Stability analysis in chrysanthemum (Dendranthema grandiflora Tzvelev.)
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Date
2018-06-07
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College of Horticulture, Venkataramannagudem, Dr.Y.S.R. Horticultural University
Abstract
The present investigation on Stability analysis in chrysanthemum
(Dendranthema grandiflora Tzvelev.) was carried out at College of
Horticulture, Venkataramannagudem, West Godavari district of Andhra Pradesh
during 2017-2018. The experiment was laid out in a Randomized Block Design
with 10 treatments replicated thrice. The treatments included ten cultivars viz.,
Mother Theresa, Pusa Aditya, Reagun Emperor, Akitha, PAU-B-107, Red Gold,
PAU-B-43, Scent Chamanthi, Star White, BC-6-11 planted over three different
environments viz., open field, polyhouse and shade house. The study was aimed
at identifying superior and stable genotypes and analysing the genotype x
environment interaction for improvement of various traits.
Eberhart and Russell (1966) model was adopted for stability analysis in
the present study. The genotypic variance was found significant for all characters
and environmental variance was also significant for most of the traits except
number of primary branches at 40 DAP, number of leaves at 40 and 70 DAP,
number of flowers per plant and fresh weight of flower. The genotype x
environment was significant for all characters except number of primary
branches at 40 and 70 DAT, number of leaves at 70 DAT, chlorophyll content at
40 and 70 DAT, fresh weight at 70 DAT, days taken for 50% flowering, duration
of flowering, in situ longevity of flower, weight of flowers per plant (g), flower
diameter, shelf life and vase life.
The environmental indices were positive for polyhouse in case of most of
the vegetative traits except chlorophyll content. Flowering characters showed
negative EI values in open field indicating earliness to flower but duration of
flowering and in situ longevity of flower possessed a high positive EI values
under shade house indicating that flowers could last longer in this environment.
The environmental indices were positive for yield characters under shade house
indicating favourability of this environment for yield traits. Positive
environmental indices were recorded for flower diameter, stalk thickness, vase
life and shelf life under shade house, whereas flower diameter, average weight of
10 flowers, shelf life, stem thickness and vase life were positive under open field
and stalk length possessed the highest environmental index under polyhouse.
The genotypes Akitha, Reagun Emperor, Red Gold and Scent Chamanthi
were taller with high mean value, regression co-efficient near to unity with non significant deviation from linearity and hence stable with predictable
performance for plant height at 70 DAP. The genotype Pusa Aditya, Akitha and
BC-6-11 were well adapted to different environments with average stability for
number of secondary branches at 70 DAP. The genotypes BC-6-11, Pusa Aditya
and Akitha were found to possess similar degree of stability for leaf area at 70
DAP with predictable performance. Dry weight at 70 DAP recorded the average
stability with Reagun Emperor and Akitha genotypes. With respect to flowering
parameters, the days taken for flower bud initiation worked out to be in the range
of average stability for the genotypes Red Gold, Reagun Emperor, Star White,
Bc-6-11, Mother Theresa and Pusa Aditya genotypes. The genotypes Star White,
Mother Theresa, Reagun Emperor and Pusa Aditya had average stability for days
taken for 100 per cent flowering.
Pusa Aditya and Scent Chamanthi showed stability for yield per plot and
Scent Chamanthi for yield per hectare and therefore considered as well adopted
to all environments. The genotype PAU-B-107 possessed average stability for
stalk length whereas Star White, Red Gold, PAU-B-107 and Akitha recorded
average stability for stalk thickness. The stable genotypes can be used in
breeding programmes for future crop improvement. Among the environment
shade house performance was better compared to other to environments.
Description
1. To assess the magnitude of stability of chrysanthemum varieties across
different environments.
2. To identify the favourable environments for different chrysanthemum
varieties with respect to growth, yield and quality.
3. To analyse the interaction between genotypes and environments in
chrysanthemum for various yield and its attributing parameters