Peculiarities of cellular structure of leaves in cultivated and wild sunflower Helianthus annuus L.
The cultivated and wild forms of <i>Helianthus annuus L. </i>were studied. The comparative characteristic of the leaf structure and the cellular ultrastructure of these forms was done. It is shown that artificial selection resulted in formation of highly effective leaf parenchyma at cultivated sunflower that promotes the intensive development of plants and their seed productivity.