engleski

Selection of genotypes of Service tree (Sorbus domestica L.) with regard to seed quality

Service tree seeds were collected in autumn 2021 from five trees (genotypes) originating from five localities in the Republic of Croatia: Kravarsko, Cekovići, Šiljakovina, Daruvar and Velika. Seeds were taken from fruits immediately after harvest and stored at room temperature until the time of scanning, weighing and stratification. Stratification was done according to ISTA recommendations for overcoming seed dormancy in species of the genus Sorbus L. After stratification, all germinated seeds were counted. A total of 1287 seeds from five trees were sown in Dunemann nursery beds on March 29, 2022. Seed weight was statistically different between trees, ranging from 0.02552 g (Cekovići) to 0.04385 g (Velika). The tree from Velika is characterised by the highest values of the following seed characteristics: projected area (mm2), straight length (mm) and curved length (mm). The percentage of germinated seeds after stratification averaged 30.82%, ranging from 10.75% (Velika) to 56.04% (Kravarsko). Seed germination was complete 49 days after sowing (May 10, 2022). Germination ranged from 37.00% (Cekovići) to 66.00% (Velika) or an average of 52.77% for all 5 trees. From these studies, it can be concluded that the selection of the Service tree from Velika is justified, given the quality of the seed. Such genotypes are interesting for forestry (forest seedlings, clonal seed orchards) and fruit growing (raising grafted fruit trees).

seed mass ; seed morphology ; stratification ; nursery germination

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