Abstract: In order to explore the effect of storage time on germination rate of infected seeds treated with dry heat and the activity of pathogenic fungi on infected seeds,and figure out the best condition for storage.In this paper,we used three different infected cucumber seeds as materials.The seeds were storing in 4 ℃ for 1,2,3,6,9 months respectively after treated with dry heat.The seed was evaluated by determining seed germination rate,and the pathogenic activities in the seeds were also evaluated by tablet moisturizing culture method as well as double fluorescence staining.The results indicated that the seed germination rate and the vigor of pathogenic fungi on infected seeds were reduced with the extending of storage time after stored 1,2,3,6,9 months respectively.Seed germination rate was maintain above 88% after 3 months storage and about 80% after 6 months storage when the infected seeds treated 40,60 min under 70 ℃ respectively.However,seed germination rate was below 75% after 3 months storage when the infected seeds treated 90 min under 70 ℃.There was no pathogenic fungi detected and the mortality of the spores on the surface or internal of the infected seed treated with dry heat after stored 3 months.The experiment suggested that the seeds germination rate and the vigor of pathogenic fungi on infected seeds were decreased after storing the dry heat treated infected seeds.When the infected seeds treated 40,60 min under 70 ℃ seeds,germination rate were above 90% and the pathogen had lost its vitality.Therefore these can be used as treatment condition before seed storage.

Key words: Storage time, Dry heat treatment, Infected seeds, Germination rate, Pathogenic vitality

CLC Number: 

• S642.01