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首页> 外文期刊>Aquatic Biology >Active accumulation of internal DIC pools reduces transport limitation in large colonies of Nostoc pruniforme
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Active accumulation of internal DIC pools reduces transport limitation in large colonies of Nostoc pruniforme

机译：内部DIC池的主动积累减少了Nostoc pruniforme大菌落的运输限制

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ABSTRACT: Nostoc pruniforme is a freshwater cyanobacterium forming large spherical colonies of up to several centimeters in diameter. The size and shape result in low surface area to volume (SA/V) ratios that potentially put severe constraints on resource acquisition. In the present study we have specifically examined how N. pruniforme copes with the acquisition of dissolved inorganic carbon (DIC) for photosynthesis. The results showed that N. pruniforme elevates its functional SA/V considerably by locating the cyanobacterial trichomes primarily in the outer shell, while the inner mucus of polysaccharides contains declining densities of trichomes with increasing colony size. N. pruniforme is a very efficient bicarbonate (HCO3–) user and, in addition, actively accumulates large pools of DIC that can support net photosynthesis for 22 h without a supply of external DIC. Both the efficient HCO3– utilization and the large internal DIC pools greatly reduce N. pruniforme dependence on the immediate availability and species of external DIC. The location of the trichomes in the shell, the HCO3– utilization and the internal DIC pools mean that colony size only has a minor effect on photosynthetic rates as a function of external DIC availability.
机译：摘要：尖锐鼻菜是一种淡水蓝细菌，可形成直径达数厘米的大型球形菌落。尺寸和形状导致表面积/体积（SA / V）比率低，这可能对资源获取造成严重限制。在本研究中，我们专门研究了氮的含量。 pruniforme 应付用于光合作用的溶解无机碳（DIC）的获得。结果显示为N。 pruniforme 通过将蓝细菌毛状体主要定位在外壳中而大大提高了其功能性SA / V，而多糖的内部粘液包含的毛状体密度随着菌落大小的增加而下降。 N。 pruniforme 是非常有效的碳酸氢盐（HCO 3 – ）用户，此外，它积极积累大量的DIC，可以支持净光合作用> 22 h无需外部DIC。有效的HCO 3 – 利用率和大型内部DIC池都大大减少了 N。 pruniforme 依赖于外部DIC的即时可用性和种类。壳中毛状体的位置，HCO 3 – 的利用以及内部DIC池意味着，菌落的大小对光合作用的影响很小，是外部作用的函数DIC可用性。

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