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UV-B photoreceptor-mediated protection of the photosynthetic machinery in Chlamydomonas reinhardtii

2016; National Academy of Sciences; Volume: 113; Issue: 51 Linguagem: Inglês

10.1073/pnas.1607695114

1091-6490

Guillaume Allorent, Linnka Lefebvre‐Legendre, Richard Chappuis, Marcel Kuntz, Thuy B. Truong, Krishna Niyogi, Roman Ulm, Michel Goldschmidt‐Clermont,

Algal biology and biofuel production

Significance Life on earth largely depends on the capture of light energy by plants through photosynthesis. Light is essential, but excess light is dangerous. Energy dissipation as heat is a major mechanism induced to protect the photosynthetic machinery. We report that UV-B perception by a specific photoreceptor in the nucleocytosolic compartment leads to protection of the photosynthetic machinery in the chloroplast of a green alga. The underlying mechanism is markedly different from the response to high light. UV-B photoreceptor-mediated signaling activates a safety valve, allowing the release of the excess energy as heat, helping the algae to cope with too much light energy.