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  • Crassulacean acid metabolism  (4)
  • Springer  (4)
  • American Geophysical Union (AGU)
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  • Springer  (4)
  • American Geophysical Union (AGU)
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  • 1
    Electronic Resource
    Electronic Resource
    Light-dependent net CO-evolution by C3 and C4 plants (1980)
    Springer
    Planta 149 (1980), S. 59-63 
    Details
    ISSN: 1432-2048
    Keywords: Carbon monoxide ; Crassulacean acid metabolism ; Photosynthesis (C3, C4) ; Photorespiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Light-dependent CO-evolution by the green leaves of C3 and C4 plants depends on the CO2/O2 ratio in the ambient atmosphere. This and other physiological responses suggest that CO-evolution is a byproduct of photorespiration. At CO2/O2 ratios up to 10-3, the ratio of CO evolved: CO2 fixed in photosynthesis is significantly higher in C3 than in C4 plants. This discrepancy disappears when a correction is made for the CO2-concentrating mechanism in C4 photosynthesis, by which CO2-concentration at the site of ribulose-bis-phosphate carboxylase/oxygenase in the bundle sheaths is raised significantly as compared to the ambient atmosphere. Since the oxygenase function of this enzyme is responsible for glycolate synthesis, i.e., the substrate of photorespiration, this result seems to support the conclusion that CO-evolution is a consequence of photorespiration. CO-evolution may turn out to be a useful and rather straightforward indicator for photorespiration in ecophysiological studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386228
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  • 2
    Electronic Resource
    Electronic Resource
    Circadian rhythms inKalanchoë: the pathway of14CO2 fixation during prolonged light (1984)
    Springer
    Planta 161 (1984), S. 71-80 
    Details
    ISSN: 1432-2048
    Keywords: Crassulacean acid metabolism ; Carbon dioxide fixation ; Circadian rhythm ; Kalanchoë
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 14CO2 was applied repeatedly at 3- to 6-h intervals toKalanchoë daigremontiana leaves during continuous light of differing irradiances. The circadian rhythm in net CO2 uptake in gasexchange measurements and its disappearance at high irradiances was confirmed by oscillating rates of14CO2 incorporation. At 10–30 W m-2 a markedly circadian oscillation in the14CO2-uptake rate was measured; with increasing energy fluence rate the oscillation levelled off at a constant high uptake rate. The labelling patterns obtained during the 10 min of14CO2 fixation indicated that the rhythm of CO2 exchange is the consequence of a rhythmic behaviour in the C4 pathway of CO2 fixation. During the mininum of14CO2 uptake no C4 products were labelled; however, substantial amounts of label were transferred to C4 products during the peaks of14CO2 uptake. Metabolism of C3 and C4 products was also studied in pulsechase experiments at different points of the circadian cycle. In bright light (100 W m-2), when the14CO2 uptake was constantly high, the transfer of label into C4 products (malic acid) was high in spite of the fact that the malate pool is known to be reduced to a permanently low level under these conditions. This led us to the conclusion that it is not the capacity of the phosphoenolpyruvatecarboxylase-mediated CO2 fixation but rather the storage of malic acid in the vacuole that is disturbed under bright-light conditions when the circadian oscillation levelled off.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00951462
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on carbon flow in Crassulacean acid metabolism during the initial light period (1984)
    Springer
    Planta 160 (1984), S. 121-128 
    Details
    ISSN: 1432-2048
    Keywords: Carbon flow ; Crassulacean acid metabolism ; Kalanchoë ; Light and CAM ; Sedum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the Crassulacean acid metabolism (CAM) plants Kalanchoë tubiflora and Sedum morganianum a shift in the pathways occurs by which external CO2 enters the metabolism during the initial light period (phase II of the diurnal CAM cycle). At the beginning of phase II, CO2 is fixed mainly by the C4 pathway; during late phase II, however, it is fixed mainly via the C3 pathway. The C3 pathway contributes to the phosphoenolpyruvate-carboxylase-mediated CO2 fixation by the provision of three-carbon skeletons. Since the shift in the carbon-flow pathway is delayed after a CO2-free night when malic-acid accumulation in the vacuoles is prevented, it is very likely that the amount of malic acid in the vacuole is integrated in the mechanism which controls CAM during the initial light period. A light-on signal at the beginning of phase II is not required to bring about the shifts in the carbon-flow pathways, as is shown by the reaction of plants to a prolonged dark period. A model of carbon flow during phase II is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392860
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  • 4
    Electronic Resource
    Electronic Resource
    Stimulation of H+transport activity of vacuolar H+ATPase by activation of H+PPase in Kalanchoë blossfeldiana (1997)
    Springer
    Biologia plantarum 39 (1997), S. 169-177 
    Details
    ISSN: 1573-8264
    Keywords: Crassulacean acid metabolism ; photoperiodism ; proton transport ; tonoplast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Kalanchoë blossfeldiana cv. Tom Thumb the initial rate of ATP-dependent H+-transport into tonoplast vesicles was stimulated up to three times if the H+-ATPase (EC 3.6.1.3) was energized a few minutes after pre-energization of the H+-PPase (EC 3.6.1.1). H+-PPase-activated ATP-dependent H+-transport was observed in plants of K. blossfeldiana cultivated in short day (SD) or long day (LD) conditions expressing different degrees of crassulacean acid metabolism (CAM). However, based on the higher activity and protein amount of H+-PPase and H+-ATPase present in the vacuolar membrane of SD plants the maximum H+-transport activity in the stimulated mode of the H+-ATPase was significantly higher in tonoplast vesicles of SD plants than of LD plants. Hence, a co-ordinated action of the H+-PPase and H+-ATPase at the tonoplast of Kalanchoë could allow a higher transport capacity at the vacuolar membrane when plants perform high CAM. Immunoprecipitation experiments with an antiserum raised against the A-subunit of the vacuolar H+-ATPase of Mesembryanthemum crystallinum L. showed that in SD and LD plants of K. blossfeldiana the H+-PPase was co-precipitated with the vacuolar H+-ATPase holoenzyme. The co-percipitation of the two transport proteins indicates a close structural localization of the H+-PPase and the A-subunit of the vacuolar H+-ATPase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000372315936
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