Photoautotrophic growth of Noctiluca scintillans with the endosymbiont Pedinomonas noctilucae
Photoautotrophic growth of Noctiluca scintillans with the endosymbiont Pedinomonas noctilucae
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DOI：
10.3800/pbr.1.97
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发表时间：
2006-05
影响因子：
0.6
通讯作者：
H. Saito;K. Furuya;T. Lirdwitayaprasit
中科院分区：
文献类型：
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作者：
H. Saito;K. Furuya;T. Lirdwitayaprasit
用Clark型氧电极研究了菲律宾马尼拉湾一种异养甲藻Noctiluca noctiluca的光合作用和呼吸作用。从泰国湾内分离的培养物有两种类型：一种需要外部供应杜氏藻作为食物（摄食菌株），另一种不需要（非摄食菌株）。不取食的菌株世代以光合自养方式生长，但它们也以D.第三部分为兼性摄食。总光合速率在两种类型中处于相同水平，但净光合速率在非摄食菌株中显著高于摄食菌株。这种差异是由于高呼吸活性的喂养菌株。这与马尼拉湾自然种群中的观察结果一致，在那里，没有食物液泡的细胞的净光合作用显著高于有食物液泡的细胞。光合作用与光照的关系表现为低的光饱和强度和无或弱的光抑制，表明其对较宽范围的光强度有有效的利用。P.acetylucae可能保证了有机质的供应给宿主，并促进了N.在粮食短缺期间的埃塞俄比亚人。
Photosynthesis and respiration of a heterotrophic dinoflagellate Noctiluca scintillans that contained Pedi- nomonas noctilucae as an endosymbiont, were examined on cultures and natural populations in Manila Bay, Philip- pines, 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, indicat- ing 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 photo- synthesis was significantly higher in cells lacking food vacuoles than those with food vacuoles. The relationship of pho- tosynthesis 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.