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

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Title Durum wheat heat tolerance loci defined via a north–south gradient
 
Creator Sall, Amadou T.
 
Contributor Kabbaj, Hafssa
ould Ely Menoum, Sidi
Cisse, Madiama
Geleta, Mulatu
Ortiz, Rodomiro
Bassi, Filippo
 
Subject durum wheat
triticum durum desf
 
Description The 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.
 
Date 2024-02-09T14:02:36Z
2024-02-09T14:02:36Z
 
Type Journal Article
 
Identifier https://mel.cgiar.org/reporting/download/hash/e120e604296c3a6026fa3ac95dcc62a2
Amadou T. Sall, Hafssa Kabbaj, Sidi ould Ely Menoum, Madiama Cisse, Mulatu Geleta, Rodomiro Ortiz, Filippo Bassi. (7/12/2023). Durum wheat heat tolerance loci defined via a north–south gradient. The Plant Genome.
https://hdl.handle.net/20.500.11766/69160
Open access
 
Language en
 
Rights CC-BY-4.0
 
Format PDF
 
Publisher Crop Science Society of America
 
Source The Plant Genome;(2023)