ISSN:
1432-072X
Keywords:
Crown-Gall
;
Agrobacterium tumefaciens
;
Phage PS8
;
Tissue Culture
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Asbtract 1. Pseudomonas aureofaciens does not excrete phenazine-α-carboxylic acid, either in a medium with pyruvic acid as sole source of carbon or in a medium with glutamic acid as sole source of carbon, but pigmentation will occur in a medium with glutamic acid _ pyruvic acid as carbon sources. 2. Each of these carbon sources does give rise to phenazine-α-carboxylic acid synthesis in a medium supplemented with 1 mM of the three aromatic amino acids. 3. A mutant strain of Pseudomonas fluorescens var. pseudoiodinum excretes protocatechuic acid and gallic acid in media with pyruvic acid + glutamic acid as carbon sources, but not or very scarcely in media with only one of these two organic acids as sole source of carbon. 4. When supplemented with the three aromatic amino acids, non of the hydroxybenzoic acids could be found in this medium inoculated with this strain. It appears, that the surplus of the aromatic biosynthesis in P. aureofaciens is channeled into phenazine-α-carboxylic acid formation, whereas in P. fluorescens var. pseudoiodinum the enzymes of this pathway are inhibited or repressed if the media are supplemented with the aromatic amino acids.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00403064
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