Stability Analysis in Grass Pea [Lathyrus sativus (L.)]
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Date
2007
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Publisher
MPUAT, Udaipur
Abstract
The present study entitled “Stability analysis in grass pea [Lathyrus sativus
(L.)]” was carried-out with sixteen diverse varieties/strains for seed yield, its components
and quality parameters. The material was planted under two locations in four
environments during rabi, 2005-06 and 2006-07 at Udaipur and Kota.
Observations were recorded for eight yield contributing characters and one quality
trait. Variability parameters, correlations and path analysis were computed for each
environment and over pooled basis. Stability parameters were analyzed using the model
(Eberhart and Russell, 1966).
Superior varieties L-18, I-30 and R-33 were identified on the basis of their
consistent per se performance in each environment and over pooled basis for seed yield
and its component traits. I-18, I-30 and R-31 exhibited high seed protein content while I-
30 displayed superiority for seed yield as well as quality characters. Large genetic
advance as percentage of mean coupled with high GCV and heritability were recorded for
pods per plant and plant height in at least one environment and over pooled basis
suggesting that selection for these traits would be effective for seed yield in grass pea.
Association studies revealed that seed yield per plant was positively correlated at
genotypic levels with branches per plant in at least one environment.
Path analysis studies indicated that seed protein content contributed to seed yield
indirectly with negative effect.
A joint regression analysis of variance based over four environments indicated
that genotypes differed significantly for almost all the characters except plant height and
branches per plant. Environmental effects were also significant for all characters. Both
linear and non-linear components were significant for all the characters. However, linear
component was of higher magnitude for pods per plant, days to maturity, branches per
plant, 100-seed weight, days to flowering, seed yield per plant and plant height.
Superior varieties were identified with respect to their phenotypic stability for
different environmental conditions. However, varieties namely I-30, L-08 and I-22
displayed high per se performance, above average response and stability for seed yield
per plant and its components. For quality character varieties R-29, I-22, R-33, and L-07
had high per se performance for seed protein content under high management practices
indicating that these entries could be exploited for solving malnutrition problem in
developing country like India. Thus aforesaid these grass pea varieties appeared the most
promising.
To conclude the present study conducted in four environments at two locations in
two years based over various estimates viz. variability parameters, correlations, path
analysis and stability parameters. Grass pea varieties I-30, L-08 and I-22 appeared to be
the most promising for seed yield as they were not only stable but also had high per se for
pods per plant, 100-seed weight and branches per plant. Among these, R-29, I-22, R-33
and L-07 also possessed high protein content. The results so obtained were critically
discussed to give an impetus to grass pea breeding programme. Thus, stability of seed
yield per plant in L-08 and I-30 varieties was imparted by the stability of its component
characters like pods per plant, seeds per pod, 100-seed weight, days to flower and days to
maturity.
Description
Stability Analysis in Grass Pea [Lathyrus sativus (L.)]
Keywords
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Citation
Raiger and Maloo, 2007