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Related Experiment Videos

Quantitative studies on ferredoxin in greening bean leaves.

B G Haslett, R Cammack, F R Whatley

    The Biochemical Journal
    |November 1, 1973
    PubMed
    Summary

    Researchers developed two methods to measure ferredoxin, an iron-sulphur protein. Ferredoxin synthesis in bean leaves is light-dependent and occurs on cytoplasmic ribosomes, independent of chlorophyll in early stages.

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    Planta·2013

    Area of Science:

    • Plant Physiology
    • Biochemistry
    • Molecular Biology

    Background:

    • Ferredoxin is a crucial iron-sulphur protein involved in electron transport.
    • Understanding ferredoxin development is key to chloroplast biogenesis.

    Purpose of the Study:

    • To describe novel methods for quantifying ferredoxin.
    • To investigate ferredoxin synthesis during etioplast bean leaf greening.

    Main Methods:

    • Electron paramagnetic resonance (e.p.r.) spectroscopy at g=1.96.
    • Chloroplast bioassay using an O(2) electrode to measure ferredoxin-dependent electron transport.

    Main Results:

    • Ferredoxin levels increase linearly with illumination time in etiolated bean leaves.
    • Synthesis is light-dependent, with red light being most effective.
    • Ferredoxin synthesis occurs on cytoplasmic ribosomes and is initially independent of chlorophyll synthesis.

    Conclusions:

    • Ferredoxin synthesis is light-regulated, likely not via phytochrome.
    • A stoichiometric control mechanism exists for chlorophyll and ferredoxin in mature chloroplasts.
    • Ferredoxin is synthesized on cytoplasmic ribosomes.

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