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.
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Downs, R.J., Hendricks, S.B., Borthwick, H.A.: Photoreversible control of elongation of Pinto beans and other plants under normal conditions of growth. Bot. Gaz. 118, 199–208 (1957)
Evans, A., Smith, H.: Localisation of phytochrome in etioplasts and its regulation in vitro of GA-levels. Proc. Natl. Acad. Sci. USA 73, 138–142 (1976)
Grill, R.: The influence of chlorophyll on in vivo difference spectra of phytochrome. Planta 108, 185–202 (1972)
Hartmann, K.M.: A general hypothesis to interpret ‘high energy phenomena’ of photomorphogenesis on the basis of phytochrome. Photochem. Photobiol. 5, 349–366 (1966)
Holmes, M.G.: Studies on the ecological significance of phytochrome. Ph.D. Thesis, University of Nottingham, England (1975)
Holmes, M.G., Smith, H.: The function of phytochrome in the natural environment. I. Characterisation of daylight for studies in photomorphogenesis and photoperiodism. Photochem. Photobiol. 25, 533–538 (1977a)
Holmes, M.G., Smith, H.: The function of phytochrome in the natural environment. II. The influence of vegetation canopies on the spectral energy distribution of natural daylight. Photochem. Photobiol. 25, 539–545 (1977b)
Holmes, M.G., Smith, H.: The function of phytochrome in the natural environment. IV. Light quality and plant development. Photochem. Photobiol. 25, 551–557 (1977c)
Hurd, R.G.: The effect of an incandescent supplement on the growth of tomato plants in low light. Ann. Bot. 38, 613–623 (1974)
Kasperbauer, M.J.: Spectral distribution of light in a tobacco canopy and effects of end-of-day light quality on growth and development. Plant Physiol. 47, 775–778 (1971)
Kasperbauer, M.J., Peaslee, D.E.: Morphology and photosynthetic efficiency of tobacco leaves that received end-of-day red or far-red during development. Plant Physiol. 52, 440–442 (1973)
Kendrick, R.E., Frankland, B.: Kinetics of phytochrome decay in Amaranthus seedlings. Planta 82, 317–320 (1968)
MacKinney, G.: Absorption of light by chlorophyll solutions. J. Biol. Chem. 140, 315–322 (1941)
McCree, K.J.: Test of current definitions of photosynthetically active radiation against leaf photosynthesis data. Agric. Meteorol. 10, 443–453 (1972)
Morgan, D.C., Smith, H.: Linear relationship between phytochrome photoequilibrium and growth in plants under simulated natural radiation. Nature 262, 210–212 (1976)
Shropshire, W.: Photoinduced parental control of seed germination and the spectral quality of solar radiation. solar Energy 15, 99–105 (1973)
Smith, H., Holmes, M.G.: The function of phytochrome in the natural environment. III. Measurement and calculation of phytochrome photoequilibrium. Photochem. Photobiol. 25, 547–550 (1977)
Tasker, R., Smith, H.: The function of photochrome in the natural environment. V. Seasonal changes in the radiant energy quality in woodlands. Photochem. Photobiol. 26, 487–491 (1977)
Vince-Prue, D.: Photocontrol of stem elongation in light-grown plants of Fuchsia hybrida. Planta 133, 149–156 (1977)
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Paper 7 in the series “The function of phytochrome in the natural environment” [for paper 6 see McLaren, J.S., Smith, H., Plant, Cell and Environment 1, 61–67, 1978]
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Morgan, D.C., Smith, H. The relationship between phytochrome-photoequilibrium and Development in light grown Chenopodium album L.. Planta 142, 187–193 (1978). https://doi.org/10.1007/BF00388211
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DOI: https://doi.org/10.1007/BF00388211