Genotype-by-environment interactions for starch, mineral, and agronomic traits in pearl millet hybrids evaluated across five locations in West Africa

Prakash Gangashetty, Chandra Bhan Yadav, M Riyazuddin, Anil Kumar, Peter Asungre, Ignatitius Angarawai, Luis Mur, Rattan Yadav

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Abstract

Introduction: Pearl millet is a staple cereal grown in the harshest environments of arid and semi-arid regions of Asia and sub-Saharan Africa. It is the primary source of calories for millions of people in these regions because it has better adaptation to harsh environmental conditions and better nutritional traits than many other cereals. By screening the pearl millet inbred germplasm association panel (PMiGAP), we earlier reported the best genotypes with the highest concentration of slowly digestible and resistant starch in their grains.

Methods: In the current study, we tested these 20 top-performing pearl millet hybrids, identified based on starch data, in a randomised block design with three replications at five locations in West Africa, viz. Sadore and Konni (Niger), Bambey (Senegal), Kano (Nigeria), and Bawku (Ghana). Phenotypic variability was assessed for agronomic traits and mineral traits (Fe and Zn).

Results and discussion: Analysis of variance demonstrated significant genotypic, environmental, and GEI effects among five testing environments for agronomic traits (days to 50% flowering, panicle length, and grain yield), starch traits (rapidly digestible starch, slowly digestible starch, resistant starch, and total starch), and mineral trait (iron and zinc). Starch traits, such as rapidly digestible starch (RDS) and slowly digestible starch (SDS), showed nonsignificant genotypic and environmental interactions but high heritability, indicating the lower environmental influence on these traits in the genotype × testing environments. Genotype stability and mean performance across all the traits were estimated by calculating the multi-trait stability index (MTSI), which showed that genotypes G3 (ICMX207070), G8 (ICMX207160), and G13 (ICMX207184) were the best performing and most stable among the five test environments.
Original languageEnglish
Article number1171773
Number of pages11
JournalFrontiers in Plant Science
Volume14
DOIs
Publication statusPublished - 23 May 2023

Keywords

  • pearl millet, total starch, resistan5t starch, slowly digestible starch, PMiGAP. Type-2 diabetes, grain yield
  • resistant starch,
  • iron
  • Zinc
  • GxE
  • rapidly digestible starch
  • total starch
  • pearl millet
  • resistant starch
  • slowly digestible starch
  • genotype x environment interaction
  • zinc

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