLs using inter-specific recombinant inbred line population derived from GPF 2 and ILWC 292

PLoS One. 2021 Aug 9;16(8):e0254957. doi: 10.1371/journal.pone.0254957. eCollection 2021.

Abstract

Heat stress during reproductive stages has been leading to significant yield losses in chickpea (Cicer arietinum L.). With an aim of identifying the genomic regions or QTLs responsible for heat tolerance, 187 F8 recombinant inbred lines (RILs) derived from the cross GPF 2 (heat tolerant) × ILWC 292 (heat sensitive) were evaluated under late-sown irrigated (January-May) and timely-sown irrigated environments (November-April) at Ludhiana and Faridkot in Punjab, India for 13 heat tolerance related traits. The pooled ANOVA for both locations for the traits namely days to germination (DG), days to flowering initiation (DFI), days to 50% flowering (DFF), days to 100% flowering (DHF), plant height (PH), pods per plant (NPP), biomass (BIO), grain yield (YLD), 100-seed weight (HSW), harvest index (HI), membrane permeability index (MPI), relative leaf water content (RLWC) and pollen viability (PV)) showed a highly significant difference in RILs. The phenotyping data coupled with the genetic map comprising of 1365 ddRAD-Seq based SNP markers were used for identifying the QTLs for heat tolerance. Composite interval mapping provided a total of 28 and 23 QTLs, respectively at Ludhiana and Faridkot locations. Of these, 13 consensus QTLs for DG, DFI, DFF, DHF, PH, YLD, and MPI have been identified at both locations. Four QTL clusters containing QTLs for multiple traits were identified on the same genomic region at both locations. Stable QTLs for days to flowering can be one of the major factors for providing heat tolerance as early flowering has an advantage of more seed setting due to a comparatively longer reproductive period. Identified QTLs can be used in genomics-assisted breeding to develop heat stress-tolerant high yielding chickpea cultivars.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cicer / genetics*
  • Heat-Shock Response / genetics
  • Inbreeding*
  • India
  • Odds Ratio
  • Phenotype
  • Plant Breeding*
  • Quantitative Trait Loci / genetics*
  • Recombination, Genetic / genetics*
  • Reproduction / genetics
  • Temperature
  • Thermotolerance / genetics*

Grants and funding

The INSPIRE research grant provided to AK by Department of Science and Technology (DST), New Delhi, India and research grant provided under the projects ‘Incentivizing Research in Agriculture’ and ‘Consortia Research Platform on Molecular Breeding, by Indian Council of Agricultural Research, New Delhi to SS for carrying out the research are highly acknowledged. RKV thanks Bill and Melinda Gates Foundation, USA and CGIAR Research Program on Grain Legumes and Dryland Cereals for supporting part of this study at ICRISAT.