Abstract
Anatomical and morphological development of a homeotic malformationknown as phyllody has been investigated in rose flowers (Rosahybrida cv. Motrea). The anatomical examination revealed that thephyllody of rose flowers is ensured from pistil transformation into leaf-likeorgans (phylloids). The study showed that the formation of leaf-like organs inplace of the pistils results from the cessation of normal pistil developmentexpressed by absence of marginal cell fusion of the style-tube primordia. Theunfolded style-tube develops transformed to a green leaf-like organ containingchlorophyll and stomata. On the other hand, the ovary-sack although containingstomata as well as remained chlorophyll, only partially malformed. Transversesection SEM showed that the anatomical structure of the leaf-like organs wassimilar to that of cauline leaves rather than to sepals. Following the resultsof the present study demonstrating the evolutionary association of floralorganswith leaves a hypothesis describing phyllody formation as an evolutionaryregression is proposed.
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