摘要
柑桔溃疡病是中国柑桔的重要病害。从南宁柑桔园土壤中分离到1株对柑桔溃疡病菌具有强抑制力的细菌Bt8。根据Bt8菌株的形态1、6S rDNA序列分析以及生理生化特性,将其鉴定为鲍氏不动杆菌。Bt8菌株的抑菌效果受温度、pH及培养基等环境因素的影响。在温室条件下将该细菌悬浮液喷施到柑桔叶片上,获得了55.2%的病斑抑制效果。研究结果揭示了鲍氏不动杆菌在柑桔溃疡病田间防治上的潜能。
Citrus bacterial canker is an important disease of Citrus species in China. The disease severely occurs especially in the coastal area. Integrated control system has been used for the control of the disease, in which chemotherapy plays an important role at present. The chemotherapy-dominant control system brought many problems to the environment, such as chemical residua in the products and induction of resistance to fungicide（s） by the pathogen. To solve these problems, an intensive study on biocontrol of citrus bacterial canker is needed. Isolations and characterizations of biocontrol agents are the basis for biocontrol of the disease. A bacterial strain Bt8 with strong inhibiting ability against Xanthomonas axonopodis pv. citri （Hasse） Vauterin, was isolated from citrus orchard soil in Nanning, China. The isolated bacterial strain was identified and characterized as Acinetobacter baumannii Bouvet et Grimont on the base of its morphology and 16S rDNA sequence analysis as well as physiological and biochemical characters. The inhibiting activity of the bacterium suspension against the pathogen was significantly influenced by environmental factors, such as temperatures, pHs and media. At temperatures of 18℃ to 33℃, both the inhibiting activity of the bacterium suspension and the biomass of the bacterium increased with the increases of temperatures, suggesting that the influence of temperature on inhibiting activity of the bacterium suspension was in dependence on the bacterial biomass. In NA liquid medium of pH 10, the bacterium suspension showed the .highest inhibiting activity against Xanthomonas axonopodis pv. citri, which was not in dependence on biomass of the bacterium. The bacterium suspension provided 55.2% inhibition against bacterial canker under greenhouse conditions. The results showed that Acinetobacter baumannii has potential as biocontrol agent against bacterial canker disease. Acinetobacter baumannii was reported as the pathogens infecting human and animals.The present study enriched the understanding on biological diversity in Acinetobacter baumannii to sciences.This is the first report on the isolation of Acinetobacter baumannii with strong inhibiting ability against plant pathogen.
出处
《微生物学报》
CAS
CSCD
北大核心
2006年第2期292-296,共5页
Acta Microbiologica Sinica
基金
广西科技攻关项目(桂科攻0322003B)~~
