Abstract
The pollen wall of Gerbera jamesonii (Compositae) has very thick ektexine and endexine layers, which can be distinguished in sections by light microscopy. Exine synthesis must involve the transfer of a relatively large quantity of sporopollenin and its precursors into this massive wall. In Gerbera jamesonii , exine synthesis proceeds with the formation of the primexine within the microspore tetrad. Following callose dissolution, the endexine is laid down and finally the ektexine is greatly thickened and expanded. After the exine is completed, a large vacuole forms. Vacuole formation may be taken as the approximate end of exine synthesis. The results with Gerbera jamesonii show that glucose and sodium acetate pass through the callose wall, but phenylalanine apparently does not.
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