Physiological and Ecological Studies on the Growth of Dendrobium

本试验旨在阐明石斛属切花种属Ceratobium - phalaenanan生长的生理和生态特性。并对不同栽培品种的生长特性和从出芽到开花的生长周期变化进行了比较。获得的结果概要如下。在冲绳等亚热带气候下，花期被限制在10月左右，受新芽出芽时间的牢牢调控，即茎部成熟度对花期的影响更大。2. 不同品种之间不仅营养生长期存在较大差异，而且与花有关的各种性状也存在较大差异。3. 利用植酮在受控环境下培养，这组石斛被认为是白天对40℃以上高温具有较强抗性的植物。4. 通过光合作用的方式，明确了该组石斛属CAM植物，因为CO_2在夜间固定。5. 花蕾在开花前就出现了脱落现象，受高湿度和温度突变的影响，花蕾产生乙烯的量也受到影响。

This experiment was carried out in order to clarify the physiological and ecological aspects of the growth of Ceratobium - Phalaenanthe group of Dendrobium which is cultivated as cut flowers. It also was done that comparison on the growth characteristics and changing of growth cycle from budding to flowering related with cultivars. The outline of obtained results are as follows.1. Under the subtropical climate such as Okinawa, flowering time is restricted in around October that is firmly regulated by budding time of new sprout which means maturity of shoot is more dominant factor for flowering. 2. There are considerable differences among cultivars not only on the duration of vegetative growth but also on the various characteristics related with flower. 3. As the result of the culture under the controlled environment by using phytotron, this group of Dendrobium is recognized as a plant having strong resistance for high temperature more than 40 C in day time. 4. With the style of photosynthesis, it was clarified that this group of Dendrobium belong to CAM plant because CO_2 was fixed in night time. 5. With the phenomenon of the dropping of flower bud happened before flowering, it was affected by high moisture and a sudden change of temperature, as same as with amount of ethylene produced from flower bud.