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The study was carried out in Serbian spruce (Picea omorika Panc/Purkyn?) plantations in the western Serbia. The paper presents results of the analysis of crown development. The following elements were analyzed: total tree height, height of the crown base, absolute and relative crown length, maximal crown diameter, coefficient of crown spreading and degree of crown girth. We discuss approaches to the modeling of tree crown growth and development, growing under favorable environmental and stand conditions, without anomalies in development. In order to establish the relationship between analyzed factors, regression analyses were applied. Data fitting was by the analytic method, by the implementation of Prodan?s functions of growth, linear and parabolic function. Received models can be used for the simulation of various growth and developing processes in forest.

The ability of random amplified polymorphic DNA (RAPD) to distinguish among Scots pine populations from Serbia was evaluated. Sixteen arbitrary 10-mer primers employed in the analysis produced 54 fragments of which 21 were polymorphic (38.89%). Certain rare and genotype-specific bands were identified which could be effectively used to distinguish between the populations. Polymorphism in RAPD markers among P. sylvestris populations was high and sufficient to distinguish each of the populations. The results obtained suggest that RAPD markers are valuable for the genetic divergence estimation in Pinus sylvestris and for the study of divergence among populations.

The regionalization of forest tree populations was researched on an example of beech, as the species with the largest range and the widest ecological amplitude in Serbia. The implementation of Monmonier's algorithm of maximum differences to analyze the spatial distances and the matrix of genetic distances generated by RAPD markers produced different results, depending on the method of addressing the genetic distances, so that data processing should be planned in accordance with the number of samples and their geographic location. The analysis is simple and enables a good visualization of genetic variability barriers which, in combination with the data on the distribution and the geographic barriers, can be utilized for recommending the transfer of forest tree reproductive material. U radu je istražena mogućnost određivanja granica regiona populacija šumskog drveća, u cilju davanja preporuka za transfer reproduktivnog materijala, na primeru bukve. Na osnovu podataka iz Nacionalne inventure šuma dobijena je rasprostranjenost bukve u Srbiji sa rezolucijom 4h4 km. Na osnovu ovako dobijene karte areala, odabrane su oblasti koje će na najrelevantniji način predstavljati bukvu u Srbiji. U okviru ovog istraživanja, ispitano je 27 populacija, koje relativno ravnomerno pokrivaju prostornu i ekološku distribuciju populacija bukve. Analiza primenom RAPD markera, urađena je sa 28 prajmera. Ukupno su dobijene 82 trake. Za vizualizaciju onih podataka koji su sadržani u matrici genetičkih podataka, putem crtanja granica na geografskoj karti, korišćen je Monmonijeov algoritam u programu AIS. Prikazani su rezultati tri načina pripreme genetičkih distanci za analizu, sa zadatim brojem od 5 barijera za detekciju. Rezultati korišćenja sirovih genetičkih distanci pokazuju najveći broj segmenata (regiona), što nagoveštava malu prostornu autokorelaciju. Rezultati korišćenja genetičkih distanci ispravljenih na osnovu geografskih distanci pokazuju nešto manji broj segmenata (regiona), što ukazuje na veću preciznost dobijenu ovakvom pripremom genetičkih distanci za relativno mali broj uzoraka koji su prostorno udaljeni. Rezultati korišćenja ostataka genetičkih distanci pokazuju najmanji broj segmenata (regiona), što ukazuje na veliku snagu ovakve pripreme genetičkih distanci u slučajevima slabo izražene prostorne autokorelacije. Ovim pristupom, najverovatnije je omogućena i najtačnija vizualizacija genetičkog diverziteta. Analiza je jednostavna i omogućuje dobru vizualizaciju barijera genetičke varijabilnosti, što se u kombinaciji sa poznavanjem areala i geografskih barijera, može uspešno iskoristiti za davanje preporuka za transfer reproduktivnog materijala šumskog drveća. Vizualizacija se može dodatno poboljšati korišćenjem rezultata ove analize za crtanje karata u nekom od široko korišćenih programa GIS-a, i njihovim preklapanjem sa kartama fizičkog reljefa i drugim tematskim kartama.

Picea omorika (Panc) Purkyn? (Serbian spruce) is a Balkan endemic coniferous species. We studied soluble peroxidase, catalase, polyphenol oxidase, and superoxide-dismutase activity in the needles of five omorika lines grown in a generative seed orchard. The peroxidase and polyphenol oxidase isoenzyme patterns were also investigated. Activity of the studied enzymes varied among different lines. The highest activity of peroxidase, catalase and polyphenol oxidase was found in the A3 ("borealis") and B5 ("semidichotomous") lines. Four acidic and two basic peroxidase isoenzymes and one polyphenol oxidase isoenzyme were detected. There was no variation in either the peroxidase or the polyphenol oxidase isoenzyme pattern among the different lines.