Abstract
Summary The significance of Cat+-ions in the overcrowding effect on ethylene production (Farber et al. 1986) was investigated. The pushing together of Spirodela polyrrhiza P 143 plants for 30 min results in a transitory increase of ethylene production. In freely floating plants, this effect could be imitated partially by adding the Caz+-ionophore, A23187. The Ca t+-channel inhibitor verapamil (500 ,M), inhibited the overcrowding effect completely. Culturing the plants for 18 hours on a Ca t+-free medium with 500 gM EGTA or treatment with 1 mm LaC13 had a similar effect, indicating that Ca 2+ is necessary for this reaction. Also the calmodulin blockers, W-7, chlorpromazine, trifluoperazine suppressed the transitory increase of ethylene evolution after pushing plants together, suggesting the involvement of calmodulin. All agents influenced the crowding effect on ethylene evolution only, but not on baseline ethylene production in freely floating plants.
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