Department of Biotechnology, Norwegian University of Science and Technology, Trondheim, Norway.
Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway.
PLoS One. 2019 Jan 9;14(1):e0209920. doi: 10.1371/journal.pone.0209920. eCollection 2019.
Heterokont algae are significant contributors to marine primary productivity. These algae have a photosynthetic machinery that shares many common features with that of Viridiplantae (green algae and land plants). Here we demonstrate, however, that the photosynthetic machinery of heterokont algae responds to light fundamentally differently than that of Viridiplantae. While exposure to high light leads to electron accumulation within the photosynthetic electron transport chain in Viridiplantae, this is not the case in heterokont algae. We use this insight to manipulate the photosynthetic electron transport chain and demonstrate that heterokont algae can dynamically distribute excitation energy between the two types of photosystems. We suggest that the reported electron transport and excitation distribution features are adaptations to the marine light environment.
不等鞭毛藻类是海洋初级生产力的重要贡献者。这些藻类拥有的光合作用机制与维管植物（绿藻和陆地植物）有许多共同特征。然而，我们在此证明，不等鞭毛藻类的光合作用机制对光的响应与维管植物完全不同。在维管植物中，高光会导致光合作用电子传递链中的电子积累，但在不等鞭毛藻类中则不是这样。我们利用这一认识来操纵光合作用电子传递链，并证明不等鞭毛藻类可以在两种类型的光合系统之间动态分配激发能。我们认为，所报道的电子传递和激发分布特征是对海洋光照环境的适应。
