丁布对小麦赤霉病菌和玉米小斑病菌的抑制作用

采用菌丝生长速率法和孢子萌发试验法检测了抗菌化合物丁布对小麦赤霉病菌和玉米小斑病菌的抑菌作用。结果表明,丁布在PDA培养基中浓度为0.2-1.0 mg/ml时对两种供试病菌的菌丝生长无抑制作用;丁布浓度为0.4-1.0 mg/ml时对两种供试病菌孢子悬浮液中孢子的萌发具有显著抑制作用;1.0 mg/ml丁布药液中培育15h的小麦赤霉病菌和培育5h的玉米小斑病菌的孢子萌发抑制率分别达到100%和83.6%。

INHIBITION EFFECT OF DIMBOA ON FUSARIUM GRAMINEARUM AND BIPOLARIS MAYDIS

The Inhibitory effect of DIMBOA (2,4-dihydroxy-7-methoxy-1,4- benzoxazine- 3-one) on Fusarium graminearum and Bipolaris maydis was evaluated by the methods of mycelial growth rate and spore germination.The results showed that DIMBOA had no effect on mycelial growth of the two fungal species on potato dextrose agar containing 0.2-1.0 mg/ml DIMBOA. At the concentrations of 0.4-1.0 mg/ml, DIMBOA significantly restrained the spore germination of Fusarium graminearum and Bipolaris maydis. As the concentration of DIMBOA reached 1.0 mg/ml and the experimental pathogens were incubated 15h and 5h in this chemical solution respectively, the inhibition rates of spore germination were 100% for Fusarium graminearum and 83.6% for Bipolaris maydis.