Mapping of quantitative trait loci (QTLs) associated with biological nitrogen fixation in an interspecific cross of chickpea
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
The current study was aimed at investigating the genetic variation responsible for nitrogen
fixation efficiency, growth and yield attributing traits in Cicer. The phenotypic variation was
studied at two different agroclimatic zones viz., Central plain zone (Ludhiana) and Sub
mountain undulating zone (Gurdaspur) for 2 consecutive rabi seasons (2018-20). Both the
experimental sites varied significantly for the climatic conditions and soil physicochemical
and nutrient profiles over the years. Wild parent C. reticulatum ILWC292 showed
significantly high performance in terms of biological nitrogen fixation (BNF) traits over the
cultivated C. arietinum GPF-2. On pooled mean basis of 2 years across the zones, the
nodulation (19.7nodules/plant), nodule dry weight (172.8 mg/plant) and leghaemoglobin
content (4.06 mg/g fresh wt. of nodules) were higher in wild over cultivated Cicer species.
The triple interaction of genotypes × locations × years was significant (P0.05) and were used for quantitative trait loci (QTL) analysis. Using
QTL cartographer, markers- CAGM02697, CAGM09835, CAGM09777, CAGM09227,
CAGM09021, CAGM08679 were found linked with QTLs for BNF. These markers can be
validated further for identification of genes for BNF traits and marker assisted selection in
chickpea. To the best of our knowledge this is the first report on identification of markers
associated with key BNF traits in chickpea.
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Citation
Nagpal, Sharon (2021). Mapping of quantitative trait loci (QTLs) associated with biological nitrogen fixation in an interspecific cross of chickpea (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.