GENETIC ASSESSMENT FOR YIELD, ITS COMPONENT TRAITS AND THEIR RESPONSES TO BRUCHID INFESTATION AMONG GERMPLASM ACCESSIONS OF HORSE GRAM [Macrotyloma uniflorum (Lam.) Verdcourt]
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Date
2019-08-08
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
Horse gram is an important unexploited annual grain legume crop tolerant to
drought and hence suitable for marginal lands. With this background 230 horse gram
germplasm accessions were evaluated for variability analysis, qualitative traits and
response to bruchids in two different years (2017rabi and 2018rabi ) at k-block University
of Agricultural Sciences, GKVK, Bengaluru. Genetic variability studies revealed high
genotypic co-efficient of variability, phenotypic co-efficient of variability, heritability for
secondary branches plant-1, clusters plant-1 and pods plant-1. These 230 germplasm lines
were grouped into five clusters and cluster III was the largest group comprising of 88
genotypes. Out of nine traits studied, clusters plant-1 has contributed highest towards the
genetic divergence followed by pod yield plant-1 and seed yield plant-1. The quantitative
trait mean differences and trait variance between clusters were significant for all nine traits.
The genotypes IC 139460, IC 94599, NS-04-11, RJR-94, IC 426569 and IC 106915 have
exhibited high values for all the quantitative traits studied. Significant morphological
variations were observed among the genotypes for qualitative traits such as flower colour,
seed colour, pod shape, growth pattern, maturity types, seed colour and stem colour. Pulse
beetle (Collosobru chuschinensis) affects the seeds by causing a loss up to 55-60 % in seed
weight and 45.5-66.3 % loss in seed protein content. 50 horse gram germplasm accessions
were evaluated for response to bruchids. Accessions IC 108076, SS-357, RJR-86 were
identified as resistant against Collosobruchus chinensis with susceptibility index of 1.95,
2.34 and 2.36 respectively.