Ivana Dragicevic

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Potato (Solanum tuberosum cv. Désirée) shoots grown in vitro in continuous darkness or in long days (LDs), were used to investigate indole-3-acetic acid (IAA) effects on stolon initiation and tuber formation, combining IAA with increased or decreased gibberellin levels. An increased gibberellin (GA) level was achieved by the applying 1 μM GA3, while(More)
Genes encoding cytokinin oxidase/dehydrogenase (CKX) enzymes have been used lately to study cytokinin homeostasis in a variety of plant species. In this study AtCKX2-overexpressing potato plants were engineered and grown in vitro as a model system to investigate the effects of altered cytokinin levels on tuber formation and tuber size. Protein extracts from(More)
Cytokinin oxidase/dehydrogenase (CKX) is the only known enzyme involved in cytokinin catabolism. Genes coding for two Arabidopsis CKX isoforms, AtCKX1 and AtCKX2, were introduced separately into a binary cloning vector, immobilized into Agrobacterium tumefaciens strain GV3101, and introduced into root explants of centaury (Centaurium erythraea Rafn.). The(More)
The plant hormones cytokinins (CKs) regulate a number of physiological processes. Their homeostasis is controlled by the rate of de novo synthesis and the rate of catabolism. The aim of this work was to analyze the content of total as well as individual groups of endogenous CKs in AtCKX1 and AtCKX2-overexpressing centaury (Centaurium erythraea Rafn.) plants(More)
Phytohormones are important regulators of numerous developmental and physiological processes in plants. Spontaneous morphogenesis of the common centaury (Centaurium erythraea Rafn.) is possible on nutrition medium without addition of any plant growth regulator depending solely on endogenous phytohormone levels. Thus, this plant species represents a very(More)
The invasive algae in the Mediterranean Caulerpa taxifolia and Caulerpa racemosa var. cylindracea have gained much interest in the Adriatic Sea due to their fast spread and negative impacts on native seaweed species. Lack of accurate mapping and its overall high costs present some of the major difficulties for successful detection and subsequent(More)
A new strategy by which to defeat Carter's "anthropic" argument against extraterrestrial life and intelligence is presented. Our approach is based on relaxing hidden uniformitarian assumptions and considering instead a dynamical succession of evolutionary regimes governed by both global (Galaxy-wide) and local (planet- or planetary system-limited)(More)
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