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GENERATION MEAN ANALYSIS IN SESAME [Sesamum indicum (L.)]

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Title GENERATION MEAN ANALYSIS IN SESAME [Sesamum indicum (L.)]
 
Creator PATIL, SANDIP A.
 
Contributor DESAI, R.T.
 
Subject planting, genes, sowing, developmental stages, additives, yields, crossing over, genetics, biological phenomena, oilseeds
 
Description The genetic system of seed yield and its component traits
like days to 50% flowering, days to maturity, plant height, number
branches per plant, number of capsules per plant, number of seeds
per capsule, length of capsule, capsule girth, 1000 seed weight,
seed yield per plant and oil content were analyzed through
Generation Mean Analysis using six generations (P1, P2, F1, F2 ,
BC1 and BC2) of the six crosses viz., G Til-1 x KMR-22, G Til-2 x
JLT-26, G Til-3 x KMR-49, G Til-10 x JLS-9707-2, NIC-79/13 x
KMR-39, PT-1 x JLS-116.
The experiment was laid out in Compact Family Block
Design with three replications at the College Farm, N. M. College
of Agriculture, Navsari Agricultural University, Navsari and
Cotton Research Sub-station, Acchalia during Rabi 2011-12. The
data was recorded on five competitive and randomly selected
plants from each plot of parents and F1s, ten plants in each plot of
both backcrosses and twenty plants in each plot of F2s. To decide
adequacy of additive-dominance model, simple scaling tests were
Abstract
employed. The Joint Scaling Test was also applied to test
adequacy of 3 and 6 parameter models. Wherever, this simple
additive-dominance model failed to explain the variation in
generation means, 6 parameter models was used to estimate major
and interaction effects.
The analysis of variance revealed significant differences
among various generations for majority of the characters in all the
crosses, indicating presence of appreciable amount of variability in
the materials tested. Inadequacy of additive- dominance model was
evident by the significance of scaling tests A, B, C and D
indicating presence of non-allelic gene action in most of the
crosses for various traits studied.
The crosses G Til-1 x KMR-22, PT-1 x JLS-116, G Til-2 x
JLT-26 recorded significant positive heterosis over better parent
for seed yield per plant and its related components. The per se
performance of these crosses was also higher for the respective
traits at both the locations. Crosses showing high heterotic effects
for seed yield and its contributing characters also manifested
significant inbreeding depression which indicated involvement of
dominance gene effects in the expression of the various traits.
The results revealed that both additive and dominance gene
effects were significant for majority of the traits in all six crosses
studied, however the magnitude of dominance gene effects was
higher than the additive effects in all the crosses for majority of
the traits which indicated pre-dominant role of dominance gene
effects in the inheritance of yield and its components. Duplicate
Abstract
type of epistasis contributed maximum in the expression of yield
and its components, followed by complementary epistasis.
The estimates of narrow sense heritability for seed yield
per plant and its attributes were in general high to moderate or low
in majority of crosses. While the magnitude of genetic advance for
most of the yield and its contributing traits was moderate to low
this suggested that further improvement in the traits through
selection would be slow.
The present study therefore, revealed the importance of
additive and dominance gene effects along with additive x additive
and dominance x dominance interactions in the inheritance of traits
studied in six crosses. However, the type of gene action in the
individual crosses for the individual traits revealed that there
existed cross to cross variation in respect of gene effects
governing the inheritance of the particular character. The study
therefore signifies the need of utilizing specific breeding approach
to fully exploit the population under study. Magnitude of nonfixable
component was high for seed yield and some of its
components. Diallel selective mating or biparental mating in early
segregating generations might prove to be effective approach in
further enhancing the seed yield. In some crosses fixable
components were significant, positive and of considerable
magnitude for yield and its components. Directional selection
would be beneficial in isolating more efficient segregants in these
crosses for important yield contributing characters which
ultimately helps in further elevating the yield potential.
 
Date 2016-05-02T10:22:14Z
2016-05-02T10:22:14Z
2013-04
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65712
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari