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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Photosynthesis research
2026
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| Accesso online: | https://pubmed.ncbi.nlm.nih.gov/41504975/ |
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| _version_ | 1868266102688055297 |
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| author | Morelle, Jérôme Bastos, Alexandra Pereira, Luís F Frankenbach, Silja Lavaud, Johann Serôdio, João |
| author_facet | Morelle, Jérôme Bastos, Alexandra Pereira, Luís F Frankenbach, Silja Lavaud, Johann Serôdio, João Morelle, Jérôme Bastos, Alexandra Pereira, Luís F Frankenbach, Silja Lavaud, Johann Serôdio, João |
| collection | PubMed - marine biology |
| contents | Far-red light regulates phototactic behavior of benthic pennate epipelic diatoms under low irradiance. Morelle, Jérôme Bastos, Alexandra Pereira, Luís F Frankenbach, Silja Lavaud, Johann Serôdio, João Diatom-dominated microphytobenthic communities are exposed to steep and dynamic light gradients in intertidal sediments. The vertical migration of epipelic pennate diatoms is a key adaptive trait enabling optimal light acquisition. However, it remains unclear whether these organisms can detect and respond to long-wavelength light, especially because deeper photic layers are enriched in far-red due to attenuation of shorter wavelengths. Here, we investigated the phototactic responses of a natural microphytobenthic biofilm, primarily composed of epipelic pennate diatoms, to long-wavelength light at two low irradiance levels (5 and 20 µmol photons m⁻² s⁻¹), using a custom-built multispectral LED illuminator. Red light (660 and 680 nm) induced a strong upward vertical migration and a high effective quantum yield of photosynthesis. Far-red light (720 and 740 nm) also triggered a significant upward migratory response, although more moderate than red light. In contrast, near-infrared wavelengths (770 and 810 nm) elicited no significant migratory activity, indistinguishable from the dark controls. Phototactic migration was observed even at 5 µmol photons m⁻² s⁻¹, suggesting a high sensitivity to light at intensities potentially below the photosynthetic compensation point. Our results provide evidence that benthic pennate diatoms can behaviorally respond to long-wavelength, low-intensity light. This response, likely mediated by phytochrome-like photoreceptors, suggests the existence of a low-light, long-wavelength sensing mechanism that enables diatoms to detect fine-scale spectral gradients as cues for surface detection and vertical positioning within the sediment matrix. |
| format | Artículo científico |
| id | pubmed_41504975 |
| institution | PubMed |
| language | en |
| publishDate | 2026 |
| publisher | Photosynthesis research |
| record_format | pubmed |
| spellingShingle | Far-red light regulates phototactic behavior of benthic pennate epipelic diatoms under low irradiance. Morelle, Jérôme Bastos, Alexandra Pereira, Luís F Frankenbach, Silja Lavaud, Johann Serôdio, João Far-red light regulates phototactic behavior of benthic pennate epipelic diatoms under low irradiance. Morelle, Jérôme Bastos, Alexandra Pereira, Luís F Frankenbach, Silja Lavaud, Johann Serôdio, João Diatom-dominated microphytobenthic communities are exposed to steep and dynamic light gradients in intertidal sediments. The vertical migration of epipelic pennate diatoms is a key adaptive trait enabling optimal light acquisition. However, it remains unclear whether these organisms can detect and respond to long-wavelength light, especially because deeper photic layers are enriched in far-red due to attenuation of shorter wavelengths. Here, we investigated the phototactic responses of a natural microphytobenthic biofilm, primarily composed of epipelic pennate diatoms, to long-wavelength light at two low irradiance levels (5 and 20 µmol photons m⁻² s⁻¹), using a custom-built multispectral LED illuminator. Red light (660 and 680 nm) induced a strong upward vertical migration and a high effective quantum yield of photosynthesis. Far-red light (720 and 740 nm) also triggered a significant upward migratory response, although more moderate than red light. In contrast, near-infrared wavelengths (770 and 810 nm) elicited no significant migratory activity, indistinguishable from the dark controls. Phototactic migration was observed even at 5 µmol photons m⁻² s⁻¹, suggesting a high sensitivity to light at intensities potentially below the photosynthetic compensation point. Our results provide evidence that benthic pennate diatoms can behaviorally respond to long-wavelength, low-intensity light. This response, likely mediated by phytochrome-like photoreceptors, suggests the existence of a low-light, long-wavelength sensing mechanism that enables diatoms to detect fine-scale spectral gradients as cues for surface detection and vertical positioning within the sediment matrix. |
| title | Far-red light regulates phototactic behavior of benthic pennate epipelic diatoms under low irradiance. |
| url | https://pubmed.ncbi.nlm.nih.gov/41504975/ |