Within-day Changes in the Polyribosome Content and in Synthesis of Proteins in Leaves of Capsicum annuum L

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Abstract
C. annuum cv. California Wonder was grwon in controlled environment with a 12 h photoperiod. The polyribosome content of leaves varied from 60-72% of total ribosomes with the highest level occurring in the middle of the photoperiod and the lowest in the middle of the dark period. The variation was accounted for by changes in the content of large polyribosomes (hexamers and larger). There was no indication of an immediate effect on polyribosome content of light-on or light-off. The synthesis of proteins at 2 times in the 24 h cycle was compared using a dual isotope technique. Statistically significant results were obtained that suggested that protein(s) with MW of 26,000 daltons were preferetially synthesized in the photoperiod compared to the dark period. No evidence was found for the differential synthesis of proteins within the photoperiod.