In this paper,effects on polyamines content and ethylene production were studied by usingLongchun 10 and Hanxuan 4 seeding isolated leaves as materials treated with─10 MPa PEG solu-tion.The differences between the two species were also compared on the same condition.Leaves from the two species had much stronger capacities in producing ethylene and accumu-lating spermine.Their endogenous polyamine and ethylene levels increased significantly afterstress treatment.Moreover,they rise with the treated time.The c...