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Blue-/Green-Light-Responsive Cyanobacteriochromes Are Cell Shade Sensors in Red-Light Replete Niches

机译:蓝/绿光响应性蓝细菌是红光充足壁ches中的细胞阴影传感器

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摘要

Cyanobacteriochrome (CBCRs) photoreceptors show various photochemical properties, but their ecophysiological functions remain elusive. Here, we report that the blue/green CBCRs SesA/B/C can serve as physiological sensors of cell density. Because cyanobacterial cells show lower transmittance of blue light than green light, higher cell density gives more green-light-enriched irradiance to cells. The cell-density-dependent suppression of cell aggregation under blue-/green-mixed light and white light conditions support this idea. Such a sensing mechanism may provide information about the cell position in cyanobacterial mats in hot springs, the natural habitat of . This cell-position-dependent SesA/B/C-mediated regulation of cellular sessility (aggregation) might be ecophysiologically essential for the reorganization and growth of phototrophic mats. We also report that the green-light-induced dispersion of cell aggregates requires red-light-driven photosynthesis. Blue/green CBCRs might work as shade detectors in a different niche than red/far-red phytochromes, which may be why CBCRs have evolved in cyanobacteria.
机译:蓝细菌色素(CBCRs)感光体具有多种光化学特性,但其生理生理功能仍然难以捉摸。在这里,我们报告蓝色/绿色CBCRs SesA / B / C可以用作细胞密度的生理传感器。因为蓝细菌细胞显示的蓝光透射率低于绿色光,所以较高的细胞密度为细胞提供了更多的绿光富集辐照度。在蓝/绿混合光和白光条件下对细胞聚集的细胞密度依赖性抑制支持了这一想法。这样的感测机制可以提供关于温泉的蓝藻垫中的细胞位置的信息,温泉是温泉的天然栖息地。这种依赖于细胞位置的SesA / B / C介导的细胞固着性(聚集)调节对于光养垫的重组和生长可能在生态生理上必不可少。我们还报告说,绿光诱导的细胞聚集体分散需要红光驱动的光合作用。蓝/绿CBCR可能在与红/远红植物色素不同的领域中充当阴影检测器,这可能就是CBCR在蓝细菌中进化的原因。

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