Scholarlink

<p>Sorghum [<i>Sorghum bicolor</i> (L.) Moench] is a fundamental cereal for food security in the semi-arid tropics of West Africa, yet the genetic architecture of its performance traits in Nigerian savannas remains insufficiently characterized. This study utilized a genome-wide association study (GWAS) approach to identify genomic regions associated with key agronomic traits. A diversity panel of 288 sorghum accessions was evaluated for days to 50% heading (DHD), days to 50% flowering (DFLW), plant height (PHT), and grain yield (GYD) across two contrasting agro-ecological zones: Bagauda (Sudan Savanna) and Samaru (Northern Guinea Savanna) in Nigeria. Results revealed substantial variation among genotypes for phenological and yield traits. Broad-sense heritability (H<sup>2</sup>) was high for phenological traits reaching 0.99 for DHD, DFLW, and PHT, and 0.51 for GYD. The GWAS, utilizing 3,967 high-quality SNP markers, identified several significant marker-trait associations (MTAs). Notably, a major quantitative trait locus (QTL) for early maturity was consistently identified on Chromosome 3 (Chr03). Furthermore, distinct yield-specific loci were identified on Chr10 and Chr03, with a candidate gene on Chr10 having a role in carbohydrate metabolism and grain filling. This study identified genomic targets on Chr03 and Chr10 for accelerating marker-assisted selection to develop climate-resilient, early maturing, and high-yielding sorghum varieties for West African breeding programs. However, these candidate loci require rigorous experimental validation prior to deployment in breeding programs.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Identification of Genomic Loci for Early Maturity and Yield Components in West African Sorghum Germplasm via Genome-Wide Association Mapping

  • 期刊论文

  • 发表日期：

    2026年5月15日

查看全文
  • Abdulwahab Saliu Shaibu,
  • Saddiqa Yahaya Abdullahi,
  • Ahmad Idris Bello

摘要

Sorghum [Sorghum bicolor (L.) Moench] is a fundamental cereal for food security in the semi-arid tropics of West Africa, yet the genetic architecture of its performance traits in Nigerian savannas remains insufficiently characterized. This study utilized a genome-wide association study (GWAS) approach to identify genomic regions associated with key agronomic traits. A diversity panel of 288 sorghum accessions was evaluated for days to 50% heading (DHD), days to 50% flowering (DFLW), plant height (PHT), and grain yield (GYD) across two contrasting agro-ecological zones: Bagauda (Sudan Savanna) and Samaru (Northern Guinea Savanna) in Nigeria. Results revealed substantial variation among genotypes for phenological and yield traits. Broad-sense heritability (H2) was high for phenological traits reaching 0.99 for DHD, DFLW, and PHT, and 0.51 for GYD. The GWAS, utilizing 3,967 high-quality SNP markers, identified several significant marker-trait associations (MTAs). Notably, a major quantitative trait locus (QTL) for early maturity was consistently identified on Chromosome 3 (Chr03). Furthermore, distinct yield-specific loci were identified on Chr10 and Chr03, with a candidate gene on Chr10 having a role in carbohydrate metabolism and grain filling. This study identified genomic targets on Chr03 and Chr10 for accelerating marker-assisted selection to develop climate-resilient, early maturing, and high-yielding sorghum varieties for West African breeding programs. However, these candidate loci require rigorous experimental validation prior to deployment in breeding programs.