Symbiotically defective histidine auxotrophs of Bradyrhizobium japonicum

Sadowsky, Michael J.; Rostas, Katalin; Sista, Prakash; Bussey, Howard; Verma, Desh Pal S.

doi:10.1007/bf00409881

Cited by 26 publications

(16 citation statements)

References 16 publications

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“…Bacteroids depend on the plant host not only for the source of energy but also for other nutrients, microelements and vitamins, although the supply of some nutrients is probably not sufficient. Some auxotrophic rhizobia form ineffective nodules, but the symbiosis may be restored by adding some essential vitamins or aminoacids to the medium (Sadowsky et al, 1986;Schwinghamer, 1970).…”

Section: Discussionmentioning

confidence: 99%

Enhancement of symbiotic nitrogen fixation by vitamin-secreting fluorescent Pseudomonas

Deryło

Skorupska

1993

Plant Soil

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Fluorescent Pseudomonas sp. strain 267 promotes growth of nodulated clover plants under gnotobiotic conditions. In the growth conditions (60 g M FeC13), the production of siderophores of the pseudobactin-pyoverdin group was repressed. Plant growth enhancement results from secretion of B vitamins by Pseudomonas sp. strain 267. This was proven by stimulation of clover growth by naturally auxotrophic strains of Rhizobium leguminosarum bv. trifolii and marker strains E. coli thi-and R. meliloti pan-in the presence of the supernatant of Pseudomonas sp. strain 267. The addition of vitamins to the plant medium increased symbiotic nitrogen fixation by the clover plants.

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Section: Discussionmentioning

confidence: 99%

Enhancement of symbiotic nitrogen fixation by vitamin-secreting fluorescent Pseudomonas

Deryło

Skorupska

1993

Plant Soil

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“…Fedorov and Simarov 74 studied the nitrogenase activity of 44 mutants of S. meliloti strains SHM1 and L5-30 as well as 22 spontaneous prototrophic revertants of mutants having no nitrogen fi xation activity. Sadowsky et al(1986) 36 found that out of four histidine auxotrophs of B. japonicum strain USDA122, two were symbiotically defective and did not form nodules on Glycine max and on Glycine soja, and other two mutants were symbiotically competent while prototrophic revertants formed nodules on all the soybean cultivars examined. Symbiotically defective auxotrophic mutants of R. fredii HH303 isolated by Kim et al(1988) 37 induced nodulation on soybean, but the symbiotic effectiveness of each mutant was different.…”

Section: Effect Of Auxotrophy On Symbiotic Processmentioning

confidence: 99%

Auxotrophy in rhizobia revisited

Yadav

2007

Indian J Microbiol

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Among the various types of mutations studied in rhizobia, the auxotrophic mutations (which confer on the mutants the inability to synthesize certain essential substances such as amino acids, vitamins and nucleic acids), are the most favoured ones as these can be used as suitable markers for genetic analysis. An important property of rhizobia is their effectiveness i.e. their ability to fi x atmospheric nitrogen into ammonia within the nodule. Special interest in this category of mutations by rhizobial geneticists is due to the fact that there is a strong correlation between the metabolic defects and the ineffectiveness (Nod -and/or Fix -) of the rhizobial strains. Auxotrophic mutants of various species of rhizobia with defects in the synthesis of nucleic bases, vitamins and amino acids have been obtained by mutagenising with physical, chemical and Tn5 mutagens. These mutants have been used in mapping studies as well as in establishing a correlation between its metabolic requirement and symbiotic relationship with the host plant. The present review deals with the isolation of auxotrophs, and their genetic, biochemical and symbiotic characterization. The review also encompasses the studies on the elucidation of biosynthetic pathways of nutritional substances in rhizobia.

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“…Numerous studies have also found that certain amino acid pathway mutations affect ability to fix nitrogen sym biotically, although these symbiotic effects vary (10,95,97,154,158). Numerous studies have also found that certain amino acid pathway mutations affect ability to fix nitrogen sym biotically, although these symbiotic effects vary (10,95,97,154,158).…”

Section: Metabolic Genesmentioning

confidence: 99%

RHIZOBIUM GENETICS

Long

1989

Annu. Rev. Genet.

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Symbiotically defective histidine auxotrophs of Bradyrhizobium japonicum

Cited by 26 publications

References 16 publications

Enhancement of symbiotic nitrogen fixation by vitamin-secreting fluorescent Pseudomonas

Enhancement of symbiotic nitrogen fixation by vitamin-secreting fluorescent Pseudomonas

Auxotrophy in rhizobia revisited

RHIZOBIUM GENETICS

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