Scholarlink

<p>Maize streak virus (MSV) and micronutrient deficiencies remain major constraints to maize productivity and nutritional security in sub-Saharan Africa. This study evaluated 50&#xa0;extra-early provitamin A‑quality protein maize (PVA-QPM) inbred lines and three checks under natural MSV pressure at Oke-Oyi, Nigeria, across the 2023–2025 cropping seasons using a&#xa0;randomised complete block design with three replications. Highly significant (<i>p</i> &lt; 0.001) genotypic differences were observed for MSV severity, MSV incidence, provitamin&#xa0;A concentration, kernel iron (Fe), kernel zinc (Zn), and grain yield. MSV severity ranged from 2.4&#xa0;to&#xa0;7.5, provitamin&#xa0;A from 6.8&#xa0;to 13.0 µg&#xa0;g<sup>−1</sup>, and grain yield from 4.7&#xa0;to 6.1 t&#xa0;ha<sup>−1</sup>. Broad-sense heritability was high for provitamin&#xa0;A (H<sup>2</sup> = 0.82), MSV severity (H<sup>2</sup> = 0.78), MSV incidence (H<sup>2</sup> = 0.74), and grain yield (H<sup>2</sup> = 0.76), indicating strong genetic control. Genome-wide association analysis identified 25&#xa0;significant SNPs distributed across chromosomes 1–10. These loci co-localised with candidate genes, including NBS-LRR and receptor-like proteins for MSV severity, PSY and LCYB for carotenoid biosynthesis, and FER and ZIP transporters for Fe and Zn accumulation. Pleiotropic loci affecting severity and nutritional traits were detected. Correlation analysis showed a&#xa0;negative relationship between MSV severity and grain yield, while provitamin&#xa0;A, Fe, and Zn were positively associated with yield. The findings demonstrate the feasibility of integrating MSV severity, biofortification, and productivity in extra-early maize. The identified SNPs and genes provide genomic resources for marker-assisted breeding of nutrient-dense, disease-resilient cultivars for sub-Saharan Africa.</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

Targeted Genome-Wide Association of Streak Virus Severity and Nutrition in Biofortified Maize

  • 期刊论文

  • 发表日期：

    2026年7月21日

查看全文
  • Bashir Omolaran Bello,
  • Musa Shuaibu,
  • Alafe Hakeem Azeez,
  • Suleiman Aliyu,
  • Adeola Comfort Odutayo,
  • Aminat Adeola Ahmed,
  • Zainab Adeola Abidoye,
  • Oluwatoyin Abosede Fehintola

摘要

Maize streak virus (MSV) and micronutrient deficiencies remain major constraints to maize productivity and nutritional security in sub-Saharan Africa. This study evaluated 50 extra-early provitamin A‑quality protein maize (PVA-QPM) inbred lines and three checks under natural MSV pressure at Oke-Oyi, Nigeria, across the 2023–2025 cropping seasons using a randomised complete block design with three replications. Highly significant (p < 0.001) genotypic differences were observed for MSV severity, MSV incidence, provitamin A concentration, kernel iron (Fe), kernel zinc (Zn), and grain yield. MSV severity ranged from 2.4 to 7.5, provitamin A from 6.8 to 13.0 µg g−1, and grain yield from 4.7 to 6.1 t ha−1. Broad-sense heritability was high for provitamin A (H2 = 0.82), MSV severity (H2 = 0.78), MSV incidence (H2 = 0.74), and grain yield (H2 = 0.76), indicating strong genetic control. Genome-wide association analysis identified 25 significant SNPs distributed across chromosomes 1–10. These loci co-localised with candidate genes, including NBS-LRR and receptor-like proteins for MSV severity, PSY and LCYB for carotenoid biosynthesis, and FER and ZIP transporters for Fe and Zn accumulation. Pleiotropic loci affecting severity and nutritional traits were detected. Correlation analysis showed a negative relationship between MSV severity and grain yield, while provitamin A, Fe, and Zn were positively associated with yield. The findings demonstrate the feasibility of integrating MSV severity, biofortification, and productivity in extra-early maize. The identified SNPs and genes provide genomic resources for marker-assisted breeding of nutrient-dense, disease-resilient cultivars for sub-Saharan Africa.