TY JOUR TI Phenotypical and genetic breeding evaluation silver birch (Betula pendula ROTH) and downy birch (Betula pubescens EHRH.) ex situ and in vitro KW Betula pendula Roth. KW Betula pubescens Ehrh. KW self-fertility KW self-sterility KW juvenile age KW in vitro culture KW polyploidy KW primary explant KW multiplication factor KW metaphase plate JO Forestry Engineering Journal AU Isakov, I.Y. AU Tabatskaya, T.M. AU Vnukova, N.I. AU Mashkina, O.. AU Mikhin, V.I. AU Govedar, Z.. PY 2023 IS 13 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov