Abstract
Aging of isolated spinach chloroplasts results in an acid shift of the pH optimum for electron flow through both photosystems or through either photosystem (PS) alone. Added linolenate has similar effects on the pH dependence of electron transport. Unsaturated fatty acids, predominantly linolenate, are released during aging and the changes in electron flow activity are correlated to the release of fatty acids. The formation of free fatty acids (FFA) is thus at least one cause of the alteration in the electron transport activities of aged chloroplasts.
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