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Bojovic S.,University of Belgrade | Nikolic B.,Institute of Forestry | Ristic M.,Serbian Institute for Medicinal Plant Research Dr Josif Pancic | Orlovic S.,Institute for lowland forestry and environment | And 3 more authors.
Chemistry and Biodiversity | Year: 2011

The particular significance of the whitebark pine (Pinus heldreichii Christ.) stems from the fact that it is a tertiary relict and Balkanic subendemite covering a very narrow and intermittent area in Serbia. A representative pool of 48 adult trees originating from three populations, one recently discovered natural (Population I) and two planted populations (Populations II and III) was investigated in order to evaluate the intra-and interpopulation variability of the essential oil of the complete fund of P. heldreichii in Serbia. In the pine-needle-terpene profile, 104 compounds were detected, 84 of which could be identified. Among the essential-oil constituents, monoterpenes and sesquiterpenes dominated, comprising ca. 90% of the essential oil. The terpenic profile of Population I was characterized by a predominance of monoterpenes (e.g., limonene (1), α-pinene, and Δ 3- carene (4)), while sesquiterpenes (e.g., germacrene D (2) and β-caryophyllene (3)) obviously preponderated in the profile of Populations II and III. This study also demonstrated that the abundance of whitebark pines in Serbia had significantly changed over the last few decades. The number of individuals in the natural population had increased, while the number of individuals in the planted populations had decreased. Today, the whitebark pine fund in Serbia comprises less than 250 trees. © 2011 Verlag Helvetica Chimica Acta AG, Zürich. Source


Halmagyi A.,Romanian Institute of Biological Research | Kevresan S.,University of Novi Sad | Kovacevic B.,Institute for lowland forestry and environment | Orlovic S.,Institute for lowland forestry and environment | And 3 more authors.
Acta Horticulturae | Year: 2010

The study describes the effect of naphthenates and their fractions on rooting of in vitro grown Sequoia sempervirens (Lamb. ex D. Don) Endl. shoots. Natural naphthenic acids have been isolated by alkaline extraction from the middle gas fraction of the crude oil. Sequoia sempervirens shoots (1 cm in length) were grown on Murashige and Skoog (1962) (MS) medium supplemented with either total naphthenate preparation, naphthenate fractions obtained by extraction on different pH (pH 2, pH 4, pH 7 and pH 9), or indole-3-butyric acid (IBA) in different concentrations (twenty treatments tested). The rooting testing was based on number and total length of roots formed after four weeks of in vitro growth. Similarly to total length of roots, the highest number of roots per explant (≈7) was achieved in medium containing 50 μM of the naphthenate fraction extracted at pH 2 and in medium containing 50 μM of the fraction extracted at pH 9. That is triple higher than in the control and significantly better than in the best IBA-treatment (50 μM IBA), where five roots per explants in average were formed. Similar to the results obtained for some agricultural and tree forest species, our results with Sequoia sempervirens confirm the possibility of rooting stimulation by naphthenates. Source


Kovacevic B.,Institute for lowland forestry and environment | Orlovic S.,Institute for lowland forestry and environment | Ivanovic M.,Serbian Institute of Field and Vegetable Crops | Cobanovic K.,University of Novi Sad | And 3 more authors.
Genetika | Year: 2011

The relationship between twelve genotypes of eastern cottonwood (Populus deltoides Bartr.) was analyzed according to sixteen early rooting traits and cutting survival. Principal component analysis (PCA) and cluster analysis were used on data that were standardized by common and by one alternative way of standardization. Alternative way of standardization (standardization with within-genotype standard deviation instead of standard deviation of genotypes' means) was used in order to emphasize the contribution of genotype to the effect of differences among genotypes on total variation. After bought ways the first principal component had high correlation with the most of rooting traits and cutting survival, while the second was mainly related to the traits of root formation on the basal cut of cutting (wound roots). Three difficult-to-root genotypes (S6-7, S1-3, 129/81) were distinctly grouped against other examined genotypes, by bought principal component and cluster analysis. There was a slight difference in grouping of easy-to-root genotypes (B-229 and PE19/66) among examined ways of standardization. Source

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