Frontiers in Plant Science (Oct 2022)

Genomic footprints of selection in early-and late-flowering pearl millet landraces

  • Adama Faye,
  • Adama Faye,
  • Adama Faye,
  • Adeline Barnaud,
  • Adeline Barnaud,
  • Ndjido Ardo Kane,
  • Ndjido Ardo Kane,
  • Ndjido Ardo Kane,
  • Philippe Cubry,
  • Cédric Mariac,
  • Concetta Burgarella,
  • Bénédicte Rhoné,
  • Bénédicte Rhoné,
  • Bénédicte Rhoné,
  • Aliou Faye,
  • Aliou Faye,
  • Aliou Faye,
  • Katina Floride Olodo,
  • Katina Floride Olodo,
  • Katina Floride Olodo,
  • Katina Floride Olodo,
  • Aby Cisse,
  • Aby Cisse,
  • Aby Cisse,
  • Aby Cisse,
  • Marie Couderc,
  • Anaïs Dequincey,
  • Leïla Zekraouï,
  • Djibo Moussa,
  • Moussa Tidjani,
  • Yves Vigouroux,
  • Cécile Berthouly-Salazar,
  • Cécile Berthouly-Salazar,
  • Cécile Berthouly-Salazar

DOI
https://doi.org/10.3389/fpls.2022.880631
Journal volume & issue
Vol. 13

Abstract

Read online

Pearl millet is among the top three-cereal production in one of the most climate vulnerable regions, sub-Saharan Africa. Its Sahelian origin makes it adapted to grow in poor sandy soils under low soil water regimes. Pearl millet is thus considered today as one of the most interesting crops to face the global warming. Flowering time, a trait highly correlated with latitude, is one of the key traits that could be modulated to face future global changes. West African pearl millet landraces, can be grouped into early- (EF) and late-flowering (LF) varieties, each flowering group playing a specific role in the functioning and resilience of Sahelian smallholders. The aim of this study was thus to detect genes linked to flowering but also linked to relevant traits within each flowering group. We thus investigated genomic and phenotypic diversity in 109 pearl millet landrace accessions, i.e., 66 early-flowering and 43 late-flowering, grown in the groundnut basin, the first area of rainfed agriculture in Senegal dominated by dry cereals (millet, maize, and sorghum) and legumes (groundnuts, cowpeas). We were able to confirm the role of PhyC gene in pearl millet flowering and identify several other genes that appear to be as much as important, such as FSR12 and HAC1. HAC1 and two other genes appear to be part of QTLs previously identified and deserve further investigation. At the same time, we were able to highlight a several genes and variants that could contribute to the improvement of pearl millet yield, especially since their impact was demonstrated across flowering cycles.

Keywords