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  • Phytochrome  (6)
  • Springer  (6)
  • American Chemical Society
  • 2020-2023
  • 2000-2004
  • 1980-1984  (2)
  • 1975-1979  (4)
  • 1970-1974
  • 2003
  • 1981  (2)
  • 1978  (4)
  • 1971
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Schlagwörter
Verlag/Herausgeber
  • Springer  (6)
  • American Chemical Society
Erscheinungszeitraum
  • 2020-2023
  • 2000-2004
  • 1980-1984  (2)
  • 1975-1979  (4)
  • 1970-1974
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Light requirement, phytochrome and photoperiodic induction of flowering of Pharbitis nil Chois (1978)
    Springer
    Planta 141 (1978), S. 1-7 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Flowering ; Pharbitis ; Photomorphogenesis ; Photoperiodic induction ; Phytochrome
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract For dark-grown seedlings of Pharbitis nil capacity to flower in response to a single inductive dark period was established by 24 h white, far-red (FR) or ruby-red (BCJ) light and by a skeleton photoperiod of 10 min red (R)-24 h dark-10 min R. FR alone was ineffective without a brief terminal (R) irradiation, confirming that the form of phytochrome immediately prior to darkness is a crucial factor for flowering in Pharbitis. The magnitude of the flowering response was significantly greater after 24 h FR or white light (WL) (at 18° C and 27° C) than after two brief skeleton R irradiations, but the increased flowering response was not attributable to photosynthetic CO2 uptake because this could not be detected in seedlings exposed to 24 h WL at 18° C. Photophosphorylation could have contributed to the increased flowering response as photosystem I fluorescence was detectable in plants exposed to FR, BCJ, or WL, but there were large differences between flowering response and photosystem I capacity as indicated by fluorescence. We conclude that phytochrome plays a major role in photoresponses regulating flowering. There was no simple correlation between developmental changes, such as cotyledon expansion and chlorophyll formation during the 24-h irradiation period, and the capacity to flower in response to a following inductive dark period. Changes in plastid ultrastructure were considerable in light from fluorescent lamps and there was complete breakdown of the prolamellar body with or without lamellar stacking at 27 or 18° C, respectively, but plastid reorganization was minimal in FR-irradiated seedlings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00387736
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Light requirement, phytochrome and photoperiodic induction of flowering of Pharbits nil Chois (1978)
    Springer
    Planta 141 (1978), S. 9-14 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Flowering ; Pharbitis ; Photoperiodic induction ; Phytochrome ; Spectrophotometry (phytochrome)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The low chlorophyll content of cotyledons of Pharbitis nil grown for 24 h in far-red light (FR) or at 18° C in white light from fluorescent lamps (WL) allows spectrophotometric measurement of phytochrome in these tissues. The Δ(ΔA) measurements utilize measuring beams at 730/802 nm and an actinic irradiation in excess of 90 s. The constancy of the relationship between phytochrome content and sample thickness confirms that, under these conditions of measurement, a true maximum phytochrome signal was obtained. These techniques have been used to follow changes in the form and amount of phytochrome during an inductive dark period for flowering. Following exposure to 24h WL at 18° C with a terminal 10 min red (R), Pfr was lost rapidly in darkness and approached zero in less than 1 h; during this period there was no change in the total phytochrome signal. Following exposure to 24 h FR with a terminal 10 min R, Pfr approached zero in 3 h, and the total phytochrome signal decreased by about half. The relevance of these changes to photoperiodic time measurement is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00387737
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Light requirement, phytochrome and photoperiodic induction of flowering of Pharbitis nil Chois (1978)
    Springer
    Planta 141 (1978), S. 15-22 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Flowering ; Pharbitis ; Photoperiodic induction ; Phytochrome ; Spectrophotometry (phytochrome)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract During an inductive dark period for flowering, changes in phytochrome have been followed in cotyledons of Pharbitis nil seedlings using a spectrophotometric and a physiological technique. There was agreement between the two techniques, both indicating a rapid lowering of the levels of the far-red-absorbing form of the pigment (Pfr) during the first 30–90 min of darkness. Thus, Pfr could provide the cue which signals the beginning of darkness and the length of the critical dark period was, in some instances, correlated with the time of Pfr disappearance. However, there was no correlation with another indicator of photoperiodic time measurement, the time in darkness at which a brief night interruption becomes inhibitory to flowering. These results imply that the transition from light to darkness is not signalled by the disappearance of Pfr. However, the involvement of other photoreceptors seems unlikely. Thus, some mode of phytochrome action other than a simple Pfr-mediated response may be involved in the light/dark-sensing reactions of photoperiodism
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00387738
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chenopodium ; Far-red ; Photoequilibrium ; Phytochrome ; Stem extension
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00388211
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Absence of fluence rate dependency of phytochrome modulation of stem extension in light-grown Sinapis alba L. (1981)
    Springer
    Planta 151 (1981), S. 497-498 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Cycling rate ; Phytochrome ; Sinapis ; Stem extension
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In background white light, supplementary far-red (λmax 700 nm) is an order of magnitude less effective than supplementary far-red (λmax 739 nm) in the stimulation of stem extension in Sinapis alba. The relationship between phytochrome photoequilibrium and extension rate increase for the two supplementary far-red treatments is, however, very similar. This evidence indicates that phytochrome cycling is not involved in the phytochrome control of stem extension in light-grown Sinapis alba and that the response to supplementary far-red light is not fluence rate (irradiance) dependent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00386545
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Effects of red and far-red light on cell division in the shoot apex ofSilene coeli-rosa L. (1981)
    Springer
    Protoplasma 107 (1981), S. 285-299 
    Details
    ISSN: 1615-6102
    Schlagwort(e): Cell cycle ; DNA ; Flower initiation ; Phytochrome ; Shoot apex ; Silene
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary 28-day-old plant ofSilene coeli-rosa were exposed at 1,700 hours to 5 or 10 minutes red light, 5 or 10 minutes far-red light, red followed by far-red, far-red followed by red or maintained in darkness. Measurements of the proportions of cells with the 2 C and 4 C amounts of DNA in the shoot apex of the plants, sampled at 2,000 hours, showed that far-red light promoted an increase in the G2 proportion whereas red light resulted in an increase in the G1 proportion of the cell cycle, relative to the dark controls. Moreover these changes were red, far-red reversible. All light treatments resulted in increases in the mitotic index in the apex compared with the dark controls, suggesting increases in the growth rate. The data implicate phytochrome in a low energy response and suggest that, in the shoot apex, G1 is shortened markedly following exposure to farred light, whilst G2 is shortened the most following exposure to red light. The results are discussed in relation to flower-initiation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01276831
    Standort Signatur Erwartet Verfügbarkeit
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