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Two cultivars of tulip (Tulipa gesneriana L.) were used to check the effect of trehalose-feeding on longev- ity of vase life. ʻOxfordʼ plants were grown from bulbs, and trehalose-fed cut fl owers were compared with the intact plants grown in pots. ʻPink Diamondʼ fl owers were obtained commercially as cut fl owers from the market, and tre- halose-feeding was examined by using only fl ower parts. In both cultivars of plants, it was confi rmed that trehalose- feeding enhanced longevity of the vase life signifi cantly at room temperature. Additionally, mechanisms of prolonging the vase life with trehalose-fed fl owers were studied by comparing the water status in the zone of elongation of tulip tepals when their growth rates were modifi ed with different treatments. In the elongating region of tulip tepals, cell elongation rates were linearly correlated to sizes of the growth-induced water potential regardless of treatments. It was found that trehalose-feeding reduced the hydraulic conductance, resulting in a decrease in cell elongation rates. Also, trehalose helped to maintain turgor of tepal cells for longer periods. Furthermore, trehalose enhanced pigmentation in tepals, and thus, trehalose is believed to have had a role in altering the metabolism in elongating cells and in reducing hydraulic conductivity in membranes. Since petal growth occurs continuously until cell expansion is completed, petal growth is dependent mainly on cell expansion rates of petal tissues and determines the longevity of cut fl ow- ers (van Doorn, 1997). Recently, it was reported that trehalose, a nonreducing disaccharide consisting of two α-glycosidically linked glucose units, enhanced the vase life of cut tulip fl owers (Iwaya-Inoue and Nonami, 2003; Iwaya-Inoue and Takata, 2001). Trehalose is also known to enhance tolerance against desiccation and high temperature, probably by protecting membranes and enzymes from various stresses (Crowe et al., 1984; Hottiger et al., 1994; Lee et al., 1989). However, trehalose might be toxic for some tissues, because cell wall synthesis has been shown to be inhibited by trehalose feeding in dodder (Cascuta refl exa Roxb.) cells (Veluthambi et al., 1982), and growth of the shoot tip of dodder was completely suppressed in vitro (Veluthambi et al., 1981). Ikeda et al. (2000) reported that trehalose reduced hydraulic conductance in soybean (Glycine max (L.) Merr.) embryos, resulting in growth retardation of embryos. If petal expansion rates are reduced by trehalose feeding, more time will be required for tepal growth to be completed, and thus longevity of the tulip may be prolonged.

Hydraulic Conductance in Tepal Growth and Extension of Vase Life with Trehalose in Cut Tulip Flowers