A look into the invisible ultraviolet - B sensitivity in an insect [Caliothrips phaseoli] revealed through a behavioural action spectrum

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Caliothrips phaseoli, a phytophagous insect, detects and responds to solar ultraviolet-B radiation [UV-B; lambda less than or equal to 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...

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Detalles Bibliográficos
Autor principal: .
Otros Autores: Mazza, Carlos, Izaguirre, Miriam Mercedes, Curiale, Javier, Ballaré, Carlos Luis
Formato: Artículo
Lenguaje:Inglés
Materias:
INSECT BEHAVIOUR
INSECT VISION
UV-B
BEHAVIORAL RESPONSE
HYPOTHESIS TESTING
PHOTORECEPTION
PHYSIOLOGY
PIGMENT
SOLAR RADIATION
THRIPS
ULTRAVIOLET B RADIATION
VISION
WAVELENGTH
ANIMAL BEHAVIOR
RADIATION DOSE
RADIATION EXPOSURE
RADIATION RESPONSE
SUNLIGHT
ULTRAVIOLET RADIATION
ANIMALS
BEHAVIOR, ANIMAL
DOSE-RESPONSE RELATIONSHIP, RADIATION
HUMANS
INSECTS
RADIATION DOSAGE
VISION, OCULAR
CALIOTHRIPS PHASEOLI
HEXAPODA
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2010Mazza.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a Caliothrips phaseoli, a phytophagous insect, detects and responds to solar ultraviolet-B radiation [UV-B; lambda less than or equal to 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 [lambda greater than or equal to 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 lambda is greater than 330 nm from reaching the photoreceptor cells. Calculations based on the putative filter transmittance and a visual pigment template of lambdamax =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. 
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