10th Symposium on the Flora of Southeastern Serbia and ...

10 th <strong>Symposium</strong> on the Flora of Southeastern Serbia and Neighbouring regions,Vlasina 17 to 20 June 2010Carduus acanthoides, Salvia nemorosa, Astragalus onobrychis, Medicago sativa,Vicia villosa, Lamium purpureum i Ballota nigra. Najveći intenzitet sekrecije nektarau toku 24 časa, zabeležen je kod vrsta Prunella vulgaris, Mentha aquatica, Lamiumpurpureum i Linaria vulgaris, a najmanja dnevna količina nektara je izlučena ucvetovima Melilotus officinalis. Poređenjem nektarskog potencijala biljaka uispitivanoj korovskoj apiflori, a s obzirom na atraktivnost za polinatore, floralnuproduktivnost, brojnost i pokrovnost, kvalitetnom dopunskom pčelinjom pašom moguda se smatraju sledeće vrste: Salvia nemorosa, Echium vulgare, Vicia villosa, Astragalusonobrychis, Medicago sativa, Balota nigra, Prunella vulgaris i Trifolium pratense.Morphological variabillity of the species Ambrosiaartemisiifolia L. 1753 and A. trifida L. 1753 (Asteraceae,Heliantheae) from different habitats in Backa (Vojvodina,Serbia)Rat, M., Bojčić, S., Anačkov, G., Vukov, D., Igić, R., Boža, PUniversity of Novi Sad, Faculty of Sciences, Department of Biology andEcology, Novi Sad, Serbiamilica.rat@dbe.uns.ac.rsInvasive plant species, introduced from the North American, disturb theautochthonous vegetations in the area of the Pannonian Serbia. Taken measuresagainst invasive species that are carried out in Vojvodina, indicate the necessity ofanalyzing their morphological characteristics and phenotypic plasticity. Primarily,this analysis are important for the efficient prevention of their spread.Studies have included morphological characteristics of species Ambrosiaartemisiifolia and A. trifida, from ecologicaly diffrent habitats in Backa region. Theanalysis was conducted on 180 individuals from three localities, which are processedat 14 biometric characters of vegetative and generative region. The growth rate isbased on measurements after mechanical treatment plants at each location.The data were analyzed by classical methods and multivariate statistics.Analysis were conducted using Statistica for Windows ver. 9.0.The data indicate a different degree of phenotypic adaptation observed in differenttypes of habitats on the basis of several characters (leaf area, number ofinflorescence etc.). Mechanical treatment plants that have been exposed to, lead to areduction in the area of potential growth, which directly affect the growth rate andnumber of lateral shoots, which is highly correlated with the inflorescenceorganization, and number of flowers in them.34