Photocontrol of organelle and cell type specific changes in the polypeptide composition ofEuglena and sorghum

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Abstract
Two‐dimensional (2‐D) gel electrophoresis has been used to follow changes in cell type specific and organelle localized polypeptides upon exposure of etiolated sorghum shoots and dark‐grown resting Euglena to light. Total protein extracted from isolated bundle sheath strands and mesophyll protoplasts was resolved by 2‐D gel electrophoresis. The cell type specific polypeptides were localized on the whole shoot 2‐D gel map in order to determine changes in the levels of these polypeptides upon light exposure. An image analyzer was used to analyze fluorographs of 2‐D gels of total Euglena protein pulse‐labeled with [35S]sulfate in the dark, immediately upon light exposure and 1, 4, 14, 24, 48 and 72 h after light exposure. The subset of polypeptides whose relative rats of synthesis changes more than threefold immediately upon light exposure was i dentified. The different patterns of changes in the rate of synthesis of this subset of polypeptides were followed.