POLLINATION AND FRUIT SET STUDIES IN CUCUMBER (Cucumis sativus L.)
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Date
2017
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UHF,NAUNI
Abstract
ABSTRACT
The present investigations entitled “Pollination and fruit set studies in cucumber (Cucumis
sativus L.)” were carried out at the Experimental Research Farm, Department of Vegetable Science,
Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during Kharif, 2016 to
gather information on use of chemicals (Gibberellic acid, Silver nitrate and Silver thiosulphate) in
modification of sex expression in gynoecious varieties (GYNO-1 and GYNO-2) of cucumber, floral
biology and also to assess the efficiency of different system of pollination on fruit and seed setting
and their characteristics in monoecious (K-75 and UHF-CUC-101) and gynoecious (GYNO-1 and
GYNO-2) varieties. The experiment was laid out in a RCBD with three replications. Use of chemical
in modification of sex expression, floral biology, fruit and seed setting studies were assessed through
factorial analysis in randomized block design and completely randomized design proposed by Panse
and Sukhatme (2000). The observations were recorded on use of chemicals in modification of sex
expression in gynoecious lines (induction of male flowers), pollination studies, time of anthesis,
dehiscence, pollen viability(%), stigma receptivity, node number bearing first female flower, average
fruit weight (g), number of seeds per fruit and thousand seed weight (g). Amongst the various
chemical used, silver thiosulphate was found best for the induction of staminate flower in gynoecious
cucumber at 500ppm. Anthesis started at 6AM and completed by 8AM with the maximum anthesis
between 6AM to 7AM in monoecious varieties whereas, in gynoecious varieties it was maximum upto
6:00AM in both open and controlled conditions and similar pattern was observed for dehiscence.
Dehiscence occurs soon after anthesis. Maximum pollen viability was recorded on the day of anthesis
and viability of pollen under refrigerated condition does not decreased as rapidly as it was under room
temperature condition with the duration of pollen storage. Maximum stigma receptivity was noticed at
anthesis time and pollination during this interval recorded maximum fruit set. A higher fruit set was
observed in case of open pollination as compared to self pollination method. Gynoecious lines were
earlier in flowering and fruiting than monoecious varieties. Open pollination had better effect on fruit
and seed characteristics as compared to self pollination.
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