Abstract
Mitochondria from rat livers and cauliflower buds were used as model systems to determine if ehtylene treatments applied in vitro could induce changes in properties of lipoprotein membranes leading to increased permeability. The rate of mitochondrial swelling under different treatments was followed by spectrophotometric measurements of changes in the scattering of light by mitochondrial suspensions. Ethylene treatments applied in buffered test solutions of KCl increased the rate of swelling; no increase was observed in sucrose solutions. Calcium ions and carbon tetrachloride caused more rapid swelling than did ethylene. Apparently, ethylene can induce a limited change in membrane permeability. If the mitochondrial membrane is a factor in the regulation of respiration in plant cells, the respiratory response induced in plants by ethylene may be the result of increased membrane permeability.
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