Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 114, Issue 34, Pages 9206-9211Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1704462114
Keywords
chloroplast movement; dark reversion; photoreceptor; thermal reversion; thermosensor
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Funding
- Japan Society for the Promotion of Science (JSPS) [KAKENHI 26840088]
- Exploratory Research for Advanced Technology (ERATO) from the Japan Science and Technology Agency (JST) (Numata Organelle Reaction Cluster) [JPMJER 1602]
- Plant Transgenic Design Initiative (PTraD) of University of Tsukuba
- Center of Excellence (UU-COE)
- Creative Department of Innovation (CDI) of Utsunomiya University
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Living organisms detect changes in temperature using thermosensory molecules. However, these molecules and/or their mechanisms for sensing temperature differ among organisms. To identify thermosensory molecules in plants, we investigated chloroplast positioning in response to temperature changes and identified a blue-light photoreceptor, phototropin, that is an essential regulator of chloroplast positioning. Based on the biochemical properties of phototropin during the cellular response to light and temperature changes, we found that phototropin perceives temperature based on the temperature-dependent lifetime of the photoactivated chromophore. Our findings indicate that phototropin perceives both blue light and temperature and uses this information to arrange the chloroplasts for optimal photosynthesis. Because the photoactivated chromophore of many photoreceptors has a temperature-dependent lifetime, a similar temperature-sensing mechanism likely exists in other organisms. Thus, photoreceptors may have the potential to function as thermoreceptors.
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