Durum wheat heat tolerance loci defined via a north–south gradient

Author:

Sall Amadou Tidiane1ORCID,Kabbaj Hafssa2,Menoum Sidi ould Ely3,Cisse Madiama1,Geleta Mulatu4,Ortiz Rodomiro4ORCID,Bassi Filippo M.2ORCID

Affiliation:

1. Centre de Recherches Agricoles Institut Sénégalais de Recherches Agricoles (ISRA) Saint‐Louis Senegal

2. International Center for the Agricultural Research in the Dry Areas (ICARDA) Rabat Morocco

3. Centre National de Recherche Agronomique et de Développement Agricole (CNRADA) Kaédi Mauritania

4. Department of Plant Breeding Swedish University of Agricultural Sciences (SLU) Lomma Sweden

Abstract

AbstractThe global production of durum wheat (Triticum durum Desf.) is hindered by a constant rise in the frequency of severe heat stress events. To identify heat‐tolerant germplasm, three different germplasm panels (“discovery,” “investigation,” and “validation”) were studied under a range of heat‐stressed conditions. Grain yield (GY) and its components were recorded at each site and a heat stress susceptibility index was calculated, confirming that each 1°C temperature rise corresponds to a GY reduction in durum wheat of 4.6%–6.3%. A total of 2552 polymorphic single nucleotide polymorphisms (SNPs) defined the diversity of the first panel, while 5642 SNPs were polymorphic in the “investigation panel.” The use of genome‐wide association studies revealed that 36 quantitative trait loci were associated with the target traits in the discovery panel, of which five were confirmed in a “subset” tested imposing heat stress by plastic tunnels, and in the investigation panel. A study of allelic combinations confirmed that Q.icd.Heat.003‐1A, Q.icd.Heat.007‐1B, and Q.icd.Heat.016‐3B are additive in nature and the positive alleles at all three loci resulted in a 16% higher GY under heat stress. The underlying SNPs were converted into kompetitive allele specific PCR markers and tested on the validation panel, confirming that each explained up to 9% of the phenotypic variation for GY under heat stress. These markers can now be used for breeding to improve resilience to climate change and increase productivity in heat‐stressed areas.

Funder

Vetenskapsrådet

Publisher

Wiley

Subject

Plant Science,Agronomy and Crop Science,Genetics

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