Mapping QTLs underpin nutrition components in aromatic rice germplasm
M Z Islam1, M Arifuzzaman2, S Banik3
1Genetic Resources and Seed Division, Bangladesh Rice Research Institute (BRRI), Gazipur, Bangladesh.
Plos One
|June 12, 2020
Summary
Researchers identified nutrient-rich rice germplasm and mapped quantitative trait loci (QTL) for iron, zinc, amylose, and protein. This study aids in developing biofortified rice varieties for improved nutrition.
Area of Science:
- Agricultural Science
- Genetics and Molecular Biology
- Nutritional Science
Background:
- Rice is a global staple, necessitating research into enhancing its nutritional value.
- Identifying and utilizing nutrient-enriched rice germplasm is key for breeding improved varieties.
Purpose of the Study:
- To identify quantitative trait loci (QTL) associated with iron, zinc, amylose, and protein content in aromatic rice germplasm.
- To analyze nutritional components and genetic relationships within rice germplasm for breeding applications.
Main Methods:
- Analysis of 113 aromatic rice germplasm for Fe, Zn, amylose, and protein content.
- Cluster analysis using Mahalanobis D2 distances and composite interval mapping (CIM) with 45 polymorphic SSRs.
- Identification of significant QTLs for nutritional traits across different chromosomes.
Main Results:
- Germplasm Radhuni pagal, Kalobakri, Thakurbhog, and Hatisail showed highest mean values for Fe, Zn, amylose, and protein, respectively.
- Four major clusters were identified, with significant inter-cluster distance between clusters III and IV.
- Eight significant QTLs were detected, including a highly significant QTL for protein on chromosome 1 and for amylose on chromosome 8.
Conclusions:
- Germplasm from clusters III and IV possess potential for high heterotic response in breeding programs.
- Identified QTLs are crucial for developing biofortified rice varieties with enhanced nutritional content.
- This research provides a foundation for future rice biofortification breeding initiatives.
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