Abstract: The soluble proteins of hybrid larch (Larix olyensis× Larix kaempferi) during cutting ro-otings were analysed by SDS polyacrylamide electrophoresis (SDS-PAGE). From the SDS-PAGE result, we can infer that three kind of proteins (24 KD, 26 KD, 39 KD) are connected with generation and differentiation of root primordium; The protein with 28 KD molecular weight has an ability to promote the root primordium growing and generating adventitious roots; The protein with 47 KD molecular weight inhibits the generation of root primordium or the growth of adventitious roots.

Key words: hybrid larch, cutting, soluble proteins