The ultrastructure of the central zone cells of the shoot apex of Helianthus annuus

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Abstract
An ultrastructural study of the vegetative shoot apex of H. annuus L. cv. Peredovic showed that the cytoplasmic components of the central zone cells were similar to those of the mitotically active peripheral zone cells. The mitochondria, dictyosomes, endoplasmic reticulum, ribosomes and microtubules were not different either in their structure or in distribution in the 2 types of cells. The only difference was the presence of starch-containing plastids in the central zone, primarily in the 2 tunica layers in this region and their absence from peripheral and immediately subjacent regions of the meristem. Starch-containing plastids were observed in the differentiating pith cells. Plasmodesmata were observed [by EM] in the central zone and in walls between central and peripheral zone cells.

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