Artículo
A look into the invisible: Ultraviolet-B sensitivity in an insect (Caliothrips phaseoli) revealed through a behavioural action spectrum
Fecha de publicación:
21/02/2010
Editorial:
The Royal Society
Revista:
Proceedings of the Royal Society of London. Series B: Biological Sciences
ISSN:
0962-8452
e-ISSN:
1471-2954
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Caliothrips phaseoli, a phytophagous insect, detects and responds to solar ultraviolet-B radiation (UV-B; λ ≤ 315 nm) under field conditions. A highly specific mechanism must be present in the thrips visual system in order to detect this narrow band of solar radiation, which is at least 30 times less abundant than the UV-A (315-400 nm), to which many insects are sensitive. We constructed an action spectrum of thrips responses to light by studying their behavioural reactions to monochromatic irradiation under confinement conditions. Thrips were maximally sensitive to wavelengths between 290 and 330 nm; human-visible wavelengths (λ ≥ 400 nm) failed to elicit any response. All but six ommatidia of the thrips compound eye were highly fluorescent when exposed to UV-A of wavelengths longer than 330 nm. We hypothesized that the fluorescent compound acts as an internal filter, preventing radiation with λ > 330 nm from reaching the photoreceptor cells. Calculations based on the putative filter transmittance and a visual pigment template of λmax =360 nm produced a sensitivity spectrum that was strikingly similar to the action spectrum of UV-induced behavioural response. These results suggest that specific UV-B vision in thrips is achieved by a standard UV-A photoreceptor and a sharp cut-off internal filter that blocks longer UV wavelengths in the majority of the ommatidia.
Palabras clave:
Insect Behaviour
,
Insect Vision
,
Uv-B
,
Herbivory
,
Thrips
Archivos asociados
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Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IFEVA)
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Citación
Mazza, Carlos Alberto; Izaguirre, Miriam Mercedes; Curiale, Carlos Javier; Ballare, Carlos Luis; A look into the invisible: Ultraviolet-B sensitivity in an insect (Caliothrips phaseoli) revealed through a behavioural action spectrum; The Royal Society; Proceedings of the Royal Society of London. Series B: Biological Sciences; 277; 1680; 21-2-2010; 367-373
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