Effects of shading and temperature on the growth and flowering of Miltonia [Miltoniopsis]
1999
Matsui, N. (Keisen Jogakuen Junior Coll., Tokyo (Japan)) | Yoneda, K.
This study was carried out to determine suitable light intensity and temperature on the growth and the flowering of mericlone plants of the Colombia type, Miltonia vexillaria. 1. CO2 absorption pattern Miltonia vexillaria showed the C3 type photosynthesis. 2. With an increase of light intensity, the CO2 absorption rate increased but when the leaf temperature exceeded 27 degree C, the CO2 absorption rate decreased markedly, irrespective of light intensity. 3. Without controlling the maximum temperature, the leaf areas of leads and new leads were small and pseudobulb diameter was also small. The mortality of plants increased as the light was intensified. 4. When maximum temperature was kept below 32 degree C and the light intensity was high (50 % shading) of intermediate (68 % shading), the pseudobulbs expanded rapidly, the roots grew long, and the dry matter production was high. 5. Plants failed to flower when the maximum temperature exceeded 32 degree C, but flowered early when they were kept below this temperature. Under low light intensity (87.5 % shading), the plants flowered irregularly and the number of flower stalk per plant was small, whereas under intermediate and high light intensity, the number and diameter of flower stalks increased. The elongation of flower stalk under hight light intensity was inhibited
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