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- W3204940798 abstract "Abstract Pigments homologous to the Green Fluorescent Protein (GFP) have been proposed to fine-tune the internal light microclimate of corals, facilitating photoacclimation of photosynthetic coral symbionts (Symbiodiniaceae) to life in different reef habitats and environmental conditions. However, direct measurements of the in vivo light conditions inside the coral tissue supporting this conclusion are lacking. Here, we quantified the intra-tissue spectral light environment of corals expressing GFP-like proteins from widely different light regimes. We focus on (1) photoconvertible red fluorescent proteins (pcRFPs), thought to enhance photosynthesis in mesophotic habitats via wavelength conversion, and (2) chromoproteins (CPs), which provide photoprotection to the symbionts in shallow water via light absorption. Optical microsensor measurements indicated that both pigment groups strongly alter the coral tissue light environment. Estimates derived from light spectra measured in pcRFP-containing corals showed that fluorescence emission can contribute to >50% of orange-red light available to the photosynthetic symbionts at mesophotic depths. We further show that upregulation of pink CPs in shallow-water corals during bleaching leads to a reduction of orange light by 10-20% compared to low-CP tissue. Thus, screening by CPs has an important role in mitigating the light-enhancing effect of coral tissue scattering during bleaching. Our results provide the first experimental quantification of the importance of GFP-like proteins in fine-tuning the light microclimate of corals during photoacclimation." @default.
- W3204940798 created "2021-10-11" @default.
- W3204940798 creator A5022434150 @default.
- W3204940798 creator A5041416404 @default.
- W3204940798 creator A5052026789 @default.
- W3204940798 creator A5065975558 @default.
- W3204940798 creator A5084563184 @default.
- W3204940798 creator A5087442441 @default.
- W3204940798 date "2021-10-07" @default.
- W3204940798 modified "2023-10-02" @default.
- W3204940798 title "Green fluorescent protein-like pigments optimize the internal light environment in symbiotic reef building corals" @default.
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