铝对不同种源喜树种子萌发特性的影响

he effect of aluminum treatment on germination of three provenance seeds of Camptotheca acuminate Decne was studied. The result was that the sequence of seed germinationability of three provenances was Kunming> Guiyang> Nanjing and the seed germination rate was respectivly 96.67%, 58.67% and 29.3%. The sensitivity and tolerance to Al stress of three provenances were different. The seed germinationability of Kunming provenance was restrained under three concentrations of Al treatment (2000mg/L，3500 mg/L，5000 mg/L of AlCl3.6H2O) ,but the germination rate and potential of Nanjing and Guiyang provenance seeds were obviously increased. Although the seed germinationability of Guiyang provenance was obviously promoted at 2000 mg/L,the length of radicel of three provenances respectivly decined 68.2% , 54.5% and 38.9% and the vigor index respectivly decined 71.1%, 50.0% and 22.4% at 5000 mg/L. The relative radicel conductivity of three provenances increased and root tips were blacked and brown under 3500~5000mg/Lof Al treatment .The quality of seed germination was affected.