Cyanobacteria can sense different light color by adjusting the components of photosynthetic pigments including chlorophyll a (Chl a), phycoerythrin (PE), and phycocyanin (PC), etc. Filamentous cyanobacteria are the main producer of 2-methylisoborneol (MIB) and many can increase their PE levels so that they are more competitive in subsurface layer where green light is more abundant, and have caused extensive odor problems in drinking water reservoirs. Here, we identified the potential correlation between MIB biosynthesis and ambient light color induced chromatic acclimation (CA) of a MIB-producing Pseudanabaena strain. The results suggest Pseudanabaena regulates the pigment proportion through Type III CA (CA3), by increasing PE abundance and decreasing PC in green light. The biosynthesis of MIB and Chl a share the common precursor, and are positively correlated with statistical significance regardless of light color ($R^2=0.68$; $p<0.001$). Besides, the PE abundance is also positively correlated with Chl a in green light ($R^2=0.57$; $p=0.019$) since PE is the antenna that can only transfer the energy to PC and Chl a. In addition, significantly higher MIB production was observed in green light since more Chl a was synthesized.

蓝藻通过调节叶绿素a（Chl a ）、藻红蛋白（PE）和藻蓝蛋白（PC）等光合色素的成分来感知不同的光色。丝状蓝藻是2-甲基异冰片（MIB）的主要生产者，许多可以增加它们的 PE 水平，使它们在绿光更丰富的地下层更具竞争力，并在饮用水水库中造成广泛的气味问题。在这里，我们确定了 MIB 生物合成与环境光颜色诱导的产生 MIB 的拟南芥菌株的色驯化 (CA) 之间的潜在相关性。结果表明拟南芥通过在绿光下增加 PE 丰度和减少 PC，通过 III 型 CA (CA3) 调节色素比例。MIB 和 Chl a的生物合成共享共同的前体，并且无论光色如何都与统计显着性呈正相关（$R^{\mathrm{2个}}=0.68$;$p<0.001$). 此外，PE丰度也与绿光下的Chl a呈正相关（$R^{\mathrm{2个}}=0.57$;$p=0.019$) 因为 PE 是只能将能量传递给 PC 和 Chl a 的天线。此外，由于合成了更多的 Chl a ，因此在绿光下观察到显着更高的 MIB 产量。