Effects of continuous treatments with glucose, sucrose, mannitol, or a combination, on the vase life of cut snapdragon flowers
2006
Ichimura, K.(National Inst. of Floricultural Science, Tsukuba, Ibaraki (Japan)) | Hisamatsu, T.
Glucose, fructose, and mannitol are major soluble carbohydrates in snapdragon (Antirrhinum majus L.). We investigated the effects of continuous treatments with 30 or 50 g L-1 glucose, 50 g L-1 sucrose, or 30 or 50 g L-1 mannitol on the vase life of cut snapdragon flowers (i.e., the time until all florets had wilted). Treatments with each of the carbohydrates promoted floret opening and extended vase life. Glucose at 30 g L-1 increased the number of open florets most, and mannitol at 50 g L-1 extended the vase life most. However, open florets in mannitol treatments were smaller than in glucose or sucrose treatments and their pigmentation was less pronounced than in the glucose and sucrose treatments. The total leaf chlorophyll contents decreased with time, but 30 g L-1 glucose mitigated this decrease until the 15th day after harvesting. To reduce the defects of the mannitol treatment, we investigated combinations of mannitol with glucose or sucrose. Treatment with 25 g L-1 sucrose plus 25 g L-1 mannitol increased the number of open florets and extended vase life more than treatment with 50 g L-1 sucrose alone. However, treatment with glucose plus mannitol did not significantly extend vase life compared with glucose alone. White mannitol powder appeared on the surface of florets and leaves in the combined treatments. Overall, treatment with 30 g L-1 glucose was most effective in improving vase life.
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