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首页> 外文期刊>Phycologia >Effect of prolonged dark incubation on pigments and photosynthesis of the cave-dwelling cyanobacterium Phormidium autumnale (Oscillatoriales, Cyanobacteria)
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Effect of prolonged dark incubation on pigments and photosynthesis of the cave-dwelling cyanobacterium Phormidium autumnale (Oscillatoriales, Cyanobacteria)

机译：长时间黑暗孵育对居住在洞穴中的蓝细菌秋季疫霉（颤藻，蓝细菌）的色素和光合作用的影响

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The effect of prolonged darkness on the photosynthetic apparatus of the cyanobacterium Phormidium autumnale was investigated under nonheterotrophic conditions. The purpose of this study was to better understand the processes that allow this organism to rapidly resume growth after prolonged exposure to darkness, as it is often the case in show caves, where periods of darkness are applied to reduce algal proliferation. Phormidium autumnale was subjected to 4 weeks in the dark; this treatment elicited a large decrease in the cells' photosynthetic capacity (Pmax), while the photosynthetic affinity for photons (α) was affected to a smaller degree. Chlorophyll a and carotenoid contents were approximately constant over the 4 weeks of dark incubation, whereas the amount of phycobilins (phycocyanin, allophycocyanin and phycoerythrin) per cell decreased by 50% between the first and the last week of incubation. The relative abundance of the three phycobilins did not vary throughout the treatment, suggesting that the decrease in the number of phycobilisomes was not paralleled by changes in their relative composition. Upon re-exposure to light, cells promptly resumed photosynthesis and were able to cope with high irradiance up to 1600 μmol photons m−2 s−1. The resilience of the photosynthetic apparatus of P. autumnale in the dark may be one of the features that determine the prevalence of this organism in the cave flora at the expenses of more dark-sensitive photolithotrophs (i.e. organisms whose photosynthetic apparatus is substantially reduced or disassembled in the dark).
机译：在非异养条件下，研究了长时间黑暗对蓝藻拟南芥光合作用装置的影响。这项研究的目的是更好地了解使这种生物体在长时间暴露于黑暗后能够快速恢复生长的过程，就像在秀场洞穴中经常发生的那样，为了避免藻类的繁殖，需要在黑暗中度过一段时间。秋季疫霉菌在黑暗中放置了4周。这种处理引起细胞的光合能力（Pmax）大大降低，而对光子（α）的光合亲和力影响较小。在黑暗培养的4周中，叶绿素a和类胡萝卜素的含量大致保持不变，而在培养的第一周和最后一周之间，每个细胞的藻胆素（藻蓝蛋白，别藻蓝蛋白和藻红蛋白）的数量减少了50％。三种藻胆素的相对丰度在整个处理过程中没有变化，这表明藻胆体数量的减少与它们相对组成的变化并不平行。重新暴露于光后，细胞迅速恢复光合作用，并能够应对高达1600μmol光子m-2 s-1的高辐照度。在黑暗中，秋茄的光合装置的复原力可能是确定该生物在洞穴菌群中流行的特征之一，而代价是对黑敏感性更高的光蚀生物（即光合装置被大大减少或分解的生物）在黑暗中）。

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