DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 10-11/1974 str. 46 <-- 46 --> PDF |
11. Ni čot a B. (1961): Pojava dvopolnih cvetova kod Populus thevestina, Topola, br. 22—23, Beograd 12. Ni čot a B., Stamen kov M. (1967): Hermafroditni cvetovi kod bukve (Fagus moesiaca), Šumarski list, br. 7—8, Zagreb 13. Popnikol a N. (1965): Pojava dvopolnih (biseksualnih) cvasti kod belog bora (Pinus silvestris), Šumarski list, br. 9—10, Zagreb 14. Popnikol a N. (1971): Dvopolne cvasti kod jele, Simpozium Josif Pančić, Goč 15. Popnikol a N. (1972): Heterovegetativno razmnožavanje jele u uslovima Zapadne Makedonije, doktorska disertacija (rukopis), Bitola 16. Pravdi n I. F. (1950): Polovoj dimorfizm u sosni obiknovennoj, Trudi Instituta lesa AN SSSR, Tom III, Moskva 17. Rohmeder E., Schönbach H. (1959): Genetik und Züchtung der Waldbäume, Hamburg und Berlin 18. Seit z F. W. (1954): Über das Auftreten von triploiden nach der Selbstunganomaler Zwitterblüter einer graupapelform, Zeitschrift für Forstgenetik, Vol. III, br. 1, Frankfurt 19. T u c o v i ć A. (1967): Genetika sa oplemenjivanjem biljaka, Beograd 20. Vidakovi ć M. (1966): Genetika i oplemenjivanje šumskog drveća, Zagreb 21. Žuf a L. (1963): Slučajevi hermafroditizma kod vrste topola Populus nigra i Populus thevestina i njihov značaj, Topola, br. 34—35, Beograd Summary SELECITON AND CULTIVATION OF FOREST TREE SPECIES ON THE BASIS OF THEIR SEXUALITY On the basis of the author´s expositions the following conclusions may be drawn: 1) The sexuality is the starting basis of selection, improvement and cultivation of forest tree species, which are generatively propagated (through seeds). 2) The sexuality of individual forest tree species should be studied better and more completely, and that from the biological, physiological and genetical aspects. 3) The heritability of many characters of forest tree species cannot be successfully followed up independently of their sexuality. 4) When cultivating dioecious tree species greater attention should be paid in the future to the representativeness and percentage share of male and female trees in all stand and forests, because their value and yield depend on it. 5) The characters of forest tree species are inherited both through autosomes and through sex chromosomes, and this should also be taken into account when regulating the sex structure in the stands. 6) In cultivation of monoecious tree species the sexuality is expressed in the form of a higher or lower maleness or femaleness of trees. 7) The strength of sex expressivity in monoecious trees is especially significant in the selection of seed crop stands, reconstruction of natural forests, and in general wherever yield of seeds plays a decisive or important role. 8) The strength of sex expressivity in monoecious trees is also significant in respect of the growth and increment of trees. 9) Sexuality is a starting basis also of selection, improvement and cultivation of forest tree species, vegetatively propagated (from stumps, roots branches, cuttings, setts, etc.). 10) Attempts ought to be made first to clonally propagate and spread good genotypes of all the forest tree species (whether they be generatively or vegetatively propagated), and in this connection to consider scientifically the problems bound to the sexuality of the initial material. In the selection and cultivation of forest tree species on the basis of their sexuality there also arise numerous problems. In so far as they are at least exactly considered, understood and formulated, the aim of the present explanations has been achieved. |