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|標題:||Effect of Transplant Timing on Plantlet Quality ex vitro of Doritaenopsis|
分析相對生長量，顯示朵麗蝶蘭在不同苗齡出瓶後恢復生長勢之能力有顯著差異。在鮮重及乾重方面，皆以60天苗齡瓶苗出瓶後之相對生長量最快。因此根據瓶內二氧化碳、乙烯濃度、根部活性及相對生長量之試驗結果，朵麗蝶蘭Doritaenopsis I-Hsin New Girl 'KH5250'在定瓶後60天，呈現最低老化與逆境反應。|
The studies were to seek optimum timing for ex vitro transplant, effect of plantlet age on the growth of plants which were ex vitro transplanted. Doritaenopsis I-Hsin New Girl 'KH5250'determined content of gas in the flask decreased along with increase of growing days, 120 days after subculture was lowest and the value was 0.6%. There was diurnal rhythm of carbon dioxide content in the flask for every stage. The carbon dioxide content decreased at the start of light period and increased gradually during dark period. Ethylene content in cultural vessels arose with increases of plantlet age. Ethylene content was more ten-fold increase at 90 and 120 days after subculture and the values were both 0.2 ppm. At the same time, plantlets appeared root circling, root senescence, loss of the geotropism, hairy root and coriaceous root. The root senescence and activity down was observed at 90 and 120 days after subculture by the TTC determination way. There was significantly different from restoring force of growing ability at different plantlet age after ex vitro transplant for analysis of relative growth weight. After analyzing fresh weight and dry weight, found the best of growth rate were both 60 days after ex vitro transplanting. According to the carbon dioxide and ethylene content in the flask, root activity, relative growth weight, the lowest aging and adverse circumstance response at 60 days after subculture.
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