GENETIC DIVERGENCE STUDIES FOR YIELD AND YIELD ATTRIBUTES IN OKRA (Abelmoschus esculentus (L.) Moench.) GENOTYPES
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Date
2019-06-10
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College of Horticulture, Rajendranagar, HYD-30
Abstract
Twenty six okra accessions were evaluated in randomized block design with
three replications at Department of Vegetable Science, College of Horticulture,
Rajendranagar, Hyderabad, during kharif- 2018 and assessed for their diversity,
genetic variability, heritability and genetic advance for twenty parameters concerned
with growth, yield and quality.
The analysis of variance revealed significant difference for twenty characters
studied suggesting considerable amount of variability existing among the genotypes.
Wide range of variability was observed for plant height, number of fruits per plant,
number of nodes per plant, yellow vein mosaic virus infestation and fruit yield per
plant indicating the scope for selection of suitable initial breeding material for
further improvement.
Mahalanobis D2 analysis grouped 26 genotypes of okra into six clusters. The
cluster VI showed maximum intra-cluster distance and maximum inter-cluster
distance was observed between clusters II and VI. Yellow vein mosaic virus disease
incidence contributed maximum (80.31%) to the genetic diversity followed by total
chlorophyll content (13.85%), crude fibre content (4.00%), total phenolic content
(0.62%), number of nodes per plant (0.31%), number of ridges per fruit (0.31%),
fruit yield per plant (0.31%) and fruit weight (0.31%). Heterosis studies can be
planned by involving genotypes belonging to cluster I and cluster II.
The genotypic and phenotypic coefficient of variability were high for plant
height, number of branches per plant, internodal length, fruit length, fruit weight,
number of fruits per plant, number of nodes per plant, crude fibre, total chlorophyll
content and yellow vein mosaic virus infestation on plants. High heritability
coupled with high genetic advance over mean was observed for plant height,
number of branches per plant, internodal length, days to first flowering, days to 50
per cent flowering, days to first harvest, number of fruits per plant, fruit length, fruit
girth, fruit weight, number of fruits per plant, fruit yield per plot, fruit yield per
hectare, number of nodes per plant, number of ridges per fruit, total phenolic
content, total chlorophyll content, crude fibre and yellow vein mosaic virus
infestation on plants indicating predominant additive gene action offering scope for
improvement of these characters through direct selection.
Correlation studies revealed significant and positive association of fruit yield
per plant with plant height, internodal length, fruit length, fruit weight, number of
fruits per plant, fruit yield per plot, fruit yield per hectare and crude fibre content.
Path analysis studies revealed high direct effect of plant height, number of branches
per plant, internodal length, days to first harvest, average fruit weight, number of
fruits per plant, number of nodes per plant, total phenolic content and total
chlorophyll content on fruit yield per plant.
The minimum incidence (0.00%) of YVMV disease was observed in
genotypes viz., IC-140952, IC-140978, IC-90386, IC-140967, IC-90388 and IC-
90442. Hence, these genotypes can be utilized in crop improvement programme as
donor parents for improving YVMV disease resistance.
In the present investigation it is concluded that the genotypes IC-003769, IC-
0113356 and RCHB-17S-42 found to be superior with respect to yield and yield
related parameters compared to other genotypes.
Description
Correlation studies revealed significant and positive association of fruit yield
per plant with plant height, internodal length, fruit length, fruit weight, number of
fruits per plant, fruit yield per plot, fruit yield per hectare and crude fibre content.
Path analysis studies revealed high direct effect of plant height, number of branches
per plant, internodal length, days to first harvest, average fruit weight, number of
fruits per plant, number of nodes per plant, total phenolic content and total
chlorophyll content on fruit yield per plant.
The minimum incidence (0.00%) of YVMV disease was observed in
genotypes viz., IC-140952, IC-140978, IC-90386, IC-140967, IC-90388 and IC-
90442. Hence, these genotypes can be utilized in crop improvement programme as
donor parents for improving YVMV disease resistance.
In the present investigation it is concluded that the genotypes IC-003769, IC-
0113356 and RCHB-17S-42 found to be superior with respect to yield and yield
related parameters compared to other genotypes.
Keywords
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Citation
Sri Konda Laxman Telangana State Horticultural University, Rajendranagar, Hyderabad-30