Abstract
The localization of Ca ++ ions and peroxidase activity were studied cytochemically during succesive phases of callose synthesis in the cells of dyads and tetrads of Larix decidua. It has been found that at the time preceding the formation of callose wall separating the dyad and tetrad cells there occurs an increase in peroxidase activity and an accumulation of Ca ++ ions in zone of callose wall formation. These results suggest a physiological part of these factors in callose synthesis.
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