EFFECT OF GIBBERELLIC ACID ON PLANT GROWTH AND FLOWERING OF CHRYSANTHEMUM CV. THAI CHEN QUEEN UNDER SHORT DAY PLANTING CONDITIONS

APARNA VELURU¹*, PRAKASH KRISHNA², M. NEEMA³, AJAY ARORA⁴, P. NAVEEN KUMAR⁵, M.C. SINGH^6
1Division of Crop Improvement, ICAR-Central Plantation Crop Research Institute, Kasaragod, Kerala 621124, India
²Division of Crop Improvement, ICAR-Central Plantation Crop Research Institute, Kasaragod, Kerala 621124, India
³Division of Crop Improvement, ICAR-Central Plantation Crop Research Institute, Kasaragod, Kerala 621124, India
⁴Division of Plant Physiology, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
⁵ICAR-Directorate of Floricultural Research, Pune, 411005, India
⁶CPCT Unit, ICAR- Indian Agricultural Research Institute, New Delhi, 110 012, India, India
* Corresponding Author : kprakash8007@gmail.com

Received : 01-06-2018     Accepted : 10-06-2018     Published : 15-06-2018
Volume : 10     Issue : 11       Pages : 6274 - 6278
Int J Agr Sci 10.11 (2018):6274-6278

Keywords : Chrysanthemum, flowering, GA3, short day planting conditions
Conflict of Interest : None declared
Acknowledgements/Funding : Author thankful to the Head, Division of Floriculture and Landscaping and the Director, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India for granting access to the necessary facilities for conducting these experiments. We thank the In-charge, CPCT unit, IARI for providing polyhouse facilities. Author also thankful to PG School, IARI for research fellowship for this study.
Author Contribution : All author equally contributed

An experiment was conducted to study the effect of GA3 on plant growth, flowering and its role in substituting the artificial light conditions in chrysanthemum cv. Thai Chen Queen. Three different concentrations (200 mg/L, 300 mg/L and 400 mg/L) of GA3 were sprayed at two different intervals (7th day and 14th day after transplanting) on plants grown in protected conditions during short days. Observations on vegetative and reproductive parameters were recorded during 30, 45 and 60 days after planting. Vegetative growth characteristics like plant height (45.1 cm), inter-nodal length (2.28 cm), and leaf number (28) were more superior in GA3 treated plants compared with control. Plant fresh and dry weights, leaf area index (LAI), net assimilation rate (NAR) and photosynthetic pigments; chlorophyll and carotenoid contents were increased with GA3 application. GA3 application also causes early bud induction in Chrysanthemum cv. Thai Chen Queen. Floral parameters like bud diameter, flower diameter, fresh weight and dry weight as well as increased vase-life of the flowers were observed in GA3 treated plants. GA3 application helps to substitute artificial light conditions which are required for the vegetative growth of the chrysanthemums and also helps to improve the flower quality under short day conditions.

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