Morphological variability of H. [Helianthus] giganteus L. and H.[Helianthus] maximiliani Sch. populations
2000
Miljanovic, T. (Faculty of Natural Sciences, Novi Sad (Yugoslavia). Institute of Biology) | Boza, P. | Atlagic, J. | Skoric, D.
Morphological variability of two Helianthus species, Helianthus giganteus and Helianthus maximiliani (section Divaricati), was assessed at the Institute for Field and Vegetable Crops, Novi Sad (Serbia, Yugoslavia). Fifteen populations of each species, with five plants per population, and thirty characters for each plant were analyzed. Three Helianthus giganteus populations were found to differ morphologically in relation to the typical populations. Population 78 differed in the number of leaves per stem, length of involucral bracts and the length of ray flowers; population 2014 differed in leaf colour and width and the angle between lateral veins and the midrib; population 2018 differed in stem colour and the dentation of leaf margin. These populations originated from the western boundary of the distributional range of Helianthus giganteus where species variability is high, representing specific adaptations that play an important role in the evolution of the species.
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