STUDIES ON GENETIC VARIABILITY IN GAILLARDIA (Gaillardia pulchella Foug.)
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Date
2013-07
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K.R.C. COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
An investigation with twenty genotypes of gaillardia was carried out to
generate information on genetic variability, character association and path analysis at
Department of Floriculture and Landscaping Architecture, Kittur Rani Channamma
College of Horticulture, Arabhavi during August to February, 2012-2013.
Analysis of variance for different quantitative characters revealed significant
differences among the genotypes for most of the parameters. The phenotypic
coefficient of variation was more than genotypic coefficient of variation for all the
studied characters, indicating the role of environmental factors for the expression of
these characters. However less difference was observed for genotypic and phenotypic
variance for number of branches, number of leaves, stem girth, chlorophyll content,
number of flower per ha, flower diameter, number of whorls per flower and number
of florets per flower indicating the fact that these characters are not much influenced
by environmental factors. This also suggests the presence of sufficient variability,
which can be exploited by practicing pureline selection.
High heritability with high genetic advance as per cent of mean (GAM) were
observed for plant height, number of leaves, number of branches per plant, leaf area,
chlorophyll, days taken for first flowering, flower yield per plant, flower yield per
hectare, seed yield per plant and seed yield per hectare, flower diameter, number of
whorls per flower, number of petals per flower, stalk length, single flower weight and
ten flower weight, this indicating the possible role of additive gene action. Which can
be further improve by selection.
Correlation studies revealed that highly significant and positive association of
flower yield per plant with days taken for first flowering, duration of flowering,
flower diameter, number of florets per plant, number of whorls per flower, ten flower
weights and single flower weight. Also number of branches, number of leaves and
leaf area also showed significant and positive correlation with flower yield, indicating
the possibility of simultaneous selection for these traits to improve the flower yield.
Path analysis for flower yield per plant was directly and positively influenced
by days taken for first flowering, days taken for 50 percent flowering, flower
diameter, number of petals per flower, number of whorls per flower, which indicated
the possibility of increasing flower yield by selecting the genotypes for these
characters directly.
Per se performance suggested that AGS-17, AGS-8, AGS-10 and AGS-18
were found promising for flower yield.
Description
TH449
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