Abstract

Summary The vegetative apices have a tunica-corpus organization and no cytohistological zonation. The corpus is divided into a central mother cell zone (CMZ), peripheral zone (PZ) and pith meristem (PM) based on analysis of the cell net. The tunica is 2-layered, the clarity of the layers depending on the plastochronic stage. The CMZ shows a decrease in depth from the minimal to the maximal stage of the plastochron. The inflorescence and floret apices show a mantle-core organization. In the young reproductive apex the axial cells of the mantle are ligthly stained. The complete inflorescence apex is used up in the production of bracts and florets.

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