Comparison of Flowering Behavior between Mature and Premature Plants of Phalaenopsis under Different Temperature Conditions.

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The emergence of the flower-stalk and the flowering behavior were compared in two groups of mature and premature plants of Phalaenopsis that had been exposed to two different temperature conditions at 20°C and 25°C for 25 days and 50 days each under natural daylength in the summer season. 1. Over 90% of the mature plants produced flower-stalks between late July and early August more or less simultaneously. The flower-stalks in the premature plants emerged much later, and they tended to be taller under the lower temperature conditions and the longer treatment. 2. In the mature plants, over 80% of the flowers bloomed, and anthesis occurred between early and mid-October. In the premature plants, the shorter the treatment, the fewer the flowers that bloomed with considerable delay. 3. In both mature and premature plants most flower-stalks arose from the fifth nodes of the stems. 4. The number of flowers on mature plants was slightly increase at 20°C than at 25°C, and increased more conspicuously after the 50-day treatment than the 25-day treatment. The premature plants bore fewer flowers than the mature ones. 5. The flower-stalks in the mature plants stretched more at 25°C than at 20°C and after the 25-day treatment than the 50-day treatment. The flower-stalks in the premature plants tended to stretch at 20°C.
日本熱帯農業学会の論文