Quieting a noisy antenna reproduces photosynthetic light-harvesting spectra
Quieting a noisy antenna reproduces photosynthetic light-harvesting spectra
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DOI：
10.1126/science.aba6630
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发表时间：
2020-06-26
期刊：
影响因子：
56.9
通讯作者：
Gabor, Nathaniel M.
中科院分区：
文献类型：
--
作者：
Arp, Trevor B.;Kistner-Morris, Jed;Gabor, Nathaniel M.
光合作用实现了接近统一的光捕获量子效率，但尚不清楚是否存在一种基本组织原则，可以在动态光条件和嘈杂的生理环境中产生强大的光捕获。在这里，我们提出了一个降噪网络模型，该模型将噪声生理条件、功率转换效率以及光合生物的吸收光谱联系起来。利用完全阳光照射的光照条件、经含氧光养生物过滤的光以及在海水下过滤的光，我们得出了高效太阳能转换的最佳吸收特性。我们展示了如何通过最小化激发噪声来调整光捕获天线以最大化功率转换效率，从而为观察到的绿色植物、紫色细菌和绿色硫细菌中吸收的波长依赖性提供统一的理论基础。
Photosynthesis achieves near unity light-harvesting quantum efficiency yet it remains unknown whether there exists a fundamental organizing principle giving rise to robust light harvesting in the presence of dynamic light conditions and noisy physiological environments. Here, we present a noise-canceling network model that relates noisy physiological conditions, power conversion efficiency, and the resulting absorption spectra of photosynthetic organisms. Using light conditions in full solar exposure, light filtered by oxygenic phototrophs, and light filtered under seawater, we derived optimal absorption characteristics for efficient solar power conversion. We show how light-harvesting antennae can be tuned to maximize power conversion efficiency by minimizing excitation noise, thus providing a unified theoretical basis for the observed wavelength dependence of absorption in green plants, purple bacteria, and green sulfur bacteria.