Effects of different temperature and medium treatment on growth of Cymbidium sinense Willdenow

• Main Authors: Ya-Wen Shie, 謝雅文
• Other Authors: Hsiu-Jane Huang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/94891085592208253434

碩士 === 國立宜蘭大學 === 園藝學系碩士班 === 100 === Cymbidium ( Cymbidium sinense Willdenow.) is a symodial orchids, composed of leaves, the enlargement of pseudobulbs, the sheath leaves, and hypertrophy of the root, with latent buds in the leaf and sheath leaves and pseudobulbs junction. Observed the cell differentiation and growth situation of the pseudobulbs of bud, the vascular of pseudobulbs growth direction is irregular, and the formation of latent buds next to pseudobulbs. Different parts of the pseudobulbs, the closer the epidermal parts of cells arranged more closely, with chloroplasts and starch grains in the vibrant small-cell; farther away from the place of the epidermal cells also increased, and more storage of water in the death cells. Both sides of the two leaf primordia of the lateral bud meristem, there are gaps between the layers leaves wrapped leaves of the periphery. Observation of the Cymbidium plants, It can be found the growth law of the pseudobulbs, on the mother pseudobulb both sides, the vertical growth of the daughter pseudobulb with the mother pseudobulb, while the bud also with the vertical growth on the daughter pseudobulb both sides. Mature and swollen pseudobulbs (the mother pseudobulb and the daughter pseudobulb), It formation the latent bud on each section, but subject to the apical dominance without bud, flower buds by the most under a leaf where the section down the number of second, the three formed vegetative buds by down the number of the fourth, five generated. Cymbidium ‘Zu Sin’ and ‘Pacific’ cultivated in a greenhouse ( natural environment) and the growth chamber (day / night temperature 25/20℃ and 20/15℃) test; Cymbidium ‘Zu Sin’ and ‘Pacific’ in all temperature treatments, the mother pseudobulb from the end of July to August, gradually shrinking; but bud pseudobulbs gradually increase from July. Under the 25/20 ℃, the largest number of buds number of Cymbidium ‘Pacific’. The two varieties of Cymbidium leaf width of bud better in 20/15 ℃ and the greenhouse; in the greenhouse, the bud length of Cymbidium ‘Pacific’ is the best. Cymbidium ‘Zu Sin’ regardless of the first year or second year, It’s mother pseudobulbs or daughter pseudobulb, and it’s the best of width, thickness, Diameter in order to the cultivation medium bark; buds pseudobulbs width, thickness, Diameter ,bud length and bud leaves wide coconut : bark = 2:1 ( V / V ) as the best; the bud number (20) of a single medium coconut is batter in the first year; coconut : bark = 2:1 ( V / V ) of flower buds length is better, flower buds number ( total 6) of cultivation medium bark is the better ; per media processing of buds number are similar in the second year, in addition to Japanese stone: tree fern = 3: 1 ( V / V ) less; flower buds length, flower buds number ( total 8) with coconut : bark = 2:1 ( V / V ) better.