Mapping QTL for traits related to water use efficiency, yield and yield related parameters in recombinant inbred line population of Groundnut (Arachis hypogaea L.)
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Date
2017-08-11
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Drought is the greatest impact on yield losses in groundnut. With the objective of
identifying Quantitative trait loci (QTL) controlling traits related to water use efficiency
viz., SPAD chlorophyll meter reading, specific leaf area and carbon isotope discrimination
in recombinant inbred line (RIL) population of the cross GKVK 4 × NRCG 12473. Linkage
map analysis of the 164 loci resulted in the mapping of 105 marker loci on 22 linkage
groups (LGs) and total map distance of 763.1 cM was developed. QTL analysis detected a
total of four main effect QTL (M-QTL) for SCMR and two QTL for SLA with 8.64 -
11.35% phenotypic variation explained (PVE) and a total of 44 M-QTLs were obtained for
pod yield and yield related parameters with PVE % up to 43.74 %. A total of 56 significant
epistatic-QTL (E-QTL) interactions were detected with PVE % upto 29.70 %. M-QTL and
E-QTL interaction explained a fairly large magnitude of PVE % for traits related to WUE,
pod yield and its parameters. Identified linked markers/QTLs have to be validated for its
potential use in marker assisted breeding for high WUE. Drought tolerance was quantified
by thirteen drought tolerant indices, among them STI, MP, GMP and HMP showed
significant high correlation with pod yield under well watered and water stress conditions.
This aids for identification of four RILs 1076-3-2, 1647-4-8, 1034-7-3 and 1100-6-8 with
high WUE and high pod yield.
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