Naslov
Genetic variation in quantitative traits within and among Croatian narrow-leaved ash (Fraxinus angustifolia Vahl) populations assessed in an open-pollinated progeny test

Autori
Bogdan, Saša ; Kajba, Davorin ; Franjić, Jozo ; Idžojtić, Marilena ; Škvorc, Željko ; Katičić Trupčević, Ida

Izvornik
Periodicum biologorum (0031-5362) 109 (2007), 1; 1-11

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
genetic differentiation; genetic drift; selection; breeding; flushing; height

Sažetak
BACKGROUND AND PURPOSE Narrow-leaved ash (Fraxinus angustifolia Vahl) is one of the most valuable forest species in Croatia, both economically and ecologically. Although knowledge about genetic variability is important prerequisite for sustainable forest management and conservation, it is scarse in this 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. MATERIALS AND METHODS Seeds were collected from 121 trees originated from 11 Croatian populations, one population in Spain and one population in Ukraine. Seeds were sown separately for each open-pollinated family in plastic containers which were randomly distributed in nursery located in Zagreb. Plant heights were measured, and flushing was assesed using a six 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 MIXED procedure. Tukey-Kramer test was conducted to asses differences beween studied populations. RESULTS AND CONCLUSIONS There were statistically significant differences between populations as well as between families within population, except for first growing season height, indicating between population genetic differentiation for studied traits. Populations Metković and Stara Gradiška showed greatest differentiation. There were no differentiation between populations originated from Posavina (the Sava river valley), except population Stara Gradiška. 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 differentiation probably caused by genetic drift. Genetic drift could also be explanation for differentiation of population Stara Gradiška, although, another possibility for its genetic differentiation could be selection against early bud burst due to frequent spring frosts in the area. There were no correlation between phenology and growth traits in nursery conditions.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo

POVEZANOST RADA