Arthrospira platensis NIES-39 的螺旋形态使其毛状体的纵向运动速度具有温度补偿性

Phycology Pub Date : 2024-02-03 DOI:10.3390/phycology4010006
Hideaki Shiraishi, Mari Sasase, Ayano Sakaida Nakashima
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引用次数: 0

摘要

丝状蓝藻在固体表面滑行的速度通常与温度有很大关系,温度越高,速度越快。以前对这一现象的研究都是利用形态平直的丝状蓝藻进行的。我们研究了 Arthrospira platensis NIES-39 沿其纵轴滑行的速度,以了解这种具有螺旋状毛状体的蓝藻是否也有同样的现象。实验结果表明,在较大的温度范围内,这种蓝藻的速度与温度的关系不大。然而,当我们使用具有直毛状体的突变体检测速度时,它们的速度受到温度的影响很大,这与以前分析过的其他丝状蓝藻一样。这一结果表明,A. platensis毛状体的螺旋状形态为其迁移速度提供了温度补偿,使其能够在不同温度下保持相对恒定的速度。与直毛状突变体相比,野生型毛状体在固体培养基上的迁移速度明显受到抑制。这种生物运动中的温度补偿似乎就是这种抑制作用的一部分。研究还发现,当蓝藻的毛状体非常短(<250 µm)时,其运动速度取决于毛状体的长度;毛状体越短,滑行速度往往越慢。这一结果表明,高效的滑行运动需要构成毛状体的大量细胞的协调作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Helicoid Morphology of Arthrospira platensis NIES-39 Confers Temperature Compensation in the Longitudinal Movement Velocity of Its Trichomes
The velocity of the gliding movement of filamentous cyanobacteria on a solid surface usually has a strong temperature dependency, and the higher the temperature, the faster the speed. Former studies on this phenomenon were conducted using filamentous cyanobacteria with straight morphology. We examined the velocity of the gliding movement of Arthrospira platensis NIES-39 along its longitudinal axis to see if the same was true for this cyanobacterium with helicoid trichomes. Experimental results showed little temperature dependency in the velocity in a wide temperature range in this cyanobacterium. However, when we examined the velocity using mutants with straight trichomes, their velocity was strongly affected by temperature, like other formerly analyzed filamentous cyanobacteria. This result indicates that the helicoid morphology of A. platensis trichomes confers temperature compensation to their migration velocity, enabling them to keep a relatively constant velocity under various temperatures. Migration of wild-type trichomes is considerably suppressed compared to the straight-trichome mutants on solid media. The temperature compensation in the locomotion of this organism appears to be established as part of such a suppression. It was also found that the velocity of this cyanobacterium depended on the trichome length when they were atypically short (<250 µm); the shorter the trichomes, the slower the gliding movement tended to be. This result indicates that the coordinated action of a high number of cells constituting the trichome is required for efficient gliding movement.
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