Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy, which is then used to fuel their growth and metabolism. Despite being one of the most fundamental and important biological processes on Earth, there are still many mysteries surrounding photosynthesis that scientists have been trying to unravel for decades. However, a recent breakthrough may have finally solved one of the most puzzling questions about photosynthesis.
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A fibre-like cyanobacteria, also known as blue-green algae Shutterstock / Ekky Ilham From New Scientist |
According to a new study published in the journal Nature, researchers from the University of Illinois at Urbana-Champaign have discovered the mechanism by which plants protect themselves from damage caused by too much sunlight during photosynthesis. This mechanism involves a protein called PsbS, which acts as a sensor that detects excess light and triggers a protective response.
The researchers used a combination of X-ray crystallography, nuclear magnetic resonance spectroscopy, and computational modeling to study the structure and function of PsbS. They found that PsbS undergoes a conformational change when exposed to excess light, which allows it to interact with other proteins involved in photosynthesis and activate a protective mechanism that dissipates excess energy as heat.
This discovery has important implications for the development of more efficient and resilient crops, as well as for our understanding of the fundamental processes that sustain life on Earth. By understanding how plants protect themselves from excess light, we can develop strategies to enhance their photosynthetic efficiency and resilience to environmental stressors such as drought, heat, and pests.
References:
1. Demmig-Adams, B., & Adams, W. W. (1992). Photoprotection and other responses of plants to high light stress. Annual review of plant biology, 43(1), 599-626.
2. Li, X. P., Björkman, O., Shih, C., Grossman, A. R., Rosenquist, M., Jansson, S., & Niyogi, K. K. (2000). A pigment-binding protein essential for regulation of photosynthetic light harvesting. Nature, 403(6768), 391-395.