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No Effect of Host Tree Species on the Physiology of the Epiphytic Orchid Bulbophyllum japonicum in a Subtropical Rainforest in Northeastern Taiwan

台灣東北部亞熱帶雨林附生蘭科植物(Bulbophyllum japonicum)之生理無宿主效應

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摘要


本研究於台灣東北部亞熱帶雨林測量附生於三種不同宿主的日本捲瓣(Bulbophyllum japonicum)之葉綠素濃度、景天酸代謝變動以及葉綠素螢光參數。所量的項目在不同宿主的個體間皆無顯著差異,因此雖然這些宿主植物的葉形、樹皮特徵以及幹流水的營養組成有可觀的差異,這差異並未對此附生蘭的生理產生很大的影響。這樣的結果可能反應此生長緩慢、耐陰之蘭科植物其低生長速率以及低營養需求。本研究的發現有助於解釋此附生植物,可能也包括其它許多附生植物,缺宿主專一性的現象。

並列摘要


Chlorophyll concentrations, Crassulacean acid metabolism AM) acid fluctuations, and chlorophyll fluorescence parameters were measured in individuals of the epiphytic orchid Bulbophylum japonicum growing on 3 different host tree species in a subtropical rainforest in northeastern Taiwan. No differences in any of the physiological measures were found. Thus, although the host tree species vary considerably in leaf morphology, bark characteristics, and elemental composition of stem flow water, such differences did not substantially impact the physiology of this epiphytic orchid. These results may reflect the slow growth rates and minimal nutrient requirements of this slow-growing, shade-adapted orchid. The findings of this study help explain the lack of host specificity in this epiphyte and perhaps in many other species.

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