STUDIES ON HETEROSIS, COMBINING ABILITY AND EFFECT OF ETHREL ON SEX EXPRESSION IN VEGETABLE TYPES OF Cucumis melo L
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Date
1990
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.
Abstract
The diallel cross was used to evaluate ten
open pollinated lines of vegetable types of Cuqumis
melo for several characters related to earliness,
quality, flowering and yield. Heterosis was
significant for all characters studied. Both general
combining ability and specific combining ability
variances were significant for all traits. Additive
gene action had a predominant role for fruit size,
acidity, number of male and female flowers, number of
fruits per plant and average fruit weight, while nonadditive
gene action had a predominant role for days to
female flowering, node number to first ferna+e flower,
flesh thickness, cavity diameter, total soluble
solids, sex ratio, percentage fruit set, total yield by
weight and number of main branches per plant.
Evaluation of these ten lines and predicted values
for the characters in the synthetic breeding
populations formed from five selected parents are
presented. It was found that the crosses cs-2 x cs~,
cs-2 x cs-6, cs-4 x cs-s and cs-9 x CS-10 can be
utilized as F1 hybrids.
Four concentrations of ethrel were applied
twice as foliar sprays, once at two-true leaf stage
and again after ten days. Ethrel treated plants
produced the pistillate flowers earlier and increased
their number, delayed the production of staminate
flowers and reduced their number. Ethrel at 250 ppm
was the most effective concentration for sex conversion
in vegetable types of Cucumis melo. Hybrid seed
production with the use of ethrel is discussed.
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Keywords
STUDIES, HETEROSIS, COMBINING, ABILITY, EFFECT, ETHREL, SEX, EXPRESSION, VEGETABLE