Two fractions of the light fragments enriched in the photosystem I (PSI) complexes were obtained from pea (Pisum sativum L.) thylakoids by digitonin treatment and subsequent differential centrifugation. The ratio of chlorophyll a to chlorophyll b, chlorophyll/P700 spectra of low-temperature fluorescence, and excitation spectra of long-wave fluorescence were measured. These characteristics were shown to be different due to variation in the size and composition of the light-harvesting antenna of PSI complexes present in the particles obtained. The larger antenna size of one of the fractions was related to the incorporation of the pool of light-harvesting complex II (LHCII). A comparison with the data available allowed us to identify these particles as fragments of intergranal thylakoids and end membranes of granal thylakoids. The suggestion that an increase in the PSI light-harvesting antenna in intergranal thylakoids is related to the attachment of phosphorylated LHCII is discussed.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2004
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