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In this study, the effect of concentration of indole-3-butyric acid (IBA) (powder dip), cutting type as well as the time of taking cuttings on the rooting of softwood cuttings of cornelian cherry was examined. Four types of cuttings were used: basal cuttings, terminal cuttings, basal cuttings with 2-year-old wood and terminal cuttings with 2-year-old wood. The obtained results showed that IBA concentration, cutting type and time of collecting have significant effect on rooting. The best results were obtained using 1% IBA and cuttings collected in the second term (in mid-July) had a higher rooting percentage. Terminal cuttings treated with 1% IBA (powder dip) should be used for optimum results. In that case the rooting percentage was very high (over 90%) in both terms of cuttings collection. [Projekat Ministarstva nauke Republike Srbije, br. 43007: Istrazivanje klimatskih promena na zivotnu sredinu: pracenje uticaja, adaptacija i ublazavanje]

During past decades, great attention has been paid to propagation of endangered plant taxa in order to preserve biodiversity. The aim of this study was to optimize a protocol for in vitro propagation of the critically endangered and decorative species Dianthus serotinus Waldst. et Kit. The effects of different concentration of MS salt (Murashige and Skoog) of the culture, medium pH and different carbohydrates (sucrose, glucose, and fructose) on shoot multiplication were examined. The best results were obtained on half-strength MS (Murashige and Skoog) medium, whose pH was 5.8, with sucrose supplied at a concentration of 3%, when shoots with 1-2 nodes or shoot tips (with terminal buds only) were used as explants. The shoots were rooted (76.7%) on half-strength MS medium containing 0.5 mg∙L-1 NAA (1-naphthaleneacetic acid). The obtained plantlets were successfully acclimatized (89%) in a 4:1 mixture of peat and sand and they flowered the following year. Presented protocol enables successful in vitro propagation of D. serotinus.

The aim of this study was to establish an efficient protocol for the in vitro propagation of the endangered, endemic and decorative species Dianthus pinifolius Sibth. et Sm. The effects of different concentrations of 6-benzylaminopurine (BAP) and naphtalenacetic acid (NAA), and different explant types (single-node cuttings, terminal buds and shoot cuttings) on shoot multiplication were examined on Murashige and Skoog (MS) and halfstrength MS media. The best results were obtained for shoot cuttings on the MS medium supplemented with 0.5 mg/L BAP and 0.1 mg/L NAA, achieving a maximum rate of regeneration (100%) and a total of 15.4 newlydeveloped shoots per explant. The highest rooting rate (96.7%) was obtained on MS medium containing 1 mg/L NAA, while the acclimatization of the microplants obtained to ex vitro conditions was successful (88.9%).

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