Characteristics of Crassulacean Acid Metabolism in the Succulent C(4) Dicot, Portulaca oleracea L.

@article{Koch1980CharacteristicsOC,
  title={Characteristics of Crassulacean Acid Metabolism in the Succulent C(4) Dicot, Portulaca oleracea L.},
  author={Karen E. Koch and Robert A. Kennedy},
  journal={Plant physiology},
  year={1980},
  volume={65 2},
  pages={
          193-7
        }
}
Crassulacean acid metabolism (CAM) was investigated in leaves and stems of the succulent C(4) dicot Portulaca oleracea L. Diurnal acid fluctuations, CO(2) gas exchange, and leaf resistance were monitored under various photoperiod and watering regimes. No CAM activity was seen in well watered plants grown under 16-hour days. Under 8-hour days, however, well watered plants showed a CAM-like pattern of acid fluctuation with amplitudes of 102 and 90 microequivalents per gram fresh weight for leaves… 

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References

SHOWING 1-10 OF 35 REFERENCES
Induction of Acid Metabolism in Portulacaria afra.
TLDR
Stressed plants showed only dark CO(2) uptake and dark water loss, nocturnal stomatal opening, and an increased diurnal fluctuation of titratable acidity indicating that the response to stress was reversible.
Pathways of CO2 Fixation in the Cam Plant Kalanchoe daigremontiana. III. Correlation With δ13C Value During Growth and Water Stress
TLDR
Differences in the δ13C value of soluble and insoluble carbon from irrigated and droughted plants assayed at dawn appear to be consistent with the established starch to acid relationships in crassulacean plants.
Seasonal Patterns of Acid Metabolism and Gas Exchange in Opuntia basilaris.
TLDR
The rapid response to a midsummer rainfall emphasizes the importance of plant water potential as a parameter controlling over-all metabolic activity and significantly influenced the efficiency of water use and carbon dioxide assimilation.
CRASSULACEAN ACID METABOLISM UNDER NATURAL TROPICAL CONDITIONS
Summary The content of various metabolic intermediates has been determined in material from several species of succulent plants known to show a Crassulacean acid metabolism, grown under natural
Drought Adaptation in Opuntia basilaris: Significance of Recycling Carbon through Crassulacean Acid Metabolism.
TLDR
The hypothesis is that endogenously produced CO( 2) is retained and recycled through dark CO(2) fixation, organic acid transformations, photosynthesis, and respiration, and permitting increased atmospheric CO(1) assimilation and organic acid synthesis.
Seasonal effects on carbon isotope composition of cactus in a desert environment
IN plants with crassulacean acid metabolism (CAM), CO2 is fixed in the light by ribulose-l,5-bisphosphate carboxylase1,2 and in the dark by phosphoenol pyruvate (PEP) carboxylase2,3. Because these
ENVIRONMENTAL INFLUENCES ON LIGHT AND DARK CO2 FIXATION BY KALANCHOE DAIGREMONTIANA
TLDR
The data obtained suggest that variations in δ13C values in Kalanchoe result from changes in the proportion of light and dark CO2 fixation, which are related to day length, light quality, temperature, drought, and oxygen concentration.
Respiration and Gas Exchange in Stem Tissue of Opuntia basilaris.
Respiration and gas exchange in the light were studied manometrically with tissue slices from stem material of Opuntia basilaris Engelm. and Bigel. Dark respiration rates were greater in young stems
...
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