1989 Fiscal Year Final Research Report Summary
Studies on the nutrition of orchid-fungus associations.
Project/Area Number |
63560019
|
Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
園芸・造園学
|
Research Institution | Hokkaido University |
Principal Investigator |
TSUTSUI Kiyoshi Hokkaido Univ., Fac. Agri., Prof., 農学部, 教授 (90155416)
|
Project Period (FY) |
1988 – 1989
|
Keywords | Orchid / Symbiosis / Nutrition / Plant density / Carbohydrates / Nitrogen / Suitability / Parasitism |
Research Abstract |
In symbiotic cultures of Spiranthes sinensis and Liparis nervosa, ball- milled oat medium was the best so far. The seedling growth was dependent on oat quantity per individual seedling, and was independent of the oat concentrations in media in the range below optimal concentrations. Severe growth retardation which might be the result of increased fungal parasitism, occurred in proportion to oat concentrations over the optimal values which varied according to fungal isolates used. The effective constituents in oats for symbiotic seedlings were major mineral elements, insoluble carbohydrates and organic nitrogen. Organic nitrogen was far more suitable than inorganic one, but an excess amount of it was injurious to the seedlings. All carbohydrates including galactose and galacturonic acid were suitable for fungal growth. However, polysaccharides such as cellulose or inulin were more suitable than mono- or disaccharides for symbiotic seedling growth. Seedlings could not grow on galactose or galacturonic acid, but these sugars were suitable if the seedlings do not directly contact with the sugars. The suitability of pectin and mannitol markedly varied with orchid- fungus combinations. This variation was due to the difference of fungi for pectin, and the difference of orchids for mannitol.
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Research Products
(2 results)