The Biological Characteristics of Radish Alternaria and the Screening of the Medium

The bacterial strain with the largest sporulation quantity was chosen from the 12 Alternaria sp.bacterial strains and the optimal medium was selected from 8 media including PDA medium,PSA medium,beef extract peptone medium,YPD medium,flour medium,bean sprouts medium,corn medium,almond medium.The influence of temperature,light,treatment time on sporulation of Alternaria sp.were studied.The results showed that JZHB7Alternaria had the largest sporulation quantity.Bean sprouts medium was the best medium among the eight kinds of media,JZHB7Alternaria spores germination reached the maximum at 15 ℃ and the minimum at 0 ℃.JZHB7Alternaria strains grew fast from 4 d to 7 d and slow from the 10 d to 13 d.Sporulation quantity of JZHB7Alternaria increased in 2 h and decreased in 24 h.