Wood anatomy of representatives of the Rosaceae from northern Siberia. 2. Rosoideae and Prunoideae.

摘要

Descriptions are given of the wood anatomy of 4 species belonging to the subfamily Rosoideae (Dryas grandis, D. octopetala, Pentaphylloides fruticosa [Potentilla fruticosa] and Rosa acicularis) and one species of subfamily Prunoideae (Padus avium [Prunus padus]) from northern Siberia. Dryas grandis is described anatomically for the first time. The species studied can be separated using wood anatomy: Dryas grandis and Dryas octopetala have large radially elongated vessels in earlywood; Potentilla fruticosa has narrow rays and thick-walled tracheids; Rosa acicularis is noted as ring-porous wood with wavy boundaries, locally inflated broad rays and very long multiseriate rays; and Prunus padus has mainly homogeneous rays and libriform fibres besidesfibre-tracheids. Wood of these species from the Siberian subarctic zone has some distinctions in comparison with that from the places with much warmer climate: North-Siberian Dryas octopetala has wider multiseriate rays and scalariform perforation plates; Potentilla fruticosa has helical thickenings in vessels, scalariform perforation plates and rows of procumbent cells in rays; Rosa acicularis and Prunus padus are characterized by higher vessel frequency, shorter vessel elements and narrower vessels; Prunus padus has longer and narrower rays. These differences may be considered as ecological adaptation to the subarctic climate.