Studies on drought tolerance, genetic divergence and character association in mothbean [Vigna aconitifolia (Jacq.) Marechal]
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Date
2006
Authors
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Journal ISSN
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Publisher
CCSHAU
Abstract
The objectives of the present study were to study the
physiological basis of drought tolerance in mothbean, to determine the yield
component under dry land conditions, to identify diverse and elite genotypes
and suggesting breeding method for further improvement in mothbean. The
experiment was conducted during Kharif, 2002 at research area, CCS
Haryana Agricultural University, Hisar. In the present investigation, 43
genotypes of mothbean were grown in randomized block design with four
replication accommodating spacing 30× 10 cm. Observation on 5 competitive
plants for recording of data on different physiological traits and yield
components were taken.
Substantial amount of coefficient of variation was observed for all the
traits/characters under study. A wide range for different traits/characters
were also observed.
The higher phenotypic coefficient of variation over genotypic coefficient
of variation showed in almost all the traits/characters. The estimation of
-iv-
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high heritability with high genetic advance was recorded for pod per plant in
both the environments while in case of physiological traits it was observed for
water retention. On the basis of D2-value 43 genotypes were grouped into
nine cluster in E1 and eight in E2. There was no association between
clustering pattern and ecogeographical distribution of the genotypes. RMO
257, RMO 40 and Jwala are released varieties were clustered into same
cluster in both the environment.
In almost all the cases phenotypic correlation coefficient was more
than genotypic correlation coefficient. Correlation studied revealed significant
positive association of seed yield per plot with 100-seed weight, seed yield per
plant, pod per plant, pod per cluster in both environment.
Path analysis revealed that maximum direct effect on seed yield per
plant was through yield per plot and pod per cluster in E1 and E2
respectively. An examination of the trend of correlation revealed that the yield
per plot, pod per plant, pod per cluster, pod length and 100-seed weight were
the important characters that exerted the greatest influence both directly and
indirectly upon seed yield per plant. These characters were important
components in almost all correlations that involved seed yield.
On basis of membrane stability the best performing
genotypes/varieties were IC 329051, IC 311448, IC 329044 and RMO 257.
On basis of the canopy temperature depression the best performing
genotypes/varieties were IC 329051, IC 311448, IC 329044, IC 329090, IC
370471, IC 329037, IC 311427 and RMO 40. RMO 40 and RMO 257 were
observed as best performer for high water retention.