Abstract
In photosynthesis, plants use energy from sunlight to turn carbon from CO2 in the air into a solid form of carbon that can build the plant’s body. Photosynthesis consists of two portions: the reactions that absorb sunlight energy and another set of reactions called the Calvin-Benson-Bassham (CBB) cycle. When the plant “wakes up” in the morning, after a night of darkness, these two processes do not wake up at the same pace, which can damage the plant cells. However, plant cells prevent this problem by regulating these two processes carefully. To understand how photosynthetic organisms switch from night to day, a type of photosynthetic bacteria called cyanobacteria were used to explore how another pathway, called the oxidative pentose phosphate (OPP) pathway, helps with this dark-to-light transition. Our research found that the OPP pathway can help photosynthesis quickly reactivate when light is available and can prevent cell damage from too much light.
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