Effects of Putrescine on Vase Life of Cut Dendrobium Inflorescences

Abstract

The effects of three concentration levels of putrescine 10, 20 and 40 ppm in combination with 200 ppm (8-HQS), with or without 1% (w/v) sucrose on the quality and vase life of cut Dendrobium cv. Khao Sanan inflorescences were tested in this experiment. Thereafter, best performed treatment was tested with three commercial cut Dendrobium cultivars such as Khao Sanan, Sonia Bom and Queen Pink. The treated inflorescences were placed under 4 μmol m-2 s-1 fluorescent light intensity at 25°C temperature and 80% relative humidity. Physiological changes were examined in every two days interval. The highest bud opening was exhibited from vase solution of 20 ppm putrescine with 200 ppm 8-HQS and 1% sucrose solution (63.25%). The minimum bud yellowing (9.71%) and maximum vase life (25.6 days) were reported from 10 ppm putrescine with 200 ppm 8-HQS and 1% sucrose solution. it was subjected to efficiency test with other two cultivars. The selected vase solution; a mixture of 10 ppm putrescine, 200 ppm 8-HQS and 1% sucrose was significantly prolonged the vase life of cut Dendrobium cvs. Khao Sanan, Sonia Bom and Queen Pink inflorescence. Meanwhile, it increased the quality of flowers, reduced the bud yellowing and ethylene production as well as promoted the bud opening. Therefore, putrescine could be used as the vase treatment for prolonging vase life of cut Dendrobium inflorescences.