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Multi-Environment Quantitative Trait Loci Mapping for Grain Iron and Zinc Content Using Bi-parental Recombinant
Tripti Singhal1, C Tara Satyavathi2, S P Singh1
1ICAR-Indian Agricultural Research Institute, New Delhi, India.
Frontiers in Plant Science
|June 7, 2021
Summary
Pearl millet, a climate-resilient crop, shows significant genetic variation for iron and zinc. This study identified quantitative trait loci (QTLs) for these essential minerals, aiding in crop improvement.
Area of Science:
- Agricultural Science
- Genetics
- Plant Breeding
Background:
- Pearl millet is a vital climate-resilient crop, crucial for food security in marginal environments.
- Enhancing micronutrient content (iron and zinc) in pearl millet is essential for human nutrition and crop value.
Purpose of the Study:
- To identify quantitative trait loci (QTLs) associated with grain iron (Fe) and zinc (Zn) content in pearl millet.
- To map these QTLs across diverse environmental conditions and identify candidate genes for marker-assisted selection.
Main Methods:
- A recombinant inbred line (RIL) population of 210 lines was developed from a cross between PPMI 683 and PPMI 627.
- A genome-wide SSR-based genetic linkage map was constructed, and QTL analysis was performed for Fe and Zn content over three years and three locations.
- Bioinformatics approaches were used to identify candidate genes within the identified QTL regions.
Main Results:
- A total of 22 QTLs were identified for grain Fe and Zn content, with 14 for Fe and eight for Zn.
- Phenotypic variance explained by individual QTLs ranged from 2.85% to 25.95%.
- Two constitutive QTLs for both Fe and Zn were co-mapped on linkage groups 2 and 3, with candidate genes including Ferritin and various transporters identified.
Conclusions:
- The identified QTLs and candidate genes provide valuable targets for improving Fe and Zn content in pearl millet.
- These findings can accelerate breeding programs through marker-assisted selection, enhancing nutritional value and economic returns.
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