Podvoy (rootstock), Chernivtsi region.

M9 rootstock is a typical dwarf rootstock, currently there are many clones of this rootstock. Like all dwarfs in the garden, it needs support in the form of a trellis. Varieties on this rootstock start fruiting early. The surface root system needs irrigation. Compatible with all varieties. The height of the tree does not exceed 3 m.
(//tractor-service.com)
Rootstock M 26 dwarf rootstock is stronger than M9. In some areas of horticulture, their growth is close to semi-dwarf. The garden needs constant support regardless. which has a more developed root system. Six-year-old trees reach a height of 3.5 m.

Rootstock MM106 is a medium-sized rootstock. Trees on this rootstock start fruiting in the fourth year. In the garden, they need support at a young age in the form of pegs. In the future, thanks to the strong root system, it does not need support. The trees in the garden reach a height of 4 - 4.5 m. Compatible with all varieties.