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  • 1
    Electronic Resource
    Electronic Resource
    The effect of light pretreatments on phytochrome-mediated induction of anthocyanin and of phenylalanine ammonia-lyase (1979)
    Springer
    Planta 146 (1979), S. 369-376 
    Details
    ISSN: 1432-2048
    Keywords: Anthocyanin ; Mode of action of phytochrome ; Phenylalanine ammonia-lyase ; Phytochrome ; Sinapis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Induction by light of phenylalanine ammonia-lyase (PAL; EC 4.3.1.5) and of anthocyanin in cotyledons of the mustard (Sinapis alba L.) seedling is strongly affected by a light pretreatment which operates through phytochrome. If PAL or anthocyanin is induced by a light pulse, the effectiveness of phytochrome (Pfr) is strongly increased by a light pretreatment; however, if the increase of the PAL level or synthesis of anthocyanin is elicited by continuous far-red light (operating via phytochrome in the ‘High Irradiance Response’), effectiveness of light is strongly reduced by the same light pretreatment. This reduction of effectiveness is correlated with a decrease of total phytochrome (Ptot) caused by the light pretreatment. It is argued that the observations are compatible only with the ‘open phytochrome-receptor model’ as suggested by Schäfer (J. Mathem. Biol. 2, 41–56, 1975). The peaks of the time courses of the PAL levels under continous far-red light are located at 48 h after sowing and do not depend on the original level of phytochrome. The decrease of the PAL levels beyond 48 h after sowing takes place independently of phytochrome and of the actual level of PAL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387810
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  • 2
    Electronic Resource
    Electronic Resource
    Pattern formation underlying phytochrome-mediated anthocyanin synthesis in the cotyledons ofSinapis alba L. (1977)
    Springer
    Planta 133 (1977), S. 229-235 
    Details
    ISSN: 1432-2048
    Keywords: Anthocyanin ; Differentiation pattern ; Epidermis ; Sinapis ; Vacuoles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ability to respond to phytochrome (Pfr, the far-red light absorbing from of phytochrome) with anthocyanin synthesis appears first in some marginal regions of the abaxial epidermis of the mustard cotyledons and from there spreads gradually over the entire tissue (transient phase). The pertinent pattern is independent of environmental influences such as light quality and nutritional culture conditions. The competence for Pfr in the epidermal cells, with regard to the initial action of Pfr (concerning anthocyanin synthesis), appears considerably earlier than the ability for actual anthocyanin synthesis. An electron microscopical study of the ultrastructural changes occurring in vacuoles and plastids of the epidermal cells during the transient phase showed that a correlation only exists between the differentiation of central cell vacuoles, originating from the aleurone vacuoles, and the appearance of the ability to accumulate anthocyanin. It is suggested that the formation of a central cell vacuole is a prerequisite for anthocyanin accumulation in the epidermal cells of the mustard seedling cotyledons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380682
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    Paper (German National Licenses)
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