Abstract:

The vigor differences of black locust seeds with different hard degree were studied in this paper.The imbibition seeds soaked into 80 ℃ water and gradually cooled down for different days(1～4 d) were respectively called T₁,T₂, T₃ andT₄. The unimbibed seeds of the forth day were called hard seeds(T_r) which would be soaked with concentrated sulphuric acid for 23 minutes in order to imbibe and germinate.The results showed that as the imbibing time getting long,hard degree of control seeds increasing gradually(T_r>T₄>T₃>T₂ >T₁),the germinating,potential the germination index.,the vigor index and the respirations rate of black locust seeds increased and the conductivity desceased.Research found that the resistance of hard seeds of black locust was higher than that of nor-hard seeds under different stress conditions(salt stress,low temperature,artificial aging),indicating that the hard seeds had potential application value in production.

Key words: Robinia pseudoacacia, hard seed, vigor difference