Mapping QTLs Controlling Flowering Time and Important Agronomic Traits in Pearl Millet

Kumar, S and Hash, C T and Nepolean, T and Satyavathi, C T and Singh, G and Mahendrakar, M D and Yadav, R S and Srivastava, R K (2017) Mapping QTLs Controlling Flowering Time and Important Agronomic Traits in Pearl Millet. Frontiers in Plant Science, 8 (1731). pp. 1-13. ISSN 1664-462X

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Abstract

Pearl millet [Pennisetum glaucum (L.) R. Br.] is a staple crop for the people of arid and semi-arid regions of the world. It is fast gaining importance as a climate resilient nutricereal. Exploiting the bold seeded, semi-dwarf, and early flowering genotypes in pearl millet is a key breeding strategy to enhance yield, adaptability, and for adequate food in resource-poor zones. Genetic variation for agronomic traits of pearl millet inbreds can be used to dissect complex traits through quantitative trait locus (QTL) mapping. This study was undertaken to map a set of agronomically important traits like flowering time (FT), plant height (PH), panicle length (PL), and grain weight (self and open-pollinated seeds) in the recombinant inbred line (RIL) population of ICMB 841-P3 × 863B-P2 cross. Excluding grain weight (open pollinated), heritabilities for FT, PH, PL, grain weight (selfed) were in high to medium range. A total of six QTLs for FT were detected on five chromosomes, 13 QTLs for PH on six chromosomes, 11 QTLs for PL on five chromosomes, and 14 QTLs for 1,000-grain weight (TGW) spanning five chromosomes. One major QTL on LG3 was common for FT and PH. Three major QTLs for PL, one each on LG1, LG2, and LG6B were detected. The large effect QTL for TGW (self) on LG6B had a phenotypic variance (R2) of 62.1%. The R2 for FT, TGW (self), and PL ranged from 22.3 to 59.4%. A total of 21 digenic interactions were discovered for FT (R2 = 18–40%) and PL (R2 = 13–19%). The epistatic effects did not reveal any significant QTL × QTL × environment (QQE) interactions. The mapped QTLs for flowering time and other agronomic traits in present experiment can be used for marker-assisted selection (MAS) and genomic selection (GS) breeding programs.

Item Type: Article
Divisions: Research Program : Genetic Gains
Research Program : West & Central Africa
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: RILs, QTL, flowering time, grain weight, plant height, pearl millet, Mapping QTLs
Subjects: Others > Plant Breeding
Mandate crops > Millets > Pearl Millet
Others > Plant Growth
Depositing User: Mr Ramesh K
Date Deposited: 21 Dec 2017 06:57
Last Modified: 22 Dec 2017 07:31
URI: http://oar.icrisat.org/id/eprint/10368
Official URL: http://dx.doi.org/10.3389/fpls.2017.01731
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: The first author gratefully acknowledges the Jawaharlal Nehru Memorial Fund (JNMF), New Delhi—India and University Grants Commission (UGC), New Delhi—India for providing Doctoral Fellowship and Junior Research Fellowship (JRF), respectively. This work has been published as part of the CGIAR Research Program on Dryland Cereals.
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