摘要
Photosynthesis and respiration of a heterotrophic dinoflagellate Noctiluca scintillans that contained Pedinomonas noctilucae as an endosymbiont, were examined on cultures and natural populations in Manila Bay, Philippines, using a Clark-type oxygen electrode. The cultures isolated from the inner Gulf of Thailand were of two types: one required external supply of Dunaliella tertiolecta as food (feeding strains) and the other did not (non-feeding strains). The non-feeding strains grew photoautotrophically for generations, but they also fed on D. tertiolecta, indicating phagotrophy was facultative. Gross photosynthesis was at the same level in both types, but net photosynthesis was significantly higher in the non-feeding strains than the feeding ones. The difference was due to high respiration activity in the feeding strains. This was consistent with observations in the natural population of Manila Bay, where net photosynthesis was significantly higher in cells lacking food vacuoles than those with food vacuoles. The relationship of photosynthesis with irradiance was characterized by low intensity of light saturation and absence or weak photoinhibition, showing efficient utilization of a wide range of light intensities. P. noctilucae likely assures a supply of organic matter to the host, and facilitates survival of N. scintillans during shortages of food particles.
摘要译文
光合作用的异养甲藻夜光藻包含Pedinomonas noctilucae作为共生和呼吸，进行了检查对文化和自然种群在马尼拉湾，菲律宾，采用Clark型氧电极。来自泰国的内海湾中分离的培养物两种类型：杜氏藻的一个需要外部供应食品（馈送株）和其他没有（非馈株）。非馈送菌株光自养生长世代，但它们也取食D.藻，表明phagotrophy是兼性。毛光合作用是在这两种类型的相同的水平，但净光合是显著高于非馈送菌株比馈送的。该差异是由于在馈送菌株高呼吸活性。这是在马尼拉湾的人口自然观察结果一致，其中，净光合速率是显著高于细胞缺乏食物空泡比那些食物空泡。光合作用与辐照度的关系的特征在于光饱和和不存在或弱光抑制强度低，示出了广泛的光强度的有效利用。 P. noctilucae容易确保向主机供给的有机物，并促进N的生存在食物颗粒短缺藻。
Haruna Saito[1]; Ken Furuya[1];Thaithaworn Lirdwitayaprasit[1]. Photoautotrophic growth of Noctiluca scintillans with the endosymbiont Pedinomonas noctilucae[J]. Plankton and Benthos Research, 2006,1(2): 97-101