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A quantitative cytochemical method for phosphofructokinase in plant tissues.

P B Gahan, L M Bellani, M A Rana

    Histochemistry
    |January 1, 1983
    PubMed
    Summary

    A new quantitative cytochemical method effectively measures phosphofructokinase in plant tissues. This enzyme can indicate glycolytic activity, with high phosphoenolpyruvate levels not limiting the process in living cells.

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    Area of Science:

    • Biochemistry
    • Plant Physiology
    • Enzymology

    Background:

    • Glycolysis is a fundamental metabolic pathway in plant cells.
    • Phosphofructokinase (PFK) is a key regulatory enzyme in glycolysis.
    • Understanding glycolytic flux in plants is crucial for various physiological processes.

    Purpose of the Study:

    • To develop and apply a quantitative cytochemical method for demonstrating phosphofructokinase activity in plant tissues.
    • To evaluate PFK as a reliable indicator of glycolytic activity in plants.
    • To investigate the potential rate-limiting role of endogenous phosphoenolpyruvate (PEP) concentrations in plant glycolysis.

    Main Methods:

    • Quantitative cytochemistry was employed for enzyme demonstration.
    • The method was applied to diverse plant tissue types.

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  • Enzyme activity was measured and correlated with glycolytic flux.

    • Main Results:

    • The quantitative cytochemical method for phosphofructokinase was successfully established and applied across various plant tissues.
    • PFK activity demonstrated a strong correlation with glycolytic activity in plant cells.
    • Very high endogenous phosphoenolpyruvate concentrations were found not to be rate-limiting for glycolysis in vivo.

    Conclusions:

    • The developed quantitative cytochemical method is suitable for assessing phosphofructokinase activity in plant tissues.
    • Phosphofructokinase serves as a valuable indicator of glycolytic activity in plant cells.
    • High endogenous PEP levels do not appear to restrict glycolytic flux in living plant cells.