Abstract
Isolated chloroplasts manifest structural changes upon illumination as measured by 90° light-scattering or absorbancy (1,2,3). These effects produced by actinic light have been correlated with volume changes by Itoh, Izawa, and Shibata (4), and others (5,6) in spinach chloroplasts. Osmotic volume changes of spinach chloroplasts in, vitro have also been observed by Nishida (7). It has also been observed that chloroplast membrane fragments (8) and chromatophore preparations from Rhodospirillum, rubrum show light-scattering changes similar to those seen for whole chloroplasts (9). These observations suggested that membrane fragments may also possess the ability to undergo volume changes, and that such phenomena may collectively account for the observed volume changes of intact chloroplasts. Hence an investigation was made to determine whether fragments of chloroplast membranes can undergo volume changes by osmotic and light-induced mechanisms.
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