MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, United States.
Department of Plant Biology, Michigan State University, East Lansing, United States.
Elife. 2021 Dec 22;10:e67565. doi: 10.7554/eLife.67565.
In algae, it is well established that the pyrenoid, a component of the carbon-concentrating mechanism (CCM), is essential for efficient photosynthesis at low CO. However, the signal that triggers the formation of the pyrenoid has remained elusive. Here, we show that, in , the pyrenoid is strongly induced by hyperoxia, even at high CO or bicarbonate levels. These results suggest that the pyrenoid can be induced by a common product of photosynthesis specific to low CO or hyperoxia. Consistent with this view, the photorespiratory by-product, HO, induced the pyrenoid, suggesting that it acts as a signal. Finally, we show evidence for linkages between genetic variations in hyperoxia tolerance, HO signaling, and pyrenoid morphologies.
在藻类中，已经确定，淀粉核是碳浓缩机制 (CCM) 的一个组成部分，对于在低 CO 下进行高效光合作用至关重要。然而，触发淀粉核形成的信号一直难以捉摸。在这里，我们表明，在 中，即使在高 CO 或碳酸氢盐水平下，超氧也会强烈诱导淀粉核的形成。这些结果表明，淀粉核可以被特定于低 CO 或超氧的光合作用的常见产物诱导。与这一观点一致，光呼吸副产物 HO 诱导淀粉核形成，表明其作为信号发挥作用。最后，我们提供了证据表明，超氧耐受的遗传变异、HO 信号和淀粉核形态之间存在联系。
