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Membrane transformations in aging potato tuber slices.

P A Castelfranco1, W J Tang, M L Bolar

  • 1Department of Botany, University of California, Davis, California 95616.

Plant Physiology
|December 1, 1971
PubMed
Summary
This summary is machine-generated.

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Potato tuber aging alters how radioactive choline is incorporated into membrane phospholipids. Aging increases radioactivity and shifts labeling from microsomes to dictyosomal fragments and mitochondria.

Area of Science:

  • Plant Biochemistry
  • Cellular Biology
  • Membrane Lipid Metabolism

Background:

  • Phospholipids are crucial components of cellular membranes.
  • Choline is a key precursor for phospholipid synthesis.
  • Potato tuber slices provide a model system for studying plant cell metabolism.

Purpose of the Study:

  • To investigate the impact of aging on radioactive choline incorporation into potato tuber phospholipids.
  • To characterize quantitative and qualitative changes in phospholipid labeling during potato tuber aging.

Main Methods:

  • Incubation of potato tuber slices with radioactive choline.
  • Fractionation of cellular components to isolate subcellular fractions.
  • Measurement of lipoidal radioactivity in different fractions.

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Main Results:

  • Aging significantly increased total lipoidal radioactivity in potato tuber slices.
  • Labeling shifted from microsomes in fresh slices to dictyosomal fragments after 9 hours of aging.
  • After 24 hours of aging, labeling remained high in dictyosomal fragments and also appeared in a mitochondria-containing fraction.

Conclusions:

  • Potato tuber aging profoundly affects membrane phospholipid metabolism.
  • Aging induces dynamic changes in the subcellular distribution of newly synthesized phospholipids.
  • These findings highlight the metabolic plasticity of potato tuber cells during senescence.