Abstract: During germination of Pinus massoniana embryos cultured in vitro, the activity of peroxidase was increased drastically in 10 h and 40 h. The activity of IAA oxidase was decreased drastically in 10 h and 40 h during germination. The experimental results of radioactive isotopes showed: The synthesis rate of protein was evidenthly raised in 5 h and was quickly raised in 15 h ,then the the rate was drastically raised after 40 h. The synthesis rate of RNA was lower before 15 h and was quickly raised in 15 h, then the rate was drastically raised after 30 h. The synthesis rate of DNA was evidenthly raise after 40 h.

Key words: Pinus massoniana embryos culture in vitro