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Maize mitochondria synthesize organ-specific polypeptides.

K J Newton, V Walbot

    Proceedings of the National Academy of Sciences of the United States of America
    |October 1, 1985
    PubMed
    Summary

    Mitochondria in maize exhibit organ-specific protein differences, with some changes due to organelle synthesis. A specific 13-kDa polypeptide is consistently produced in Texas male-sterile cytoplasm maize.

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    Molecular analysis of the inheritance and stability of the mitochondrial genome of an inbred line of maize.

    TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·2013

    Area of Science:

    • Plant biology
    • Mitochondrial genetics
    • Biochemistry

    Background:

    • Mitochondria play crucial roles in plant cellular energy production and metabolism.
    • Understanding organelle-specific protein composition is key to deciphering plant development and stress responses.

    Purpose of the Study:

    • To investigate quantitative and qualitative organ-specific differences in maize mitochondrial protein composition.
    • To identify organelle-synthesized polypeptides and their developmental regulation.

    Main Methods:

    • Isolation and labeling of mitochondria from different maize organs.
    • Analysis of mitochondrial protein synthesis patterns.
    • Investigation of specific polypeptide expression in Texas male-sterile cytoplasm.

    Main Results:

    • Significant organ-specific variations in total mitochondrial protein were observed.
    • Mitochondrial protein synthesis contributes to some of these organ-specific differences.
    • Developmental stage-specific mitochondrial polypeptides were identified in developing and germinating kernel scutella.
    • A 13-kDa polypeptide from Texas male-sterile cytoplasm mitochondria showed constitutive expression across organs.
    • Methomyl inhibited protein synthesis in mitochondria from Texas male-sterile plants.

    Conclusions:

    • Maize mitochondria display complex organ-specific protein profiles influenced by organelle synthesis.
    • The 13-kDa polypeptide is a stable marker in Texas male-sterile cytoplasm mitochondria.
    • Methomyl's inhibitory effect on mitochondrial protein synthesis highlights its impact on male-sterile plants.

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