Abstract: Dwariin}g stocks of SH series apples are clorsal scion-rooted apple stocks crossed between Ralls and M.honaneas Controls are M₉,M₇,MM₁₀₆ clonal scion-rooted stocks and M.bacara seeding stocks.Craft varieties are Yu Hong(No.3 Starking),Golden Decicious,Fuji,etc.They were ccossad in 1978,and established in the autumn of 1982.After 5 consoecutive years' observation on biologcal traits,phenological phases and horticaitural characters as well as analysix and determination on nutrition,net photosyntheric efficiency,stomatic resistance,transpiration intensity and ABA content,a series of SH apple dwarfing stocks have been selected from 4100 stock hybrid single strains.The present paper reports SH₃,SH₄,SH₆,SH₉,SH₁₂,SH₁₄,SH₁₅,SH₂₀,SH₂₁,SH₂₉ten outstanding superior stocks from the SH series,Their common characters are early-flowering and early-fruiting,with dwarfing or semi-dwarfing trunks,stress-resistant(drought-resistant,lodging resistant,bolring-resistant),early stable high-yeilding,brightted frult coloring,high quality and rich flavor,high content of solid matter,had fruits suitable for storage,and easy to propagate.Their comprehensive characters sur-pass those of control,that is,new series apple dearing stock of M₉,M₇,MM₁₀₆and M.baccata.

Key words: Apple dwarfing stock, Clonal scionat stock, Breeding