Model of experimental clonal seed orchard for the production of Serbian spruce šPicea omorika /Panc./Purkyne) intraspecific hybrids

The presented model for the establishment of an experimental clonal seed orchard of Serbian spruce was designed based on the results of the analysis and assessment of the genetic potential of Serbian spruce seedling seed orchard at Godovik. Based on the results of the analyses, eight superior half-sib lines of Serbian spruce were selected, of which 24 genotypes were selected. Their hybridisation, by the model of incomplete diallel cross resulted in 21 combinations at the level of half-sib lines, i.e. 48 combinations at the level of parent genotypes. The applied study methods identified the potentially valuable genotypes-cone producers i.e. pollinators, which will be fixed by cloning in the seed orchard of the second generation for the production of the promising hybrids

Conservation and directed utilization of forest genetic resources

Forest genetic resources represent the genetic diversity contained in the thousands of species of forest trees on the earth. their conservation is a set of activities and strategies, which are performed in the aim of ensuring the continued existence, evolution and availability of these resources for the present and future generations. the aim of genetic resource management is the enhancement of conditions for the continual evolution of the species which is the defensive mechanism of the organisms in the struggle with environmental changes

Variability of morphometric characteristics of the leaves of European white elm from the area of Great War Island

The European White Elm (Ulmus effusa Willd.) is indicated as a rare and endangered species in the growing stock of the Republic of Serbia. In the area of Great War Island, its natural populations were reduced to 56 registered trees, which occur in three spatially isolated subpopulations. On the basis of the research conducted on the level of variability of adaptible morphometric characteristics of leaves from 14 selected test trees of European White Elm, it can be concluded that the degree of interpopulation variability is satisfactory, which is a good basis for the conservation of the available gene pool

Variability of morphometric leaf characteristics of black poplar from the area of Vojvodina

A morphological study of intra and interpopulation variability of black poplar leaves was conducted in two populations in the area of Vojvodina. Nine morphometric parameters of leaves have been analyzed. The results indicate that there is considerable variability within and between the populations. Morphological differentiation is clearly represented with the average values of analyzed parameters and a statistically significant difference between the mean values. On the basis of the obtained data, it has been concluded that the variability within the two populations is much more expressed than the variability between them. The uniformity of environmental conditions of the studied locations indicates that this variability is a consequence of the specific gene pool of the studied populations

Comparative analysis of the anatomical structure of heartwood and sapwood selected Gymnocladus canadensis Lam. trees in Srpska Crnja

This paper shows the results obtained from the study of the macroscopic-microscopic structure (capillary system) in the growth stem of Gymnocladus canadensis Lam. originating from North America, which grows in 'Muzljanski rit' in the area of Srpska Crnja. Gymnocladus canadensis Lam. falls under the ring-porous species according to its porosity, with large tracheas in its early zone. The early zone trachea lumens, contained in the sapwood, reach dimensions of up to 160 μm, while early zone trachea lumens in the growth stem rings of the sapwood reach dimensions of up to 120 μm. Examination of the microscopic structure of this tree show good properties of the tree.Projekat ministarstva br. 3104

Heavy metals in the leaves of tree species paulownia elongata syhu in the region of the city of Belgrade

Based on the analysis of the heavy metal content (Zn, Fe, Pb, Cu, Ni, Cr Mn, Cd, As, Hg) in leaves of the trees growing in the urban part of the city of Belgrade, wider city area and rural area it may be noted that the content of Fe, Pb, Ni, Cr and Cd increases going from rural to urban area. The obtained results may be related to the increased air pollution in urban and suburban areas where some of these heavy metals appear as a direct consequence of fuel combustion. The level of tolerance of the species Paulownia elongata S.Y.HU towards air pollution represents the basis for its development and survival in urban conditions as well as setting up of tree alleys and forming wind protection zones along main traffic lines

The growth of one-year-old narrow-leaved ash seedlings is strongly related to the leaf area parameters

The leaf area of plant leave scan be considered as an indicator of the plant growth conditions, and its variability is usually associated with adaptation and response to the changing environment. The aim of this study is to investigate the relation of the leaf area parameters on growth of the narrow-leaved ash 1+0 seedlings from the nursery trial and determining variability between the 18 half-sib lines. The seedlings were obtained from seeds collected from 18 maternal trees found in the area of the special nature reserve Upper Danube Region. Ten randomly selected 1+0 seedlings per half-sib line were selected for further study, and all leaves per seedling were collected, herbarized and scanned. The leaf area of each leaf (LACL) was measured using an open-source image processing program – ImageJ, and the total leaf area per seedling (TLA) was calculated. Also, the number of leaves per plant (NCL) as well as the number of leaflets within each imparipinnate compound leaf (NLCL) were counted. The results showed that differences between studied attributes were statistically significant among 18 selected half-sib lines (p < 0.05). The most variable parameter was the total leaf area per seedling (TLA; CV=68.98%), which is strongly correlated to the leaf area per each leaf (LACL; r=0.95) and the number of leaflets (NLCL; r=0.94). In this study, we confirmed that leaf parameters were highly correlated to the growth of one-year-old Fraxinus angustifolia seedlings

VARIJABILNOST MORFOLOŠKIH KARAKTERISTIKA LISTOVA DIVLJE KRUŠKE (Pyrus pyraster (L.) Burgsd.) NA PODRUČJU PIO „KOSMAJ“

Divlja kruška je na prostoru Srbije autohtona vrsta drveća koja je svrstana u kategoriju vrsta „pod rizikom“. Hibridizacija sa kultivarima koji se uzgajaju za proizvodnju voća je veoma česta, što otežava identifikaciju čistih divljih voćkarica i predstavlja jedan od ugrožavajućih faktora koji dovode do genetičke erozije autohtonog genofonda. Cilj rada je utvrđivanje unutarpopulacione varijabilnosti selekcionisanih test stabala divlje kruške na području Predela izuzetnih odlika „Kosmaj“, kao osnove za konzervaciju raspoloživog genofonda. Listovi su sakupljeni sa 16 test stabala selekcionisanih na području Kosmaja (100 listova po stablu), na kojima su analizirani sledeći kvantitativni i kvalitativni parametri: dužina lisne ploče, maksimalna širina lista, dužina lisne ploče od osnove lista do dela na kome je merena maksimalna širina, dužina peteljke, ugao vrha lista, ugao osnove lista, površina lisne ploče, obim lisne ploče, odnosno oblik lista, oblik osnove lista, oblik vrha lista, obod lista. Sakupljeni listovi (ukupno 1600) su herbarizovani, skenirani i izmereni pomoću softvera ImageJ, dok je statistička obrada podataka urađena pomoću softvera Statgraphics Centurion XVII i Statistica 6.0. Materinsko stablo 35 se izdavaja u odnosu na druga na osnovu dobijenih prosečnih vrednosti kvantitativnih parametara, dok se materinsko stablo 27 izdvaja na osnovu kvalitativnih parameter. Rezultati istraživanja pokazali su da su sve dobijene vrednosti statistički značajne (p < 0,05), što ukazuje na postojanje zadovoljavajućeg stepena genetičke varijabilnosti između ispitivanih stabala, koji predstavlja dobru osnovu za očuvanje i usmereno korišćenje genofonda ove vrste