Seed

Apple :
malus domestica Antonovka  Popular rootstock for standards. Makes commercial sized apples usually.
malus prunifolia (plum leaf apple) Even more cold hardy than Antonovka. Very fibrous root system. Vigorous.
malus baccata (siberian crabapple) Extremely cold hardy, to zone 2
 
Pear :
pyrus communis (bartlett )
pyrus ussuriensis (Harbin pear)  A wild Manchurian pear. Has some fireblight resistance.

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Showing all 3 results