Ethylene production of Dendrobium Caesar diploid and tetraploid flower
1999
Apivara Prayuravong (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Horticulture)
Study of the relationship between ethylene production and vase life of Dendrobium Caesar diploid (2N) and tetraploid (4N) found that the vase life of tetraploid inflorescences were longer than diploid inflorescences. Water uptake and increase in fresh weight of tetraploid inflorescences were greater than that of diploid inflorescences while the ethylene production of the diploid inflorescences was more than that of the tetraploid inflorescences. Ethylene production of flower buds was the greatest while there were slight difference in ethylene production of open florets at the middle and lower parts of inflorescences. The rate of ethylene production of both of tetraploid and diploid inflorescences correlated with ACC content. Diploid flowers had greater ACC synthase activity and ACC content than tetraploid flowers. Flowers held in ACC solution produced more ethylene than those held in the distilled water and their vase life became shorter. The holding solution containing AOA reduced ethylene production and increased vase life of both diploid and tetraploid inflorescences but diploid inflorescences responded to AOA more than tetraploid inflorescences.
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