Carbohydrate changes during flower senescence of Easter lily (Lilium longiflorum Thunb)
J.S. Lee, M.S. Roh, and K.C. Gross
International Horticultural Congress, Toronto, Canada. 2002 . Abstract No. 1124
2002
บทคัดย่อ
Flowers are composed of various organs which are at various developmental stages. In Lilium, changes in carbohydrates during flower development have not been investigated. Therefore, this research was initiated to examine changes in ethanol soluble carbohydrates and cell wall neutral sugar composition in various floral organs during tepal senescence of L. longiflorum, Easter lily flowers. Tepals began to lose their firmness and creamy-white color 6 days post-anthesis, turned brown (necrosis) 8 dats post-anthesis. Tepal fresh weight increased during the first 2 days after anthesis. However, the fresh weight of the stigma and ovary increased relatively slowly, reaching a maximum 7 days after anthesis. Exudate was produced beginning 4 days post-post-anthesis. Ethanol soluble (70%; v/v) carbohydrates and cell wall-related, non-cellulosic neutral sugars of various floral organs and floral exudates were analyzed. Glucose was detected during tepal senescence; however, sucrose was not. Arabinosyl and galactosyl residues were only detected in polysaccharides from exudates produces at latter stages of flower development. In tepals, soluble glucose level decreased, while sucrose and fructose levels increased immediately after anthesis and then decreased. The level of soluble sucrose of anthers was highest 2 to 3 days post-anthesis. On the contrary, the level of glucose and fructose reached their lowest levels, thus limiting available carbon sources in anthers after anthers after anthesis. The xylosyl, galactosyl, rhamnosyl, non-cellulosic glucosyl, mannosyl, and arabinosyl contentsw of cell wall materials decreased by 50% 3 days post-anthesis. Galactose content was the major cell wall sugar residues, during the entire period of flower bud development.