Naslov
Genetic Variation for Quantitative Traits Within and Among Croatian Fraxinus angustifolia Vahl. Populations Assesed in a Nursery Trial

Autori
Bogdan, Saša ; Kajba, Davorin ; Katičić-Trupčević, Ida

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Second Congress of Croatian Geneticists. Book of Abstracts. / Franekić-Čolić, Jasna ; Ugarković, Đurđica - Zagreb : Hrvatsko genetičko društvo, 2005, 91-91

Skup
Second Congress of Croatian Geneticists with International Participation.

Mjesto i datum
Supetar, Hrvatska, 24.09.2005. - 27.09.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
fraxinus agustifolia; progeny tests; genetic variation; quantitative traits

Sažetak
Narrow-leaved ash (Fraxinus angustifolia Vahl.) is one of the most valuable forest species in Croatia, both economically and ecologically. Species genetic variability is its main 'survival weapon' in changeable environment. Although knowledge about genetic variability is important prerequisite for sustainable management and conservation planning, it is scarse in the species. Therefore the aim of this study is to increase knowledge about narrow-leaved ash genetic variability in part of its distribution range in Croatia. Seeds were collected from 133 trees originated from 13 Croatian populations, one population in Spain and one population in Ukraine. Seeds were sown separately for each open-pollinated family in plastic containers filled with garden soil. Containers were randomly distributed on plastic folium in Department’ s nursery located in Zagreb. In autumn 2003 and 2004, plant heights were measured, and in spring 2004 flushing was assesed eight times between April 1st and May 3rd using a 6 points scale. Statistical analysis were done using SAS software package. GLM procedure was used for analysis of variance to study the among- and within-population variation. Variance components were calculated by VARCOMP procedure (REML method). Tukey-Kramer test was conducted to asses differences beween studied populations. There were statistically significant differences between populations as well as between families within population, exept for first growing season height. Variances caused by population effect had the greatest share in overall variation, indicating between population genetic differentiation for studied traits. Populations Metkovic and Stara Gradiska showed greatest differentiation. Since it is known that ash is very sensitive to late spring frosts, breeding for late bud burst could be useful, due to considerable genetic control of this trait. There were no differentiation between populations originated from Posavina, exept population Stara Gradiska. This can be explained by continuous distribution and gene flow in that part of the species distribution. In contrast, populations originated from submediteranean area showed pronounced differentiation probably caused by genetic drift. Genetic drift could also be possible explanation for differentiation of population Stara Gradiska, because at the time of seed collection, it had small population size due to final regeneration cut. Although, another possibility for genetic differentiation of the Stara Gradiska population could be selection against early bud burst due to frequent spring frosts in the area. The fact that trees left for final cut are dominant trees in a stand further enhance a second explanation for differentiation of the population. There were no correlation between phenology and growth traits in nursery conditions.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo

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