Analysis of light-controlled accumulation of carotenoids in mustard (Sinapis alba L.) seedlings |
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Authors: | S. Frosch H. Mohr |
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Affiliation: | (1) Biologisches Institut II, Universität Freiburg, Schänzlestraße 1, D-7800 Freiburg, Germany |
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Abstract: | Carotenoid accumulation in the cotyledons of the mustard seedling (Sinapis alba L.) is controlled by light. Besides the stimulatory function of phytochrome in carotenogenesis the experiments reveal the significance of chlorophyll accumulation for the accumulation of larger amounts of acrotenoids. A specific blue light effect was not found. The data suggest that light exerts its control over carotenoid biogenesis through two separate mechanisms: A phytochrome regulation of enzyme levels before a postulated pool of free carotenoids, and a regulation by chlorophyll draining the pool by complex-formation.Abbreviations Chl chlorophyll(s) - PChl protochlorophyll(ide) - HIR high irradiance reaction (of phytochrome) - Pfr far-red absorbing, physiologically active form of phytochrome - Pr red absorbing, physiologically inactive form of phytochrome - Pfof total phytochrome, i.e. [Pr]+[Pfr] - [Pfr]/[Pfof], wavelength dependent photoequilibrium of the phytochrome system - red red light - fr far-red light |
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Keywords: | Carotenoids Chlorophylls Light control Phytochrome Plastid development Sinapis |
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