GENERATION MEAN ANALYSIS OF YIELD AND YIELD ATTRIBUTING TRAITS IN LINSEED (Linum usitatissimum L.)
Loading...
Date
2016
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Birsa Agricultural University, Kanke, Ranchi, Jharkhand
Abstract
A study was conducted at Ranchi Agricultural Research farm and Chianki
Research farm during Rabi 2013-14 to evaluate 6 populations i.e. P1, P2, F1, F2, BC1 and
BC2 from six different crosses for generation mean analysis. Investigation was carried
out on variability, nature and magnitude of gene effects, their interactions, heterosis and
inbreeding depression for 17 traits i.e. days to 50 per cent flowering ,days to maturity,
plant height ,number of primary branches per plant, number of capsules per plant,
number of seeds per capsule, capsule diameter, seed yield per plant, test weight, oil
content, palmitic acid content, stearic acid content, oleic acid content, linoleic acid
content, linolenic acid content, wilt disease reaction and rust disease reaction. Thirty
treatments consisting 5 parents, 6F1s, 6F2s, 6BC1s, 6BC2s and one check (LC-54) has
laid out in randomized block design with three replications.
The analysis revealed highly significant variation among the treatments for all the
characters under study at both the locations. Phenotypic and genotypic co-efficient of
variation was high for plant height, number of primary branches per plant , number of
capsules per plant , wilt disease reaction, rust disease reaction and seed yield per plant
at both the locations showing the presence of variability among the treatments for yield
and yield attributing traits.
Similarly high to moderate heritability as well as genetic advance was recorded
for number of capsules per plant, rust disease reaction, wilt disease reaction, oleic acid
content and linolenic acid content indicating that breeding for these traits can be use in
the development of these traits.
The estimates of additive and dominance components through joint scaling test as
well as epistasis interaction through six parameter model indicated that additive
component has significant role in the expression of number of primary branches per
plant, number of seeds per capsule, capsule diameter and test weight at both the locations
indicating that transgressive segregants of these characters can be useful in improvement
of these traits in segregating generations. Dominance component played a major role in
controlling the expression of number of primary branches per plant, number of seeds per
capsule, seed yield per plant, test weight and rust disease reaction at both the locations.
Among epistatic gene interactions, additive x additive (i) and dominance x
dominance (l) interactions effect showed significant impact in comparison to additive x
dominance (j) interaction in controlling the expression of plant height, primary branches
per plant, number of capsules per plant, number of seeds per capsule, capsule diameter,
days to maturity, seed yield per plant, oil content, wilt disease reaction and rust disease
reaction by additive x additive (i) interaction, days to 50 per cent flowering, plant height,
number of capsules per plant and number of seeds per capsule by dominance x
dominance (l) interaction and days to 50 per cent flowering, plant height, number of
capsules per plant, days to maturity, oil content, wilt disease reaction and rust disease
reaction by additive x dominance (j) interaction at both the locations.
Almost all the crosses for all the traits under study exhibited duplicate type of
gene action at both the locations whereas few crosses showed complimentary gene action
for respective traits at only Ranchi location.
Heterosis estimate revealed that the crosses Meera x T-397 and Shekhar x T-397
were found to be the best crosses at both the locations considering the heterotic
advantage of these crosses over mid parent, better parent and economic check LC-54.
The heterosis manifested in these two crosses were mainly due to desirable
heterotic response of important yield component traits like, number of primary branches
per plant, number of capsules per plant , number of seeds per capsule, capsule diameter
and test weight indicating that development of hybrids and better segregants based on
these traits can be fruitful.
Description
GENERATION MEAN ANALYSIS OF YIELD AND YIELD ATTRIBUTING TRAITS IN LINSEED (Linum usitatissimum L.)
Keywords
null