GENETIC STUDIES IN F2 PROGENY OF SIXTEEN KENAF CROSSES (Hibiscus Cannabinus L.)
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Date
1991
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Abstract
F2 population of sixteen intervarietal crosses of Kenaf
(Hibiscus Cannabinus L.) were subjected to genetic analysis
for variability, heritability, genetic advance, character
association and path analysis on nine quantitative
characters viz., plant height, basal stern diameter, number
of nodes, days to 50% flowering, fresh plant weight, fibre
length, fibre-wood ratio, bark thickness and fibre weight
per plant.
Analysis of variance revealed that the material used in
the present investigation possessed moderate to high genetic
variation for all the characters under study except for
basal stern diameter.
High estimates of genotypic and phenotypic coefficient
of variation were observed for fresh plant weight, and
moderate for bark thickness, while low coefficients of
variation were found for remaining characters under study.
Among the crosses studied, the crosses viz., AMC-8/AMC-15
for plant height, AMC-108/AMC-14 for basal stem diameter and
fresh plant weight, AMC-8/Ar.1C-7 for number of nodes, AMC-
. 53/AMC-7 for days to 50% flowering, AMC-53/AMC-15 for fibre
length, bark thickness and fibre weight per plant and MT-
867/HC-683 for fibre-wood ratio, exhibited high variability.
THe above crosses could be advanced further, for the
improvement in Kenaf.
Additive gene action was found to be predominant for
the characters plant height and fresh plant weight.
Selection can be exercised for obtaining improvement of
these traits more effectively. Both additive and nonadditive
gene affects were observed for the remaining
characters. Careful and restricted selection can be
exercised in these populations ·to exploit the non-additive
gene action.
The character association studies revealed that, the
characters viz., plant height, fibre length, bark thickness,
fibre-wood ratio and basal stem diameter are positively
correlated with fibre yield per plant.
The path coefficient• studies revealed that fibre
weight per pl~nt can be improved by exercising selection on
plant height, basal stem diameter, fresh plant weight, fibre
length, fibre-wood ratio and bark thickness as these traits
manifested positive, direct effect along with positive
correlation with fibre yield.
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Keywords
Genetic, studies, F2, progeny, sixteen, Kenaf, crosses