INVESTIGATION OF CALLUS FORMATION AND SHOOT-INDUCING PROCESSES IN STRAINS AND F-1 INTERSTRAIN HYBRIDS OF STRAWBERRY FRAGARIA-VESCA L

Peculiarities of callus formation and shoot-inducing in vitro were stu died in strains and F-1 interstrain hybrids of strawberry Fragaria ves ca. The strains were marked by genes affecting the structure and type of plant development (ast1, ast2, ae, etc). To induce callus formation , an MS medium containing 1 mg/l of BAP and 1 mg/l of NAA was used, an d leaf plates were taken as explants. The intensity of shoot-inducing was examined on explants of apical buds in a medium with 1 mg/l of BAP . The strains differed in callus-formation intensity and shoot-inducin g, the size and color of calli, and by response to experimental condit ions, i.e., the season. The F-1 hybrids showed intermediate expression of callus-formation intensity, a dominance of large calli over small, and white color over green. A low tillering ability dominated over me dium and high, which corresponded with the inheritance of this charact er in vivo.