Abstract
Summary Etiolated wheat ( Triticum aestivum L.) mesophyll protoplasts swell within 30 min in darkness after a red light (R) pulse or after the addition of acetylcholine (ACh,1 μM), if 0.5 mM CaCl 2 is present in the medium. A pulse of far-red light immediately after R prevented swelling, whereas such a treatment had no effect on the ACh-induced response. The effectiveness of ACh was increased by the addition of eserine, an inhibitor of acetylcholinesterase. Apart from ACh, out of the choline derivatives tested only carbamylcholine was active in the induction of swelling. Swelling was also induced by ACh in a medium containing 0.5 mM KCI, whereas no swelling occurred under such conditions after R. The Ca 2+ -dependent ACh-induced protoplast swelling was prevented by Ca 2+ -channel blockers, Li + and calmodulin inhibitors.
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