玉米青枯病生防细菌的筛选

从自然界分离到细菌菌株1 193株,通过对峙培养筛选出5株对玉米青枯病病原菌(禾谷镰刀菌、禾生腐霉、肿囊腐霉)具有强抑制作用的拮抗菌,抑菌圈直径达到6~16 mm。温室盆栽试验结果表明,当接种病原菌为禾谷镰刀菌时,生防菌G28-6、K11-9、K18-5的防治效果都达到66%以上;当病原菌为禾生腐霉菌时,生防菌K3-3的防治效果达到54.29%;当病原菌为肿囊腐霉时,生防菌K18-5的防治效果为35.71%。生防菌还对玉米根的生长有显著促进作用。另外,生防菌G28-6和K18-5在玉米根部有较强的定殖能力,具有研制生防制剂的潜力。

Screening of Biocontrol Bacteria against Corn Stalk Rot

Five biocontrol bacteria strains against pathogens of corn stalk rot were selected from1193 bacteria strains,and the inhibition zone width can reach to 6-16mm.Greenhouse pot experiments showed that the control effect of biocontrol bacteria G28-6 as well as K11-9 and K18-5 against Fusarium graminearum was more than 66 percent,the control effect of biocontrol bacteria K3-3 against Pythium graminicol is 54.29 percent,and the control effect of biocontrol bacteria K18-5 against Pythium inflatum is 35.71 percent.The biocontrol bacteria played an important role in promoting the growth of corn roots.Besides,the biocontrol bacteria G28-6 and K18-5 showed strong colonization ability in rhizosphere of corn,suggesting the potential to be developed as biocontrol agents.