洋桔梗切花吸水性與花梗滲透潛勢及組織構造之關係

The Relationships Between Water Uptake and Osmotic Potential and the Pedicel Structures in Eustoma Cut Flowers

本試驗探討洋桔梗切花吸水性與花梗滲透潛勢及組織構造之關係。洋桔梗切花於瓶插後9天內的吸水量以‘雙白紫’較‘雙綠’為高，‘雙白紫’於瓶插第1天吸水量達0.8 mL為最高。‘雙綠’及‘雙白紫’於瓶插後2天內其花梗滲透潛勢均呈現增加之趨勢，但‘雙白紫’於瓶插10天內均維持較低之滲透潛勢。瓶插前及吸水高峰時，花梗的各部位組織之細胞均飽滿圓潤；萎凋期花梗組織細胞萎縮程度以‘雙白紫’較‘雙綠’為低。兩供試品種於萎凋期之韌皮部及形成層細胞嚴重皺縮，而木質部導管細胞則維持正常之形態。由結果可知，洋桔梗小花花梗於瓶插期間能維持較低之滲透潛勢，則可保持較高吸水能力，以獲得相對較多量的水分。 The purpose of the experiment was to investigate the relationship between water uptake and osmotic potential of the pedicel structures in Eustoma cut flower in the vase. The water uptake ability of pedicels of ‘Shuang-Bair-Tzyy’ cultivars was higher than ‘Shuang-Liuh’ in the beginning 9 days. The water uptake content of ‘Shuang-Bair-Tzyy’ cultivars reached up to its maxi, 0.8ml, on the 1st vase day. The osmotic potentials of pedicels of both cultivars have increased during the beginning 2 days, but ‘Shuang-Bair-Tzyy’ cultivars sustained lower osmotic potential in the beginning 10 days. The cells of pedicel tissue were turgid before vase stage and bad max. water uptake stage. ‘Shuang-Liuh’ had higher cell wilting percentage than ‘Shuang-Bair-Tzyy’ at the silting stage. The cells of phloem and cambium tissue wilted seriously but vessel cells remained unchanged in both cultivars at the wilting stage. The results showed that lower osmotic potential would keep the water uptake ability higher and persist water holding of pedicel tissue during the vase days.