Mapping Quantitative Trait Loci Controlling High Iron and Zinc Content in Self and Open Pollinated Grains of Pearl Millet [Pennisetum glaucum (L.) R. Br.]

Kumar, S and Hash, C T and Thirunavukkarasu, N and Singh, G and Rajaram, V and Rathore, A and Senapathy, S and Mahendrakar, M D and Yadav, R S and Srivastava, R K (2016) Mapping Quantitative Trait Loci Controlling High Iron and Zinc Content in Self and Open Pollinated Grains of Pearl Millet [Pennisetum glaucum (L.) R. Br.]. Frontiers in Plant Science, 7 (1636). 01-16. ISSN 1664-462X

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Abstract

Pearl millet is a multipurpose grain/fodder crop of the semi-arid tropics, feeding many of the world’s poorest and most undernourished people. Genetic variation among adapted pearl millet inbreds and hybrids suggests it will be possible to improve grain micronutrient concentrations by selective breeding. Using 305 loci, a linkage map was constructed to map QTLs for grain iron [Fe] and zinc [Zn] using replicated samples of 106 pearl millet RILs (F6) derived from ICMB 841-P3 × 863B-P2. The grains of the RIL population were evaluated for Fe and Zn content using atomic absorption spectrophotometer. Grain mineral concentrations ranged from 28.4 to 124.0 ppm for Fe and 28.7 to 119.8 ppm for Zn. Similarly, grain Fe and Zn in open pollinated seeds ranged between 22.4–77.4 and 21.9–73.7 ppm, respectively. Mapping with 305 (96 SSRs; 208 DArT) markers detected seven linkage groups covering 1749 cM (Haldane) with an average intermarker distance of 5.73 cM. On the basis of two environment phenotypic data, two co-localized QTLs for Fe and Zn content on linkage group (LG) 3 were identified by composite interval mapping (CIM). Fe QTL explained 19% phenotypic variation, whereas the Zn QTL explained 36% phenotypic variation. Likewise for open pollinated seeds, the QTL analysis led to the identification of two QTLs for grain Fe content on LG3 and 5, and two QTLs for grain Zn content on LG3 and 7. The total phenotypic variance for Fe and Zn QTLs in open pollinated seeds was 16 and 42%, respectively. Analysis of QTL × QTL and QTL × QTL × environment interactions indicated no major epistasis.

Item Type: Article
Divisions: Research Program : Genetic Gains
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Mapping, Quantitative Trait Loci , RIL, QTL, Iron and zinc, Biofortification, Pearl millet
Subjects: Mandate crops > Millets > Pearl Millet
Depositing User: Mr Ramesh K
Date Deposited: 30 Nov 2016 06:24
Last Modified: 30 Nov 2016 06:24
URI: http://oar.icrisat.org/id/eprint/9802
Official URL: http://dx.doi.org/10.3389/fpls.2016.01636
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: SK gratefully acknowledges the Jawaharlal Nehru Memorial Fund (JNMF), New Delhi, India, for providing Doctoral Fellowship; and the University Grants Commission (UGC), New Delhi, India for providing Junior Research Fellowship. This work has been published as part of the CGIAR Research Program on Dryland Cereals.
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