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  • Natural radiation  (1)
  • Photoequilibrium  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The relationship between phytochrome-photoequilibrium and Development in light grown Chenopodium album L. (1978)
    Springer
    Planta 142 (1978), S. 187-193 
    Details
    ISSN: 1432-2048
    Keywords: Chenopodium ; Far-red ; Photoequilibrium ; Phytochrome ; Stem extension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chenopodium album seedlings were grown in light environments in which supplementary far-red light was mixed with white fluorescent light during various parts of the photoperiod. Both the logarithmic rate constant of stem extension and the leaf dry weight: stem dry weight ratio were linearly related to estimated phytochrome photoequilibrium (ϕ) in each treatment regime. These data are taken to be indicative of a functional link between phytochrome and development in the green plant. A layer of chlorophyllous tissue only affected the linearity between calculated ϕ and the logarithmic stem extension rate at high chlorophyll concentrations, whilst even low concentrations-equivalent to the levels found in stem tissue-caused a significant shift in measured ϕ. End-of-day supplementary far-red (FR) light induced between 0–35 per cent of the response elicited by all-day supplementary FR, whilst daytime supplementary FR (with a white fluorescent light end-of-day treatment) induced approximately 90 per cent. The ecological significance of this difference is discussed with respect to shade detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388211
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  • 2
    Electronic Resource
    Electronic Resource
    A systematic relationship between phytochrome-controlled development and species habitat, for plants grown in simulated natural radiation (1979)
    Springer
    Planta 145 (1979), S. 253-258 
    Details
    ISSN: 1432-2048
    Keywords: Phytochrome ; Development habitat ; Natural radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A survey of the responsiveness of plant species, typical of open and shade habitats, to simulated natural shade-light quality (i.e. white light plus supplementary far-red) has demonstrated a systematic relationship between habitat and certain developmental responses. Supplementary far-red light has a much greater effect on stem extension rate, petiole length, and leaf dry weight: stem dry weight ratio of the open habitat, shade-intolerant species. Far-red effects on leaf chlorophyll content show no such systematic grading. These results are discussed in relation to habitat adaptation. In most cases, the relationship between developmental response and the estimated phytochrome photoequilibrium, which is established by the radiation treatment, is linear. This is taken as an indication of phytochrome involvement in shade perception.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454449
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    Paper (German National Licenses)
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