| characterization of a new agrobacterium tumefaciens strain from alfalfa. | agrobacterium tumefaciens strain 1d1609 is reported here as the first field isolate from alfalfa (medicago sativa l.). unlike well-characterized a. tumefaciens strains such as c58 and ach5, strain 1d1609 is highly virulent on alfalfa and has a distinctive host range. interestingly, strain 1d1609 is naturally resistant to kanamycin and spectinomycin. the ti plasmid in strain 1d1609 is an octopine-type; thus, tumors formed by strain 1d1609 synthesize octopine, which is utilized by the bacterium as ... | 1998 | 9560417 |
| isolation of a strain of agrobacterium tumefaciens (rhizobium radiobacter) utilizing methylene urea (ureaformaldehyde) as nitrogen source. | methylene ureas (mu) are slow-release nitrogen fertilizers degraded in soil by microbial enzymatic activity. improved utilization of mu in agricultural production requires more knowledge about the organisms and enzymes responsible for its degradation. a gram-negative, mu-degrading organism was isolated from a soil in sacramento valley, california. the bacterium was identified as agrobacterium tumefaciens (recently also known as rhizobium radiobacter) using both genotypic and phenotypic character ... | 2004 | 15105883 |