The purpose of this publication is to review and analyze the main studies Manna ash in Bulgaria or-der present summarized information acquire an objective view possibilities for proper per-ception importance local tree species its use various aspects science practice our country. study covers period from second half 1940s, when first specialized journals field forest were published, until 2022....

We n&asured leaf respiration in 18 eastern deciduous forest tree species to determine if there were differences in tempera i m-respiration response functions among species or among c opy positions. Leaf respiration rates were measured in situ an4 on detached branches fordcerpensylvanicum L., A. rubrum i., Betula spp. (B. alleghaniensis Britt. and B. renta L.), Caryq glabra (Mill.) Sweet, Cornus...

We investigated the sensitivity of dormant Polish-provenance Fraxinus excelsior L. seeds to extreme desiccation and liquid nitrogen (LN, -196 degrees C). Germination and seedling emergence tests revealed that the critical water content (WC) of the desiccated seeds was 0.04-0.06 g H(2)O g(-1) dry mass, g g(-1) (0.04 g g(-1) in the germination test and 0.06 g g(-1) in the seedling emergence test)...

Flooding induced several physiological and morphological changes in Fraxinus pennsylvanica seedlings, with stomatal closure among the earliest responses. Subsequent changes included: reduction in dry weight increment of roots, stems, and leaves; formation of hypertrophied lenticels and production of adventitious roots on submerged portions of the stem above the soil line; leaf necrosis; and lea...

In excised embryos of Fraxinus ornus, the first macroscopic sign of germination is a curvature near the root apex. Histological studies show that this curvature is due to cell elongation on the convex side and is accompanied by cell division. Metabolic changes, manifested by the disintegration of protein bodies and tissue differentiation, also occur during this time. In embryos treated with phl...