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首页> 外文期刊>Botanica Marina >Polyphosphate and siliceous granules in the macroscopic gametophytes of the red alga Porphyra purpurea (Bangiophyceae, Rhodophyta)
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Polyphosphate and siliceous granules in the macroscopic gametophytes of the red alga Porphyra purpurea (Bangiophyceae, Rhodophyta)

机译：红藻紫菜（Bangiophyceae，Rhodophyta）宏观配子体中的多磷酸盐和硅质颗粒

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摘要

Phosphorylated fractions in tissues of starved and fresh plants of Porphyra purpurea, a representative of the Bangiophyceae, were analyzed over a 48 h incubation period in pulseenriched seawater (15 muM phosphorus and 25 muM nitrogen). Compared to Chondrus crispus, a representative of the structurally and reproductively more complex Florideophyceae, P. purpurea takes up phosphorus much more actively, with a higher turnover rate, in which the orthophosphate fraction is predominant and acidsoluble and acidinsoluble polyphosphates are less significant as storage pools. Presence of cytoplasmic acidinsoluble polyphosphate granules was confirmed by transmission electron microscopy and energy dispersive Xray microanalysis. The granules in P. purpurea were much smaller (20-110 nm in diameter) than those in C. crispus (around 1 mum, but some larger than 2 mum). Larger granules (290-310 nm) were observed in P. purpurea. They were more uniformly electronopaque, without the reticulated/globular appearance of typical polyphosphate granules. Energy dispersive Xray microanalysis demonstrated they were siliceous granules. To our knowledge, this is the first report in algae of such structures whose occurrence and metabolic role remain enigmatic.
机译：在富脉冲海水（15μM的磷和25μM的氮）中孵育48小时后，对饥饿的紫菜（Porphyra purpurea）的饥饿和新鲜植物组织中的磷酸化级分进行了分析。与在结构上和繁殖上更复杂的佛罗里达藻科的代表软骨猪笼草相比，紫杉对磷的吸收更为活跃，具有较高的周转率，其中正磷酸盐级分占主导地位，酸溶性和酸不溶性多磷酸盐作为储藏池的意义不大。 。细胞质酸不溶性多磷酸盐颗粒的存在通过透射电子显微镜和能量分散X射线显微分析得到证实。紫霞菌中的颗粒（直径约20-110 nm）比脆皮梭菌中的颗粒小得多（约1微米，但有些大于2微米）。在紫杉中观察到较大的颗粒（290-310 nm）。它们具有更均匀的电子不透性，没有典型的多磷酸盐颗粒的网状/球状外观。能量色散X射线微分析表明它们是硅质颗粒。据我们所知，这是藻类中这种结构的首次报道，这种结构的发生和代谢作用仍然是令人迷惑的。

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