中文摘要：

从拮抗作用、定殖特性、营养竞争方面研究溶杆菌属（Lysobacter）生防菌06-4对魔芋软腐病的生防机理。结果表明：生防菌06-4对不同致病力魔芋软腐病菌可产生拮抗作用;能在魔芋根部、根际土等生态位点定殖,定殖的量维持在10^2～10^4cfu/g,定殖时间长达32d,表现出良好的环境适应性和稳定性;与魔芋软腐病原菌具有46.88%的营养物质利用相似性,具有一定的营养竞争关系。2007年田间防效测试显示,在对照病情指数为41.20的情况下,生防菌06-4对魔芋软腐病的控制效果达到58.92%。

英文摘要：

Lysobaeter antibioticus strain 06-4 is a potential biocontrol agent against soft rot disease of Amorphophallus konjac root caused by Pectobacterium carotovora subsp, carotovora （Pcc）. Biocontrol mechanism of Lysobacter antibioticus strain 06-4 against Pcc was observed based on antagonism, colonization and nutrition competition. The results indicated that strain 06-4 showed antibacterial activity against Pcc strains with different virulence. It could colonize on the root and the rhizosphere of A.konjac and the organism could maintain 32 d with 10^2-10^4cfu/g. Nutritional requirement experiments showed that the similarity of sole-carbon-source utilization between Pcc and strain 06-4 was 46.88 %, suggesting a nutritional competition between the two microorganisms. Strain 06-4 also significantly reduced the bacterial soft rot index ofA. konjac by 58.92 % in field plot in 2007.