Characterization of nonattaching mutants of Agrobacterium tumefaciens
نویسندگان
چکیده
منابع مشابه
Biochemical characterization of avirulent exoC mutants of Agrobacterium tumefaciens.
The synthesis of periplasmic beta(1-2)glucan is required for crown gall tumor formation by Agrobacterium tumefaciens and for effective nodulation of alfalfa by Rhizobium meliloti. The exoC (pscA) gene is required for this synthesis by both bacteria as well as for the synthesis of capsular polysaccharide and normal lipopolysaccharide. We tested the possibility that the pleiotropic ExoC phenotype...
متن کاملIsolation of morphological mutants of Agrobacterium tumefaciens.
Morphological mutants were isolated from a wild strain of Agrobacterium tumefaciens at a high frequency by treatment with a nitrosoguanidine. Seventeen of the 20 mutants isolated were temperature-sensitive. At 27 C, the mutant cells were rod-shaped and at 37 C, spherical or branched, whereas the wild-type cells were rod-shaped at both temperatures.
متن کاملMutants of Agrobacterium tumefaciens with elevated vir gene expression.
Expression of Agrobacterium tumefaciens virulence (vir) genes requires virA, virG, and a plant-derived inducing compound such as acetosyringone. To identify the critical functional domains of virA and virG, a mutational approach was used. Agrobacterium A136 harboring plasmid pGP159, which contains virA, virG, and a reporter virB:lacZ gene fusion, was mutagenized with UV light or nitrosoguanidin...
متن کاملAgrobacterium tumefaciens mutants affected in attachment to plant cells.
An analysis of Agrobacterium tumefaciens mutants with Tn5 insertions in chromosomal DNA showed that the chromosome of A. tumefaciens codes for a specific ability of this bacterium to attach to plant cells. This ability is associated with tumorigenesis by A. tumefaciens, the ability of avirulent A. tumefaciens to inhibit tumorigenesis, and the ability to adsorb certain phages. A second class of ...
متن کاملCharacterization of the mmsAB-araD1 (gguABC) genes of Agrobacterium tumefaciens.
The chvE-gguABC operon plays a critical role in both virulence and sugar utilization through the activities of the periplasmic ChvE protein, which binds to a variety of sugars. The roles of the GguA, GguB, and GguC are not known. While GguA and GguB are homologous to bacterial ABC transporters, earlier genetic analysis indicated that they were not necessary for utilization of sugars as the sole...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1987
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.169.1.313-323.1987