Genetic Variability and Hetrosis in Cucumber (Cucumis Sativus L.)
By: Gayathri K.
Contributor(s): Abdul Vahab M (Guide).
Material type:
BookPublisher: Vellayani Department of Horticulture, College of Agriculture 1997DDC classification: 635 Online resources: Click here to access online Dissertation note: MSc Abstract: The present investigation on (Genetic variability and
heterosis in cucumber (Cucumis sativus L.)' was conducted
at the College of Agriculture, Vellayani, Trivandrum during
1995-97. Twenty two genotypes of cucumber collected from
different parts of the country were grown in randomised block
design with two replications and assessed the genetic
variability of fifteen characters. The genetic parameters like
variability, heritability, genetic advance, correlation
coefficients and direct and indirect effects of the component
traits on yield were estimated. Seven parents were selected
based on selection index, crossed in all possible combinations
without reciprocals in a 7x7 diallel and produced 21 Fl
hybrids. These F1 hybrids were evaluated along with their
parents and derived information on general and specific
combining ability and heterosis.
Significant differences were observed among the 22
genotypes for all the fifteen characters studied. Yield/plant,
fruits/plant, average fruit weight and node to first female
flower had the highest genotypic coefficient of variation with
high heritability and genetic advance. Fruits/plant, average
fruit weight, fruit girth and fruit diameter were highly
correlated with yield. Fruit girth exerted the maximum
positive effect on yield followed by average fruit weight and
fruits/plant.
Significant gca and sca variances were observed for
all the traits. CS 12 and CS 9 were good general combiners
for yield. The hybrids CS 12 x Punerikhira, CS 9 x ARC-1 and
BSS 169 x ARC-1 possessed high sca effects for yield.
Significant heterosis were observed for most of the
traits. Relative heterosis, heterobeltiosis and standard
heterosis were significant for days to first female flower
opening. Punerikhira x ARC-1 and CS 9 x Punerikhira were
significantly earlier than the standard variety CS 12. Relative
heterosis and heterobeltiosis were observed for yield/plant.
None of the hybrids exceeded the standard parent. The hybrids
BSS 169 x ARC-1, CS 9 x ARC-l and Punerikhira x ARC-1 showed significant relative heterosis and heterobeltiosis for yield/plant.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
|
KAU Central Library, Thrissur Theses | 635 GAY/GE (Browse shelf) | Available | 171217 |
MSc
The present investigation on (Genetic variability and
heterosis in cucumber (Cucumis sativus L.)' was conducted
at the College of Agriculture, Vellayani, Trivandrum during
1995-97. Twenty two genotypes of cucumber collected from
different parts of the country were grown in randomised block
design with two replications and assessed the genetic
variability of fifteen characters. The genetic parameters like
variability, heritability, genetic advance, correlation
coefficients and direct and indirect effects of the component
traits on yield were estimated. Seven parents were selected
based on selection index, crossed in all possible combinations
without reciprocals in a 7x7 diallel and produced 21 Fl
hybrids. These F1 hybrids were evaluated along with their
parents and derived information on general and specific
combining ability and heterosis.
Significant differences were observed among the 22
genotypes for all the fifteen characters studied. Yield/plant,
fruits/plant, average fruit weight and node to first female
flower had the highest genotypic coefficient of variation with
high heritability and genetic advance. Fruits/plant, average
fruit weight, fruit girth and fruit diameter were highly
correlated with yield. Fruit girth exerted the maximum
positive effect on yield followed by average fruit weight and
fruits/plant.
Significant gca and sca variances were observed for
all the traits. CS 12 and CS 9 were good general combiners
for yield. The hybrids CS 12 x Punerikhira, CS 9 x ARC-1 and
BSS 169 x ARC-1 possessed high sca effects for yield.
Significant heterosis were observed for most of the
traits. Relative heterosis, heterobeltiosis and standard
heterosis were significant for days to first female flower
opening. Punerikhira x ARC-1 and CS 9 x Punerikhira were
significantly earlier than the standard variety CS 12. Relative
heterosis and heterobeltiosis were observed for yield/plant.
None of the hybrids exceeded the standard parent. The hybrids
BSS 169 x ARC-1, CS 9 x ARC-l and Punerikhira x ARC-1 showed significant relative heterosis and heterobeltiosis for yield/plant.
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