engleski

PLANT HORMONES IN THE CHRISTMAS ROSE (Helleborus niger L.) REPRODUCTIVE DEVELOPMENT

Christmas rose (Helleborus niger L.), a native perennial of southeastern Europe, is characterized by an interesting phenomenon in the world of flowering plants: after fertilization perianth becomes green, photosyntheticaly active, and persists during fruit development. Removal of the reproductive organs(anthers and carpels) affects the elongation and vascular anatomy of flower stalk, prevents complete perianth greening, and promotes perianth senescence. Endogenous plant hormones auxins, gibberellins and cytokinins, identified and quantified in floral and fruit tissues, are shown to regulate post-anthesis development. Profile and dynamics of these signaling molecules are summarized and their potential role in coordination of floral organ development is discussed.

Christmas rose; reproductive development; auxin; cytokinin; gibberrelin

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