Abstract
Calcium is present in the surface cells of both types of stigma. The chlorotetracycline method was used to show that the papillae of the dry stigma of <i>Primula officinalis</i> are the source of fluorescence of the CTC-Ca<sup>2+</sup> complex. The precipitation method (NHA) localized calcium ions mainly in the pellicula surrounding these papillae. The NHA-Ca<sup>2+</sup> precipitates were localized on the plasma membrane in the papillae of the wet stigma of <i>Ruscus aculeatus</i>. Ca-ATPase activity was found in both types of stigma in sites where the presence of Ca<sup>2+</sup> had been determined.
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