TY JOUR TI New genetic sources for breeding of Prunus L. species on polyploid level KW Prunus L. KW hybrid KW polyploid KW clonal line KW in vitro KW chromosomal number KW pollen fertility KW pollen size KW genetic sources KW breeding. JO Agrarian Bulletin of the AU Mochalova, O.V. AU Gusev, D.A. PY 2019 IS 190 PB Ural State Agrarian University