Abstract:

Effect of autotoxic substance of Casuarina seedling on endogerous hormones were studied using the method of nutritional culture and regarding root water extract of 15-year casuarina. The results indicated that the content of the growth promoting hormones in leaves and roots of casuarina IAA、GR、iPAs and ZRs decreased under autotoxic substances treatment and the content of decreasing was strengthened with the increasing of concentration of autotoxic substances. And the balance of endogenous hormones were broken and the content of ABA increased as well as ABA/IAA,ABA/GA,ABA/iPAs and ABA/ZRs. Under autotoxic substances treatment, the increment and biomass of roots, items and leaves of casuarina has close relation to the reducing of content of IAA,GR,iPAs and ZRs, increasing of content of ABA and the damage of the balance of endogenous hormones.