The morphological characteristics, pathogenicity and biological characteristics of the pathogen isolated from Maryland tobacco in Wufeng County of Hubei Province were studied in the laboratory. After cultivation on LB...The morphological characteristics, pathogenicity and biological characteristics of the pathogen isolated from Maryland tobacco in Wufeng County of Hubei Province were studied in the laboratory. After cultivation on LB medium at 28℃ for48 h, the colonies were light yellow, circular or amorphous, translucent, with smooth and slightly concaved surface and neat edge. Observation under electron microscope showed that the isolates was red-shaped, decapsulated and gram-nega- tive in the size of (0.5 - 1.0) μm × (2.2 -3.0) μm, with 2 -8 flagella. After cultivation on CVP medium at 28 ℃ for 48 h, the colonies were sunken like a cup. The pathogen was able to grow in 5% NaCl medium at 37 ℃, and produced acid through glucose fermentation; it was facuhative anaerobic, and could use citrates, but could not produce indole. It was preliminarily confirmed that the pathogen causing Wufeng Maryland tobacco hollow stalk was Pectobacterium carotovorum subsp. carotovorum.展开更多
In order to further drive the development of comprehensive service cooperatives of tobacco farmers in Maryland Tobacco growing areas,this paper analyzed new situations,new tasks and new problems rising during the impl...In order to further drive the development of comprehensive service cooperatives of tobacco farmers in Maryland Tobacco growing areas,this paper analyzed new situations,new tasks and new problems rising during the implementation of specialized services in mountainous aircured tobacco areas and discussed how to accelerate the construction of specialized service system in Maryland Tobacco growing areas based on the present situation of the specialized service system in Wufeng County.展开更多
基金Supported by Tobacco Research Project of Hubei Tobacco Company(2011-13)Scientific and Technological Project of Yichang City(A2011-201)
文摘The morphological characteristics, pathogenicity and biological characteristics of the pathogen isolated from Maryland tobacco in Wufeng County of Hubei Province were studied in the laboratory. After cultivation on LB medium at 28℃ for48 h, the colonies were light yellow, circular or amorphous, translucent, with smooth and slightly concaved surface and neat edge. Observation under electron microscope showed that the isolates was red-shaped, decapsulated and gram-nega- tive in the size of (0.5 - 1.0) μm × (2.2 -3.0) μm, with 2 -8 flagella. After cultivation on CVP medium at 28 ℃ for 48 h, the colonies were sunken like a cup. The pathogen was able to grow in 5% NaCl medium at 37 ℃, and produced acid through glucose fermentation; it was facuhative anaerobic, and could use citrates, but could not produce indole. It was preliminarily confirmed that the pathogen causing Wufeng Maryland tobacco hollow stalk was Pectobacterium carotovorum subsp. carotovorum.
文摘In order to further drive the development of comprehensive service cooperatives of tobacco farmers in Maryland Tobacco growing areas,this paper analyzed new situations,new tasks and new problems rising during the implementation of specialized services in mountainous aircured tobacco areas and discussed how to accelerate the construction of specialized service system in Maryland Tobacco growing areas based on the present situation of the specialized service system in Wufeng County.