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A. Krstinić, D. Kajba: PRVI REZULTATI OPLEMENJIVANJA STABLASTIH VRBA SAMOOPLODNJOM, POVRATNIM .. Šumarski list br. 5—6, CXIX (1995), 163—167 2. Selekcijom i kloniranjem uzgojenih plus varijapojavom različitih atavizama u potomstvu, a koji se nata moguće je dobiti nove genotipove, koji će se usispoljavaju fenotipski samo u homozigotno recesivnoj pješno koristiti u namjenskim nasadima za proizvodkombinaciji gena za određeno svojstvo!) nju biomase u kratkim ophodnjama. 4. Uzgojene nove biljke stablastih vrba iz samoo3. Opisani način oplemenjivanja stablastih vrba hi-plodnje, divergentne genetske konstitucije omogućuje bridizacijom omogućuje, kroz rekombinacije, stvaranam proizvodnju tzv. linijskih hibrida. Linijski hibridi nje takvih genotipova, koji se mogu koristiti u hortidali su odlične rezultate u oplemenjivanju poljoprivkulturi, te u izučavanju evolucije vrsta roda Salix (npr. rednog bilja, posebno kukuruza. LITERATURA — REFERENCES Bisoffi, S. 1989: Recent Developments of Poplar Breeding in Vidaković, M., 1963: Među vrsno križanje Pančićeve omorike Italy. Proc. of the IUFRO Meeting Working Party S (Picea omorica [Pančić] Purkyne) sa sitkanskom smrčom 2.02.10:18-43, Hann. Miinden. (Picea sitchensis [Bong] Carr.). Šumarstvo 10-12:337-342, Beograd. Jovanović, B. & A. Tucović, 1964: Prva inbriding generacija monoecijskog stabla crne topole (Populus nigra L.) u Vidaković, M., 1966: The occurence and meaning of heterosis okolini Kosovske Mitrovice. Topola 42-43:13-19, Beograd. in hybrids within and between species. Sum. list 90:105122, Zagreb. Keiding, H., 1991: Gene conservation and tree improvement. Lecture Note No. D-9, Danida For. Seed Centre, 18p, Hu-Vidaković, M. & A. Krstinić, 1985: Genetika i oplemenjimlebaek. vanje šumskog drveća. Liber, 505p, Zagreb. Krstinić, A., 1971: Occurrence of monoecia and hermaphrodiZsuffa, L., 1988: Studies in Genetics and Breeding of North tism in hybrid Willow (Salix matsudana tortuosa x S. alAmerican Willows at the Faculty of Forestry, University ba). FAO, International Poplar Commission, 7p, Bucarest. of Toronto. Proceedings of the Willow Breeding and Biotehnology Development, 14-22, Bristol. Krstinić, A., 1976: Varijabilnost bujnosti rasta i pravnosti debla hibrida bijele vrbe (Salix alba L.) i krhke vrbe (Salix Zsuffa, L. & R. L. Gambles, 1992: Improvement of Enerfragilis L.). Glas. za šum. pokuse, Vol. XIX: 103-245, Zagy- Dedicated Biomass Production Systems. Biomass and greb. Bioenergy Vol. 2, No. 1-6, 11-15, Pergamon Press. Krstinić, A. & I. Trinajstić, 1992: Pojava monoecije i herma-Zsuffa, L., Salazar, R. & B. Danick, 1987: Biomass gefroditizma u hibrida Salix matsudana Koidz. x S. alba L. netics and breeding. Anali za šumarstvo 13/1-2:25-37, ZaŠum. list 9-10:389-395, Zagreb. greb. Mosseler, A. & L. Zsuffa, 1989: Sex expresion and sex raŽufa, L., 1963: Novi slučajevi hermafroditizma kod vrsta Poputions in intra and interspecific hybrid families of Salix L. lus nigra L. i P. thevestina Dođe i njihovo značenje. ToSilvae Genetica 38:12-17, Frankfurt a. Main. pola 1/2:21-26, Beograd. SUMMARY: To meet the requirements of biomass production in short rotations, the White Willow (Salix alba L.) has been crossed with the Chinese Willow (Salix matsudana Koidz.). For the first time the improvement methods of selfing, back cross and transgression have been used. Crossing of the Chinese, tortuous Willow (Salix matsudana f tortuosa Koidz.) with the autochtonous White Willow produced interspecific hybrids which in higher percentage were monoecious. By selfing the hybrids 25 plants have been raised. Due to their poor vitality, the only one survived plant was male and was used to obtain pollen for hybridization. Back crosses of F´ generation hybrids were made on the Chinese Willow, while for the production of F2 generation hybrids, the genetically divergent (New Zealand, Croatia) hybrids Salix matsudana x Salix alba were used. Improvement by hybridization using selfing, back cross and transgression proved that on the basis of transgression plus variants can be produced with respect to biomass. Using a mentioned improvement methods, a large number of minus variants also became differentiated in the progeny. Phenotypically, in addition to dwarfness size, they show the characteristics which occured as the result of the appearance of atavisms (such as small narrow leaves, small stem and branchlets covered with periderm, etc.) thus being suitable for arborescent Willow evolution studies. Cloning plus variant it was possible, in the produced families, to make selection of new genotypes of Arborescent Willows that will be suitable for biomass production in short rotations. Morphologically aberrant minus variants can be used in horticulture. Key words: Arborescent Willows, biomass, improvement by selfing, back cross and transgression. |