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Related Experiment Videos

Lipid transformations in greening and senescing leaf tissue.

D W Newman1, B W Rowell, K Byrd

  • 1Department of Botany, Miami University, Oxford, Ohio 45056.

Plant Physiology
|February 1, 1973
PubMed
Summary
This summary is machine-generated.

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Plant leaf greening and senescence involve changes in chlorophyll and fatty acids. Light exposure promotes chlorophyll and linolenate (18:3) increase, while darkness or abscisic acid accelerates degradation, particularly of 18:3.

Area of Science:

  • Plant Physiology
  • Biochemistry

Background:

  • Chlorophyll and fatty acid metabolism are crucial for plant development and senescence.
  • Light quality and plant hormones influence these metabolic processes.

Purpose of the Study:

  • To investigate the changes in chlorophylls and specific fatty acids during leaf greening and senescence.
  • To determine the effects of light treatments and abscisic acid on these changes.

Main Methods:

  • Analysis of chlorophyll a and b, and fatty acids (18:3, 18:2, 18:1, 18:0, 16:2, 16:1, 16:0) in greening and senescing leaf tissues.
  • Treatment of dark-grown tissues with red, far-red, or combined light, followed by white light exposure.
  • Observation of green barley and senescing cocklebur leaves under dark conditions.
  • Application of abscisic acid and sucrose to senescing tissues.

Related Experiment Videos

  • Radioactive acetate incorporation studies in lipids of senescing cocklebur leaves.

    • Main Results:

    • Dark-grown tissues exposed to white light after red or far-red pre-treatment showed increased chlorophylls and linolenate (18:3).
    • Green barley leaves in the dark lost chlorophylls and fatty acids, with a notable decrease in 18:3.
    • Senescing cocklebur leaves exhibited declining chlorophyll and fatty acids, especially 18:3.
    • Abscisic acid accelerated senescence-related changes, while sucrose did not.
    • Radioactive acetate incorporation into galacto-lipids and phospholipids of senescing cocklebur leaves initially increased then decreased.

    Conclusions:

    • Light quality significantly impacts chlorophyll and fatty acid profiles during greening.
    • Leaf senescence involves the degradation of chlorophylls and specific fatty acids, particularly linolenate (18:3).
    • Abscisic acid plays a role in accelerating leaf senescence processes.