Flavin type action spectrum of nitrate utilization by Monoraphidium braunii

The light-dependent utilization of nitrate by the green alga Monoraphidium braunii, coming from nocturnal dark periods, shows an action spectrum of flavin type with two main bands: one in the blue, peaking at 450 and 480 nm, and the other in the near-UV region with a maximum at 365 nm. Other results...

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Bibliographic Details
Published inPhotochemistry and photobiology Vol. 51; no. 6; pp. 689 - 692
Main Authors Quinones, M.A, Aparicio, P.J
Format Journal Article
LanguageEnglish
Published United States 01.06.1990
Subjects
algae and seaweeds
biosynthesis
flavins
light
nitrate reductase
nitrates
photoactivation
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Summary:The light-dependent utilization of nitrate by the green alga Monoraphidium braunii, coming from nocturnal dark periods, shows an action spectrum of flavin type with two main bands: one in the blue, peaking at 450 and 480 nm, and the other in the near-UV region with a maximum at 365 nm. Other results indicate that cells growing on nitrate as the only nitrogen source resynthesize nitrate reductase daily, which implies the nocturnal loss of this enzyme. The biosynthesis of nitrate reductase at the beginning of the light periods can proceed under red light. In addition, blue or near-UV light is required for the activation of the previously formed nitrate reductase.
ISSN:0031-8655
1751-1097
DOI:10.1111/php.1990.51.6.689