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Article

Metabolite Diversity and Metabolic Genome-Wide Marker Association Studies (Mgwas) for Health Benefiting Nutritional Traits in Pearl Millet Grains

1
Institute of Biological Environmental and Rural Sciences (IBERS), Aberystwyth University, Plas Gogerddan, Aberystwyth SY23 3 EB, UK
2
International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Hyderabad 502324, India
*
Author to whom correspondence should be addressed.
Academic Editors: Francesco Mercati, Francesco Carimi and Suleyman I. Allakhverdiev
Cells 2021, 10(11), 3076; https://doi.org/10.3390/cells10113076
Received: 18 October 2021 / Revised: 1 November 2021 / Accepted: 5 November 2021 / Published: 8 November 2021
(This article belongs to the Special Issue Omics in Plant Genetics and Breeding)
As efforts are made to increase food security, millets are gaining increasing importance due to their excellent nutritional credentials. Among the millets, pearl millet is the predominant species possessing several health benefiting nutritional traits in its grain that are helpful in mitigating chronic illnesses such as type−2 diabetes and obesity. In this paper, we conducted metabolomic fingerprinting of 197 pearl millet inbred lines drawn randomly from within the world collection of pearl millet germplasm and report the extent of genetic variation for health benefitting metabolites in these genotypes. Metabolites were extracted from seeds and assessed using flow infusion high-resolution mass spectrometry (FIE-HRMS). Metabolite features (m/z), whose levels significantly differed among the germplasm inbred lines, were identified by ANOVA corrected for FDR and subjected to functional pathway analysis. A number of health-benefiting metabolites linked to dietary starch, antioxidants, vitamins, and lipid metabolism-related compounds were identified. Metabolic genome-wide association analysis (mGWAS) performed using the 396 m/z as phenotypic traits and the 76 K SNP as genotypic variants identified a total of 897 SNPs associated with health benefiting nutritional metabolite at the -log p-value ≤ 4.0. From these associations, 738 probable candidate genes were predicted to have an important role in starch, antioxidants, vitamins, and lipid metabolism. The mGWAS analysis focused on genes involved in starch branching (α-amylase, β-amylase), vitamin-K reductase, UDP-glucuronosyl, and UDP-glucosyl transferase (UGTs), L-ascorbate oxidase, and isoflavone 2′-monooxygenase genes, which are known to be linked to increases in human health benefiting metabolites. We demonstrate how metabolomic, genomic, and statistical approaches can be utilized to pinpoint genetic variations and their functions linked to key nutritional properties in pearl millet, which in turn can be bred into millets and other cereals crops using plant breeding methods. View Full-Text
Keywords: pearl millet; metabolites; starch; antioxidants; vitamins; germplasm; mGWAS; marker-trait associations; candidate genes pearl millet; metabolites; starch; antioxidants; vitamins; germplasm; mGWAS; marker-trait associations; candidate genes
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MDPI and ACS Style

Yadav, C.B.; Srivastava, R.K.; Gangashetty, P.I.; Yadav, R.; Mur, L.A.J.; Yadav, R.S. Metabolite Diversity and Metabolic Genome-Wide Marker Association Studies (Mgwas) for Health Benefiting Nutritional Traits in Pearl Millet Grains. Cells 2021, 10, 3076. https://doi.org/10.3390/cells10113076

AMA Style

Yadav CB, Srivastava RK, Gangashetty PI, Yadav R, Mur LAJ, Yadav RS. Metabolite Diversity and Metabolic Genome-Wide Marker Association Studies (Mgwas) for Health Benefiting Nutritional Traits in Pearl Millet Grains. Cells. 2021; 10(11):3076. https://doi.org/10.3390/cells10113076

Chicago/Turabian Style

Yadav, Chandra B., Rakesh K. Srivastava, Prakash I. Gangashetty, Rama Yadav, Luis A.J. Mur, and Rattan S. Yadav. 2021. "Metabolite Diversity and Metabolic Genome-Wide Marker Association Studies (Mgwas) for Health Benefiting Nutritional Traits in Pearl Millet Grains" Cells 10, no. 11: 3076. https://doi.org/10.3390/cells10113076

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