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Genomic signatures of adaptation to Sahelian and Soudanian climates in sorghum landraces of Senegal

Faye Jacques, Maina Fanna, Hu Zhenbin, Foncéka Daniel, Cissé Ndiaga, Morris Geoffrey P.. 2019. Genomic signatures of adaptation to Sahelian and Soudanian climates in sorghum landraces of Senegal. Ecology and Evolution, 9 (10) : pp. 6038-6051.

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Quartile : Q2, Sujet : ECOLOGY / Quartile : Q3, Sujet : EVOLUTIONARY BIOLOGY

Abstract : Uncovering the genomic basis of climate adaptation in traditional crop varieties can provide insight into plant evolution and facilitate breeding for climate resilience. In the African cereal sorghum (Sorghum bicolor L. [Moench]), the genomic basis of adaptation to the semiarid Sahelian zone versus the subhumid Soudanian zone is largely unknown. To address this issue, we characterized a large panel of 421 georeferenced sorghum landrace accessions from Senegal and adjacent locations at 213,916 single‐nucleotide polymorphisms (SNPs) using genotyping‐by‐sequencing. Seven subpopulations distributed along the north‐south precipitation gradient were identified. Redundancy analysis found that climate variables explained up to 8% of SNP variation, with climate collinear with space explaining most of this variation (6%). Genome scans of nucleotide diversity suggest positive selection on chromosome 2, 4, 5, 7, and 10 in durra sorghums, with successive adaptation during diffusion along the Sahel. Putative selective sweeps were identified, several of which colocalize with stay‐green drought tolerance (Stg) loci, and a priori candidate genes for photoperiodic flowering and inflorescence morphology. Genome‐wide association studies of photoperiod sensitivity and panicle compactness identified 35 and 13 associations that colocalize with a priori candidate genes, respectively. Climate‐associated SNPs colocalize with Stg3a, Stg1, Stg2, and Ma6 and have allelic distribution consistent with adaptation across Sahelian and Soudanian zones. Taken together, the findings suggest an oligogenic basis of adaptation to Sahelian versus Soudanian climates, underpinned by variation in conserved floral regulatory pathways and other systems that are less understood in cereals.

Mots-clés Agrovoc : Sorghum bicolor, adaptation aux changements climatiques, Tolérance à la sécheresse, Résistance génétique, amélioration génétique, Génome, Allèle

Mots-clés géographiques Agrovoc : Sénégal

Mots-clés libres : Africa, Drought tolerance, Local adaptation, Selective sweep, Stay green

Classification Agris : F30 - Plant genetics and breeding
P40 - Meteorology and climatology
F63 - Plant physiology - Reproduction

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

  • Faye Jacques, Kansas State University (USA)
  • Maina Fanna, Kansas State University (USA)
  • Hu Zhenbin, Kansas State University (USA)
  • Foncéka Daniel, CIRAD-BIOS-UMR AGAP (SEN)
  • Cissé Ndiaga, CERAAS (SEN)
  • Morris Geoffrey P., Kansas State University (USA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/592671/)

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