QUANTITATIVE TRAIT LOCI MAPPING FOR AGRONOMIC TRAITS IN CHICKPEA (Cicer arietinum L.)
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Date
2013
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MPKV, UNIVERSITY LIBRARY RAHURI
Abstract
The present investigation entitled “Quantitative trait loci mapping for agronomic
traits in chickpea (Cicer arietinum L.)” was carried out with the object to identify the QTLs
linked to growth, yield and yield components in chickpea germplasm. Chickpea is a self
pollinated diploid grain legume. It is second most important pulse crop worldwide in terms of
area under cultivation but ranks third in production. It is a traditionally low-input and lowly
yielding crop in the farming system of Indian subcontinent, where it is main part of the daily
diet of majority of the population. The low yield of chickpea is mostly due to biotic and
abioic stresses and it does not give proper responses to inputs such as irrigation and fertilizer.
Molecular marker based association maps have been useful in identifying and localizing
important genes controlling yield related traits.
The set of 240 genotypes were phenotypically evaluated. Eighteen traits were
observed and phenotypic data were recorded. The QTL analysis was carried out only for
seven quantitative traits viz. days to 50% flowering, days to maturity, plant height, number ofpods per plant, grain yield per plant, grain yield per line and 100 seed weight. The promising
192 genotypes based on phenotypic data were selected for molecular analysis. Out of these
187 were used for QTL analysis with 16 SSR markers. In this germplasm, 16 significant
QTLs were identified for growth and yield related seven traits. Using the relax criteria of
p<0.05, large number of associations were found, however, majority of them did not passed
the false discovery rate (FDR) criteria. Two QTLs were identified for days to 50% flowering
on LG1 and LG5. One QTL each for plant height and days to maturity on LG3 and LG5 was
identified, respectively. Three QTLs were identified on LG5 for number of pods per plant
while two putative QTLs were identified for grain yield per plant. For grain yield per line
two significant QTLs were detected on LG5 and LG6. Seven QTLs for 100-seed weight were
identified on different LGs viz. LG1, LG2, LG3, LG5 and LG8. These QTLs and the markers
associated with them can be used in the marker-assisted selection programme aimed at
chickpea improvement.
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