Variability in ridge gourd (Luffa acutangula (Roxb.) L.)
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Date
1998
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Department Of Olericulture, College Of Horticulture, Vellanikkara
Abstract
The present investigation on "Variability in ridge gourd (Luffa acutangula
(Roxb.)L.)" was conducted at the College of Horticulture, Vellanikkara, Thrissur
during 1997-98. Fifty seven accessions of ridge gourd collected from different
parts of the country were grown in a randomised block design with two
replications. The 57 accessions were genetically catalogued based on the
descriptor of ridge gourd and LA 65 was observed as a hermaphrodite accession.
Therefore it was not included in further statistical analysis. The extent of genetic
variability for twenty characters viz. vine length, number of primary branches,
internodal length, days to first female flower, nodes to first female flower, sex
ratio, days to first harvest, fruitset, number of fruits per plant, yield per plant,
average fruit weight, length of fruit, girth of fruit, thickness of flesh, number of
ridges per fruit, seeds per fruit, 100 seed weight, duration of the crop, incidence of
pests and diseases and fibre content were also studied. The fifty seven accessions
were genetically catalogued based on the descriptor of ridge gourd. The genotypic
and phenotypic coeffcients of variation, heritability, genetic advance and genetic
gain were estimated.
Significant difference were observed among the fifty six accessions for
almost all the characters studied. Among the fifty six accessions, the earliest
flowering genotype was LA 37 and the highest yielding genotype was LA 7 for
both the seasons.
High heritability coupled with high genetic gain was recorded for charcters
like vinelength, sex ratio, number of fruits per plant, yield per plant, length of fruit
and seeds per fruit. In both the seasons, the numebr of fruits per plant had the.
highest positive and significant correlation with yield. Also characters like vine
length, number of primary branches, internodal length, days to first female flower,
nodes to first female flower, days to first harvest, fruit set, average fruit weight,
length of fruit and duration of the crop were positively correlated with yield. But
the incidence of mosaic was negatively correlated with yield. The number of fruits
per plant exhibited the highest positive direct effect on yield and days to first
female flower exhibited the highest negative direct effect on yield. Based on the
genetic divergence the 56 accessions were grouped into nine clusters.
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Citation
171406