Effect of Pinching and Growth Regulators on Vegetative and Physiological Parameters

Abstract

Chrysanthemum flowers have both ray and disc florets, but the disc florets only can reproduce. The vase life of chrysanthemum is 7-14 days. Largest producers of cut chrysanthemum in the world are Netherland, Mexico, Italy, Spain, and Korea. Largest chrysanthemum producing states in India are

Effect of Plant Growth Regulators on Growth, Flowering, Yield and Vaselife of Chrysanthemum (Dendranthema grandiflora) under Prayagraj Agro Climatic Conditions

“…Flower diameter was found maximum in the treatment T9-GA3@150ppm (10.20 cm), followed by the treatment T8-GA3@100ppm (9.73 cm) and the minimum is found in the T0control (5.60 cm). Limited pinching leads to limited production of primary branches on main stem, secondary branches on primary branches and production of lesser number of flower buds leads to the diversion of photo assimilates to the existing flowers in the plants, results in maximum flower diameter [3]. These findings are in line with those of Aparna et al [4] and Kumar et al…”

“…This is due to increase photosynthesis and respiration along with enhanced fixation by GA3 that leds to flower bud initiation [8]. These findings are in conformity with Mounika et al [3]. The minimum days taken for 50% flowering was found in the treatment T9-GA3@150ppm (113.43 days), followed by the treatment T8-GA3@100ppm (114.20 days) and the maximum days taken for 50% flowering was found in T0-control (120.43 days).…”

“…Maximum number of flowers per plant was noted in the treatment T9-GA3@150ppm (48.53), followed by the treatment T8-GA3@100ppm (47.63) and the minimum number of flowers per plant was noted in T0-control (40.73). Due to apical dominance and differentiation of axillary and apical buds developed on primary and secondary branches into floral meristems through diversion of extra energy into branches which leads to produce more number of flowers per plant [3]. These findings are in conformity with Kuri et al…”

“…The minimum days taken for 50% flowering was found in the treatment T9-GA3@150ppm (113.43 days), followed by the treatment T8-GA3@100ppm (114.20 days) and the maximum days taken for 50% flowering was found in T0-control (120.43 days). GA3 application enhance the translocation of food material for the development of floral primordia which leads to early flowering [3]. Similar results were reported by Patel et al [2] and Mishra et al…”

“…In India, the largest chrysanthemum producing states are Andhra Pradesh, Karnataka, Tamil Nadu, West Bengal and Gujarat. It is cultivated in almost all the states with an estimated area of about 16,630 hectares with a total production of 17,937MT as loose flowers and 5,720MT as cut flowers [3]. It is a typical short day plant and is planted during July and August months under North Indian conditions; so that initial long day and subsequent short day condition facilitate proper vegetative growth of the plants.…”