Abstract
Aiming to produce forest reproductive material at the family level, we tested quality of twenty Fraxinus angustifolia Vahl half-sib lines in the nursery experiment. We measured height (HT) and root collar diameter (DIA) of one-year old seedlings, and we monitored germination rate and mortality during the first growing season. Seeds of 20 half-sib lines originating from Sombor area (north Serbia) were sown in seedbed on autumn 2016. The seed dormancy was not broken in all seeds equally, resulting with un-uniform germination over a two months period. All measured attributes shows a statistically significant differences, indicating a strong effect of genetic control. The highest average and DIA were measured in half-sib line 7 (22.62 cm; 5.79 mm, respectively). The lowest average DIA was measured in half-sib lines 18 (2.85 mm) and 19 (2.94 mm), which can be result of growing density effect (104 seedlings m-2 for line 18 and 126 seedlings m-2 for line 19, compared to 40 seedlings m-2 for line 7). The correlation between DIA and HT is strong and positive (R=0.90). Due to its morphological superiority, half-sib line 7 could be recommended for mass production of Fraxinus angustifolia seedlings at the family level.
 Keywords: Height; Root Collar Diameter; Seedlings Quality; Narrow leaved ash
Highlights
Aiming to produce forest reproductive material at the family level, we tested quality of twenty Fraxinus angustifolia Vahl half-sib lines in the nursery experiment
Due to its morphological superiority, half-sib line 7 could be recommended for mass production of Fraxinus angustifolia seedlings at the family level
Provenance region One consists of narrow-leaved ash forests (Fraxinus angustifolia Vahl) in Podunavlje and Posavina in Vojvodina and in Posavina, Pomoravlje and Podunavlje in Central Serbia at the altitudes up to 100 m (Cvjetićanin et al 2014)
Summary
Aiming to produce forest reproductive material at the family level, we tested quality of twenty Fraxinus angustifolia Vahl half-sib lines in the nursery experiment. The lowest average DIA was measured in half-sib lines 18 (2.85 mm) and (2.94 mm), which can be result of growing density effect (104 seedlings m -2 for line and 126 seedlings m-2 for line 19, compared to 40 seedlings m-2 for line 7). Due to its morphological superiority, half-sib line 7 could be recommended for mass production of Fraxinus angustifolia seedlings at the family level. Provenance region One consists of narrow-leaved ash forests (Fraxinus angustifolia Vahl) in Podunavlje and Posavina in Vojvodina and in Posavina, Pomoravlje and Podunavlje in Central Serbia at the altitudes up to 100 m (Cvjetićanin et al 2014). The selection of source for production of planting material should not be limited to local provenances, but rather extended to the best families according to survival and growth rates
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