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• W2014238575 abstract "Pseudomonas putida GR12-2R3 is a rifampicin-resistant derivative of a cold-tolerant, nitrogen-fixing bacterium isolated from the roots of grasses growing in the Canadian high arctic. It colonizes canola (Brassica campestris) roots and promotes canola root and shoot growth under gnotobiotic conditions and in the field. TnphoA insertion mutagenesis was used to isolate derivatives of strain GR12-2R3 that had reduced abilities to promote canola root elongation (PRE − mutants). Within a pool of 10 290 TnphoA insertion mutants, 1.4% expressed active PhoA fusion proteins (PhoA + ). Among 20 PhoA + mutants, 6 were PRE − and 4 of those strains secreted PhoA activity into the culture medium. PhoA + strain PG269 showed PhoA activity, 25% cell associated, that was induced by canola seed exudate. The ability of this strain to promote canola root elongation was similar to that of the parent strain. Like other pseudomonads, strain GR12-2R3 utilizes a wide range of sugars, amino acids, and other compounds as carbon and nitrogen sources. Twenty-one TnphoA insertion mutants, all PhoA − , were unable to utilize a specific nutrient. That group included strains that could not utilize arabinose (Ara − , three mutants) or glycerol and other compounds (Csu − , three mutants) as carbon source and strains that could not utilize glycine (Gut − , eight mutants), histidine (Hut − , three mutants), or proline (Put − , four mutants) as nitrogen source. One Ara − mutant, three Gut − mutants, and one Csu − mutant were PRE − . Five of the mutant strains examined in detail (two PhoA − PRE − , one PhoA − PRE + , one PhoA + PRE − , and one PhoA + PRE + ) grew less well than strain GR12-2R3 in LB and (or) seed exudate medium. Further characterization of the TnphoA target genes in selected PRE − strains is expected to yield additional insight regarding the molecular basis for the interaction between P. putida GR12-2R3 and canola.Key words: Pseudomonas putida, plant growth promoting rhizobacterium, TnphoA." @default.
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• W2014238575 title "Mutant derivatives of <i>Pseudomonas putida</i> GR12-2R3 defective in nutrient utilization or cell surface structures show reduced ability to promote canola root elongation" @default.
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• W2014238575 doi "https://doi.org/10.1139/m93-168" @default.
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