Action Spectrum in the Ultraviolet Region for Phototropism of Bryopsis Rhizoids : GROWTH AND DEVELOPMENT : ENVIRONMENTAL AND STRESS RESPONSES
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概要
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The phototropic response of the rhizoid of the marine coenocytic green alga Bryopsis plumosa to ultraviolet light (250-350 nm) was investigated. The rhizoid exhibited negative bending that was due to bulging upon absorption of light in the UV region, as well as in the visible region, of the spectrum. The negative bending might not be a result of the inhibition of growth on the irradiated side of the apical hemisphere by UV irradiation because growth inhibition was observed after bending had reached a maximum within one to two hours. The action spectrum obtained from fluence rate-response curves had a pronounced peak at 260 nm and a small peak at 310 nm. The quantum effectiveness at 260 nm was about five times that in the visible region. Phenylacetic acid (PAA), a potent inhibitor of flavin photoreactions, inhibited the phototropic response to both UV light and blue light without any obvious effect on tip growth. The inhibition of the phototropic response to blue light by PAA was partially overcome by rinsing the alga with riboflavin-containing medium, which result suggests the involvement of flavins in the photo-tropism of Bryopsis rhizoids.
- 日本植物生理学会の論文
著者
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Iseki Mineo
Department Of Biology University Of Shizuoka
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Wada Shunji
Biology Laboratory Kyoritsu Women's University
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Wada Shunji
Biological Inslitute Faculty Of Science Tohoku University
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