Conversion of tryptophan to indoleacetic acid by Azospirillum brasilense

Reynders, L.; Vlassak, K.

doi:10.1016/0038-0717(79)90016-6

Cited by 66 publications

(17 citation statements)

References 5 publications

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“…Higher production of total indoles (around fivefold) was observed when the growth-culture-medium was supplemented with Trp, being in agreement with previous reports (Baca et al 1994;Hartmann et al 1983;Pedraza et al 2004;Radwan et al 2002;Reynders and Vlassak 1979). The N-free NFb semisolid medium showed to be suitable for indolic compounds biosynthesis by Azospirillum.…”

Section: Discussionsupporting

confidence: 92%

Natural occurrence of Azospirillum brasilense in strawberry plants

et al. 2007

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Azospirillum species are free-living nitrogen-fixing bacteria commonly found in soil and in association with roots of different plant species. For their capacity to stimulate growth they are known as plant growth-promoting bacteria (PGPB). In this work, we demonstrate the natural occurrence and colonization of different parts of strawberry plants by Azospirillum brasilense in the cropping area of Tucumán, Argentina. Although bacteria isolations were carried out from two strawberry cultivars, e.g., Camarosa and Pájaro, attempts were successful only with the cultivar Camarosa. Whereas different strains of Azospirillum were isolated from the root surface and inner tissues of roots and stolons of the cultivar Camarosa, we have not obtained Azospirillum isolates from the cultivar Pájaro. After microbiological and molecular characterization (ARDRA) we determined that the isolates belonged to the species A. brasilense. All isolates showed to have the capacity to fix nitrogen, to produce siderophores and indoles. Local isolates exhibited different yields of indoles production when growing in N-free NFb semisolid media supplemented or not with tryptophan (0.1 mg ml À1 ). This is the first report on the natural occurrence of A. brasilense in strawberry plants, especially colonizing inner tissues of stolons, as well as roots. The local isolates showed three important characteristics within the PGPB group: N 2 -fixation, siderophores, and indoles production.

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Section: Discussionsupporting

confidence: 92%

Natural occurrence of Azospirillum brasilense in strawberry plants

et al. 2007

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“…Such increase in nodulation and plant growth in these crops was attributed to production of growth-promoting substances by Azospirillum (Gaskins and Hubbell, 1979;Reynders and Vlassak, 1979;Tien et al, 1979). It might have also induced native rhizobia to produce more nodules.…”

Section: Resultsmentioning

confidence: 97%

Effect of Rhizobium andAzospirillum lipoferum inoculation on the nodulation, yield and nitrogen uptake of peanut cultivars

Raverkar

Konde

1988

Plant Soil

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Peanut (Arachis hypogaea Linn.) Cvs. Robut 33-1 and JL 24 were inoculated with Rhizobium strain NC 92 and a strain of Azospirillum lipoferum singly and as mixed inoculum. Seed inoculation with these bacteria enhanced nodulation, N content and yield of these cultivars under field conditions. While a mix inoculation of these two diazotrophic cultures had an adverse effect on these parameters as compare to single inoculation.

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“…brasilense was capable of producing gibberellin and cytokinin-like substances (Tien et al 1979) and also auxins such as IAA when trypthophan was given to the culture (Reynders and Vlassak, 1979;Tien et al, 1979). The production oflAA by A. brasilense is as high as 40 to 84 #g ml ' and the production by A. lipoferum as low as 1.6 to 2.5 #g ml-1 (Hartmann et al, 1983;Jain and Patriquin, 1985).…”

Section: Resultsmentioning

confidence: 97%

“…Several studies have shown that Azospirillum reduces N a (Kapulnik et al, 1985;Nur et al, 1980), and has also the ability to produce plant growth substances such as auxins and cytokinins (Hartmann et al, 1983;Jain and Patriquin, 1985;Reynders and Vlassak, 1979;Tien et al, 1979).…”

Section: Introductionmentioning

confidence: 96%

Acetylene reduction and indoleacetic acid production by Azospirillum isolates from Cactaceous plants

1988

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Azospirillum isolates were obtained from rhizosphere soil and roots of three cactaceae species growing under arid conditions. All Azospirillum isolates from rhizosphere and roots of Stenocereus pruinosus and Stenocereus stellatus were identified as A. brasilense; isolates of surface-sterilized roots from Opuntia ficus-indica were both A. brasilense and A. lipoferum. Azospirilla per g of fresh root in the three species ranged from 70 x 10 3 to 11 • 10 3. The most active strains in terms of C2H2 reduction (25-49.6nmol/h-ml) and indoleacetic acid (IAA) production (36.5-77/~g/ml) were those identified as A. brasilense and isolated from Stenocereus roots. A. lipoferum isolated from Opuntia roots produced low amounts of IAA (6.5-17.5/tg/ml) and low C2H2-reduction activity (17.8-21.2 nmol/h, ml).

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Conversion of tryptophan to indoleacetic acid by Azospirillum brasilense

Cited by 66 publications

References 5 publications

Natural occurrence of Azospirillum brasilense in strawberry plants

Natural occurrence of Azospirillum brasilense in strawberry plants

Effect of Rhizobium andAzospirillum lipoferum inoculation on the nodulation, yield and nitrogen uptake of peanut cultivars

Acetylene reduction and indoleacetic acid production by Azospirillum isolates from Cactaceous plants

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