Water Extract of Alnus nepalensis D.Don. to the Seeds Germination of Pinus yunnanensis Faranch Effects of Physiological and Biochemical Mechanism

Study effect of different concentrations (1◇10,1◇50,1◇100,1◇200)water extract from Alnus nepalensis D.Don on the seed germination and allelopathic physiology and biochemistry characteristics effects of Pinus yunnanensis Faranch. Pre-test tube method was used with qualitative analysis of organic components of water extract from A.nepalensis D.Don. Results showed that water extract of A. nepalensis D.Don contains amino acids and proteins, organic acids, sugars, and phenolic compounds, without alkaloids and tannin compounds.Seed germination capacity, respiratory rate, α-amylase and protease activity were significantly inhibited in high concentrations after seeds were treated by water extract, with the concentration of water extract decreased, the effect of inhibition became weakening, even changing to promote.