Pratima Bagale; Srijana Pandey; Pradip Regmi; Subhekchhya Bhusal
Abstract
This review provides a comprehensive overview of the basic and applied aspects of gibberellins (GAs) and its application in the regulation of growth and development of different vegetable crops. Plant growth regulators are the substances which are synthesized in particular cells and are transferred to ...
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This review provides a comprehensive overview of the basic and applied aspects of gibberellins (GAs) and its application in the regulation of growth and development of different vegetable crops. Plant growth regulators are the substances which are synthesized in particular cells and are transferred to other cells where in extremely small quantities influence the developmental processes. The GAs are an important group of phytohormones which exert various effects on promotion and regulation of plant growth. Gibberellic acid (GA3) is a type of GA plant hormone, with great economical and industrial importance. GAs affect stem elongation, germination, elimination of dormancy, flowering, sex expression, flooding responses, enzyme induction and leaf and fruit senescence. Foliar application of GA3 has been shown to change the physiological and developmental processes, including plant vegetative growth, sex expression, yield, and yield components in different vegetable crops. This study aims to reveal the impacts of GAs on different aspect of crop production with special emphasis on vegetable crops. Furthermore, appropriate concentration for the applications of GA3 in vegetable crops would be discussed so that the use of such regulators is environmentally and toxicologically safe for both plants and the consumers.
Mohammad Gerdakaneh; Fariba Hoseini; Nasrin Eftekharinasab
Abstract
In order to evaluate the effect of plant growth regulators on sex determination and yield, an experiment was conducted by spraying different hormonal combinations on medicinal pumpkin. Experimental treatments were included different concentrations of NAA (25, 75, 100, 125 mg/l), paclobutrazol (50, 100, ...
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In order to evaluate the effect of plant growth regulators on sex determination and yield, an experiment was conducted by spraying different hormonal combinations on medicinal pumpkin. Experimental treatments were included different concentrations of NAA (25, 75, 100, 125 mg/l), paclobutrazol (50, 100, 200 and 300 mg/l) and combination of growth regulators (NAA 25 mg/l + PBZ 50 mg/l), (NAA 75 mg/l + PBZ 100 mg/l), (NAA 100 mg/l + PBZ 200 mg/l), (NAA 125 mg/l + PBZ 300 mg/l), and control (no application of growth regulators). Growth regulators were applied on the plants by spraying at the –two-leaf and four-leaf stages. Results showed that spraying paclobutrazol and NAA caused increase in number of female flowers, fruits per plant, seeds per fruits, 1000 seed weight and seed yield per hectare, but the number of male flowers and ratio of male to female flowers were decreased compared to their values in control plants. The highest fresh and dried seed yield of pumpkin seed was obtained with 50 mg/l paclobutrazol.
