CYTOMORPHOLOGICAL CHARACTERIZATION OF THE PLANKTONIC DIAZOTROPHIC CYANOBACTERIA TRICHODESMIUM SPP FROM THE INDIAN-OCEAN AND CARIBBEAN AND SARGASSO SEAS
CYTOMORPHOLOGICAL CHARACTERIZATION OF THE PLANKTONIC DIAZOTROPHIC CYANOBACTERIA TRICHODESMIUM SPP FROM THE INDIAN-OCEAN AND CARIBBEAN AND SARGASSO SEAS
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DOI：
10.1111/j.0022-3646.1995.00463.x
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发表时间：
1995-06-01
影响因子：
2.9
通讯作者：
BERGMAN, B
中科院分区：
文献类型：
--
作者：
JANSON, S;SIDDIQUI, PJA;BERGMAN, B
在加勒比海、马尾藻海和坦桑尼亚（印度洋）沿海地区采集到了Ehrenberg Trichodesmium。根据细胞尺寸和集落形成等形态计量学特征将标本分为5种：T. tenue Wille、T. erythraeum Ehrenberg、T. thiebautii Gomont、T. hildebrandtii Gomont和T. contortum Wille。此外，还对分类位置不确定的球形菌落Trichodesmium sp.进行了鉴定。利用光镜、扫描电镜和透射电镜对各物种的细胞结构进行了研究。特别注意到液泡和糖原、纤维团簇（gfc）的存在和超微结构排列。结果鉴定出两大类群：1)T. tenue, Trichodesmium sp.具有球形菌落，T. erythraeum具有gfc和或多或少的局部液泡；2)不含gfc的T. thibautii、T. hildebrandtii和T. contortum随机分布。每组内的物种进一步表征了气体囊泡、圆柱形体、涡旋体和一个新的细胞包涵体的尺寸。菌落形成和细胞尺寸的差异与六种菌落中五种的特定超微结构特征有关。这是第一次比较在偏远地区取样的不同形式的木霉菌的超微结构研究，并表明无论取样地点如何，一个物种看起来都是相同的。有些物种以前没有被研究过，可能还有更多的物种有待鉴定和分析。
Trichodesmium Ehrenberg species were collected in the Caribbean Sea, Sargasso Sea, and coastal areas of Tanzania (Indian Ocean). The specimens were divided into five species on the basis of morphometric characters such as cell dimensions and colony formation: T. tenue Wille, T. erythraeum Ehrenberg, T. thiebautii Gomont, T. hildebrandtii Gomont, and T. contortum Wille. In addition, Trichodesmium sp., a spherical colony of uncertain taxonomic position was examined. The cell structure of each species was investigated by means of light, scanning electron, and transmission electron microscopy. Particular attention was paid to the presence and ultrastructural arrangement of gas vacuoles and glycogen, fiber clusters (GFCs). This resulted in identification of two major groups of species: 1) T. tenue, Trichodesmium sp. with spherical-shaped colonies, and T. erythraeum with GFCs and more or less localized gas vacuoles; and 2) T. thiebautii, T. hildebrandtii, and T. contortum lacking GFCs and with gas vacuoles spread at random. The species within each group were further characterized with respect to the dimension of the gas vesicles, cylindrical bodies, scroll bodies, and a new cellular inclusion body. Differences in colony formation and cell dimensions correlated with specific ultrastructural characters in five of the six forms. This is the first ultrastructural study comparing different forms of Trichodesmium sampled at geographically remote areas and shows that one species appears identical regardless of the sampling site. Some of the species had not been investigated earlier, and probably more species are to be identified and analyzed.