Bryophyllum fedtschenkoi

Nimmo, G.A., Nimmo, H.G., Hamilton, I.D., Fewson, C.A. Wilkins, M.B. (1986). Purification of the phosphorylated night form and dephosphorylated day form of phosphoeno/pyruvate carboxylase from Bryophyllum fedtschenkoi. Biochemical Journal 239, 213-20. 

In order to clarify this question, Warren and Wilkins (1961) supplied " C02 in continuous darkness to leaves of Bryophyllum fedtschenkoi and measured simultaneously total net CO2 exchange. The results of this experiment suggested that it was the " C02 uptake that showed the rhythm. The " C02 fixation maximum... 

Fig. 5.15. Rhythms of CO2 output and " C02 fixation in leaves of Bryophyllum fedtschenkoi under continuous darkness. S o/id/me CO2 output histogram CO2 fixation (after Warren...

Fig. 5.16. The apparent entrainment of CO2 output rhythm by exposing leaves of Bryophyllum fedtschenkoi to 8 8 (a, b), 6 6 (c) and 3 3 h cycles of light (1000 lux/darkness). The illumination programme is indicated by the bar above each graph. Mn, midnight (after...

Fig. 5.17 a and b. The effect of interruption of continuous darkness by short light treatments on the CO2 output rhythm in Bryophyllum fedtschenkoi. a Light treatment during the trough of CO 2 output curve, b Light treatment during the peak of CO 2 output curve. 

The CO2 output rhythm of Bryophyllum fedtschenkoi can be inhibited by interrupting continuous dark by bright light or high temperature (Wilkins, 1959, 1960,1962 a, b). After light or temperature treatment, restoration of the rhythmic... 

Such speculation presumes, however, that the rhythm is a general feature of CAM plants. Despite the fact that Kalanchoe blossfeldiana, K, daigremontiana, and Bryophyllum fedtschenkoi are typical CAM plants, only a few species have... 

Jones (1975) using Bryophyllum fedtschenkoi also found lower resistances with young leaves. The young leaves which do not show CAM as evidenced by a lack of organic acid fluctuation and dark CO2 uptake, showed low stomatal resistance... 

Jones, M.B. The effect of leaf age on leaf resistance and CO2 exchange of the CAM plant Bryophyllum fedtschenkoi. Planta 123,91-96 (1975)... 

Jones, M. B., Mansfield,T. A. A circadian rhythm in the level of carbon dioxide compensation in Bryophyllum fedtschenkoi with zero values during the transient. Planta 103, 134-146 (1972)... 

Wilkins,M.B. (ed.), pp. 647-671. London McGraw-Hill 1969 Wilkinson, M.J., Smith, H. Properties of phosphoenol pyruvate carboxylase from Bryophyllum fedtschenkoi leaves and fluctuation in carboxylase activity during endogenous rhythms of carbon dioxide output. Plant Sci. Lett. 6, 319-324 (1976)... 

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