Abstract:

Abstract：【Objective】]The aim of this study is to identify the seed-associated fungi of indian lettuce and discuss the correlation between seed-associated fungi and seed igor．【Method】Seed samples of three different sources were collected and storaged , analyzed for seed—associated fungi by washing test and PDA test，meanwhile seed vigor of 3 seeds were evaluated． 【Result】The result indicated :Significant difference of internal and outside fungus quantity and variety had been figured out between 3 seeds with different source. Fusarium sp．. Aspergillus sp，Penicillium sp．,Fusarium sp. Cladosporium sp．were main species of seed associated fungi on seed surface．The mainly isolated fungi inside seeds were Aspergillus sp.， Penicillium sp.， Fusarium sp. ， Pullularia sp..The fungi quantity isolated form the seed by storage 12 months were all fewer than prestoraged, and they had not exist significant difference,but the seed vigor had significant difference(P<0.05).【Conclusion】] Based on the analysis of correlation between fungi quantity isolated from seed and seed vigor,it was presumed that the fungi quantity might have an negative effect on seed vigor．