EFFECT OF BENZYLADENINE ON FLOWERING OF A Dendrobium sonia ORCHID IN CASE OF GREENHOUSE CONDITION

Abstract

Dendrobium orchids are popularly used as cut flowers because they come in a wide range of vibrant colours besides being able to produce high number of flowers per inflorescence. There is a significant interest in developing methods to promote early flowering in commercial Dendrobium orchids. The greenhouse experiment were conducted on Dendrobium sonia orchid and arranged in Randomized Complete Block Design with three replications in nethouse condition at Ho Chi Minh city. In this study, the potential effect of Benzyladenine (BA) on inducing inflorescence production of Dendrobium hybrid (Dendrobium sonia) was investigated. Dendorobium sonia plantlets were subjected to spray containing different BA concentrations (30 ml/plant) at concentration from 45 to 120 ppm. The results indicated that the application of BA increased the percentage of inflorescence production, induced earlier flowering, and contributed to the differences in inflorescence length and the number of leaves and flowers produced. The the application of BA at 90 ppm was suitable in improvement the percentage of visible inflorescence, flower diameter, number of flowers on the first inflorescence, number of flowers on pseudo-bulb and flower life. This study showed that BA is a potential plant growth regulator that can speed up the flowering process of Dendrobium sonia in greenhouse condition at Ho Chi Minh city, Viet Nam.