สำนักงานราชบัณฑิตยสภา

“¬™≈ ‡°µÿ …“ «“√ “√ √“™∫— ≥±‘ µ¬ ∂“π ªï ∑’Ë ÛÛ ©∫— ∫∑’Ë Ò ¡.§.-¡’ .§. ÚııÒ 147 sitivity of Dendrobium ùPompadourû flow- ers following pollination. Journal of Hor- ticultural Science and Biotechnology 75 : 149-153. Ketsa, S. and A. Rugkong. 2000b. The role of ethylene in inhancing the initial ovary growth of Dendrobium ùPompadourû fol- lowing pollination. Journal of Horticul- tural Science and Biotechnology 75 : 451-454. Ketsa, S., A. Wisutiamonkul and K. Roengmonkol. 2005. Role of ethylene in ovary growth and vase life of Dendrobium ùPompadourû flowers. Acta Horticulturae 687 : 71-75. Ketsa, S., A. Wisutiamonkul and W.G. van doorn. 2006. Auxin is required for pol- Dendrobium flowers treated with foreign pollen. Australian Journal of Plant Physiology 25 : 409-415. Ketsa, S. and K. Luangsuwalai. 1996. The relationship between 1-aminocyclopro- pane-1- carboxylic acid content in pol- linia, ethylene production and senes- cence of pollinated Dendrobium or- chid flowers. Postharvest Biology and Technology 8 : 57-64. Ketsa, S. and A. Rugkong.1999. Senescence of Dendrobium ùPompadourû flowers fol- lowing pollination. Journal of Horticul- tural Science and Biotechnology 74 : 608-613. Ketsa, S. and A. Rugkong. 2000a. Ethylene production, senescence and ethylene sen- lination-induced ovary growth in Dendrobium orchids. Functional Plant Biology 33 : 887-892. Luangsuwalai, K. 2007. Physiology and mo- lecular biology of ethylene synthesis in Dendrobium flowers following compat- ible and incompatible pollination. Ph.D. Thesis. Kasetsart University, Bangkok. Mor, Y., M.S. Reid and A.M. Kofranek. 1980. Role of the ovary in carnation senes- cence. Scientia Horticulturae 13 : 377- 383. Uthaichay, N., S. Ketsa and W.G. van Doorn. 2007. 1-MCP pretreatment prevents bud and flower abscission in Dendrobium orchids. Postharvest Bi- ology and Technology 43 : 375›380. Abstract Pollination of Dendrobium Flowers Saichol Ketsa Associate Fellow of the Academy of Science, The Royal Institute, Thailand; Department of Horticulture, Faculty of Agriculture, Kasetsart University Pollination is one the plant processes resulting in vegetation and new varieties all over the world. Pollination can be successful within the same cultivars and different cultivars. We have studied extensively pollination of many Dendrobium cultivars, and found that compatible pollination induced higher ethylene production and longer pollen tube than incompatible pollination. Compatible pollination also induced ovary growth, premature senescence of petals and sepals, epinasty and carotenoid synthesis, while incompatible pollination did not. Compatible pollinia contained higher amounts of ACC (an intermediate of ethylene synthesis) and auxin than incompatible pollinia. Compatible pollinia also contain higher population of pollen grains than incompatible pollinia. Pretreatment of Dendrobium flowers with inhibitors of ethylene production and action, and of auxin action and transportation prior to pollination did not induce ovary growth and post pollination changes. The role of ethylene and auxin in the initial ovary growth will be also discussed. Key words : Dendrobium flower, pollination, ethylene, auxin, pollen, ovary growth, senescence