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PHENOTYPIC STABILITY FOR SEED YIELD AND YIELD COMPONENTS IN SESAMUM (Sesamum indicum L.)

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Title PHENOTYPIC STABILITY FOR SEED YIELD AND YIELD COMPONENTS IN SESAMUM (Sesamum indicum L.)
 
Creator JHANSI RANI, P
 
Contributor RAMA KUMAR, P.V.
 
Subject sowing, genotypes, planting, yields, environment, animal husbandry, phenotypes, developmental stages, oils, sesamum indicum
SESAMUM, Sesamum indicum L.
 
Description The present investigation was carried out to study the variability,
heritability, genetic advance as per cent of mean, character association, path
coefficient analysis and stability analyses among 10 sesamum (Sesamum
indicum L.) genotypes in 6 environments resulting from six sowing dates. The
data were recorded on 9 quantitative characters (Plant height, days to 50%
flowering, number of primaries, number of secondaries, number of capsules per
plant, number of seeds per capsule, 1000 seed weight, oil content and seed
yield per plant).
The analysis of variance indicated significant differences among the
genotypes for all characters in all six environments studied.
Variability was studied for all the characters and indicated that seed
yield per plant, number of primaries and number of secondaries showed high
variability and further improvement of these traits will be helpful in
improvement of seed yield.
The genotypic coefficients of variation for all the characters studied
were lesser than the phenotypic coefficients of variation indicating the masking
effect of the environment. High heritability coupled with high genetic advance
as per cent of mean was observed for number of capsules per plant, number of
seeds per capsule, seed yield per plant, number of primaries and number of
secondaries.
Correlation study indicated that number capsules per plant, number of
seeds per capsule and 1000 seed weight had significant positive association
with seed yield per plant in all environments and selection may be exercised on
these traits to improve seed yield.
The path analysis indicated that number of capsules per plant, number of
seeds per capsule, 1000 seed weight and plant height had positive direct effects
on seed yield per plant as correlation of these parameters was positive and
significant , direct selection through these characters for improvement in seed
yield per plant should be highly rewarding.
In pooled analysis of variance for stability the genotypes, environments,
genotype-environment interaction, environment (linear) and pooled deviations
showed significant differences for most of the characters studied.
According to Eberhart and Russell regression method, the genotypes,
YLM 106 (number of seeds per capsule and number of capsules per plant),
YLM 82 (number of seeds per capsule, oil content and 1000 seed weight),YLM
17 (seed yield per plant) and Madhavi (1000 seed weight and oil content)
showed stable performance over environments.
According to AMMI analysis, the genotypes (Madhavi, YLM 17, YLM
66 and YLM 80) are stable for seed yield per plant because their IPCA-1 score
is nearer to zero.
The study of different stability parameters indicated the importance and
convenience of stability parameters like Wricke’s (1962) ecovalence, mean
variance due to genotype-environment interaction of ranks, as these methods
gave similar results in spotting the stable genotypes to that of the deviation
from regression (S2d) of Eberhart and Russell (1966) whose calculation is
cumbersome.
 
Date 2016-06-06T11:53:04Z
2016-06-06T11:53:04Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66829
 
Language en
 
Relation D9053;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY