Energetic basis of the light-induced chloroplast shrinkage iu vivo

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概要

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• A light-induced chloroplast shrinkage occurring in vivo was measured with a Coulter counter and a packed weight technique using chloroplasts isolated within two minutes of harvesting pea plants. Introduction of the photosynthetic inhibitor DCMU (5 μM) into the plant either by bathing the cut stem or injection through a fine hypodermic needle decreased the light-induced chloroplast shrinkage in vivo 11 to 20%. The uncoupler tri-Fl-CCP (5 μM) inhibited the light-induced shrinkage 80%, while nigericin (0.5 μM) completely abolished it. An action spectrum for the chloroplast volume decrease in vivo had a shoulder at 700-715 mμ. These results are considered in terms of the various forms of energy available during photosynthesis. A consistent interpretation is that the light-induced chloroplast shrinkage in vivo depends either on a high energy state created by electron flow or on ATP. This chloroplast volume change upon illumination of the plants may increase the photosynthetic efficiency.

• 日本植物生理学会の論文

著者

• Nobel Park

  Department Of Botanical Sciences And Molecular Biology Lnstitute University Of California

• Nobel Park

  Department Of Biophysics And Biochemistry Faculty Of Science University Of Tokyo:department Of Biolo

関連論文

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• Energetic basis of the light-induced chloroplast shrinkage iu vivo
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