Hybrid
seed production :
Growth
regulators can be used as an aid in hybrid seed production. Use of ethephon has
been used for producting temporary female lines in some cucurbits.
Successful
F1 hybrid in butter- nut squash has been made by using female line produced
with ten weekly sprays of ethephon plant growth regulators have also been used
for maintenance of gynoecious lines.
· Silver nitrate at 500 mg/l has been
reported to be as effective as GA3 in
inducing male flowers on gynoecious lines of cucumber.
· However, in muskmelon foliar sprays
of silver thiosulphate at 400 mg/l was found best for induction of male flower
on gynoecious lines.
Fruit Set :
· Poor fruit set is a major problem in
tomato, brinjal and chillies which is frequently caused by adverse weather
conditions during flowering.
· Plant growth regulators have been
reported to enhance fruit set under both normal and adverese weather
conditions.
Parthenocarpy
:
· Studies on use of growth regulators
in many vegetables have shown an increase in the fruit size with their
applications.
· The role of plant growth regulators
in fruit development can also be seen from the fact that withtheir help it is
possible to stimulate fruit development without fertilization (parthenocarpic).
· In brinjal, application of 2,4-d at
0.00025% in lanolin paste to cut end of styles or as foliar sprays to freshly
opened flower cluster has been reported to induced parthenocarpy.
Fruit
Ripening :
· Ethephon, an ethylene releasing
compound, has been reported to induce ripening in tomato and paper.
· Field application of ethephon at 1000
mg/l at turning stage of earliest fruits induced early ripening of fruits thus
increasing the early fruit yield by 30-35%.
· Pst-harvest dip treatment with
ethephon at 500-200 mg/l has also been reported to induce ripening in mature
green tomatoes.
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