Genome-Wide SNP Discovery and Mapping QTLs for Seed Iron and Zinc Concentrations in Chickpea (Cicer arietinum L.)

Sab, S and Lokesha, R and Mannur, D M and Somasekhar, S and Jadhav, K and Mallikarjuna, B P and Laxuman, C and Yeri, S and Valluri, V and Bajaj, P and Chitikineni, A and Vemula, A K and Rathore, A and Varshney, R K and Shankergoud, I and Thudi, M (2020) Genome-Wide SNP Discovery and Mapping QTLs for Seed Iron and Zinc Concentrations in Chickpea (Cicer arietinum L.). Frontiers in Nutrition (TSI), 7 (559120). pp. 1-9. ISSN 2296-861X

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Biofortification through plant breeding is a cost-effective and sustainable approach towards addressing micronutrient malnutrition prevailing across the globe. Screening cultivars for micronutrient content and identification of quantitative trait loci (QTLs)/genes and markers help in the development of biofortified varieties in chickpea (Cicer arietinum L.). With the aim of identifying the genomic regions controlling seed Fe and Zn concentrations, the F2 : 3 population derived from a cross between MNK-1 and Annigeri 1 was genotyped using genotyping by sequencing approach and evaluated for Fe and Zn concentration. An intraspecific genetic linkage map comprising 839 single nucleotide polymorphisms (SNPs) spanning a total distance of 1,088.04 cM with an average marker density of 1.30 cM was constructed. By integrating the linkage map data with the phenotypic data of the F2 : 3 population, a total of 11 QTLs were detected for seed Fe concentration on CaLG03, CaLG04, and CaLG05, with phenotypic variation explained ranging from 7.2% (CaqFe3.4) to 13.4% (CaqFe4.2). For seed Zn concentration, eight QTLs were identified on CaLG04, CaLG05, and CaLG08. The QTLs individually explained phenotypic variations ranging between 5.7%(CaqZn8.1) and 13.7%(CaqZn4.3). Three QTLs for seed Fe and Zn concentrations (CaqFe4.4, CaqFe4.5, and CaqZn4.1) were colocated in the “QTL-hotspot” region on CaLG04 that harbors several drought tolerance-related QTLs. We identified genes in the QTL regions that encode iron–sulfur metabolism and zinc-dependent alcohol dehydrogenase activity on CaLG03, iron ion binding oxidoreductase on CaLG04, and zinc-induced facilitator-like protein and ZIP zinc/iron transport family protein on CaLG05. These genomic regions and the associated markers can be used in marker-assisted selection to increase seed Fe and Zn concentrations in agronomically superior chickpea varieties.

Item Type: Article
Divisions: Research Program : Genetic Gains
Statistics, Bio-Informatics & Data Management
CRP: CGIAR Research Program on Grain Legumes and Dryland Cereals (GLDC)
Uncontrolled Keywords: Chickpea, Seed, Iron, Zinc, SNP, QTL
Subjects: Others > Plant Nutrition
Mandate crops > Chickpea
Others > Genetics and Genomics
Others > Food and Nutrition
Others > Seeds/Seed Bank
Depositing User: Mr Arun S
Date Deposited: 29 Dec 2020 12:23
Last Modified: 29 Dec 2020 12:23
Official URL:
Acknowledgement: This work has been carried out as part of the CGIAR Research Program on GLDC. ICRISAT is a member of the CGIAR System Organization.
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