Wheat Root Tips as a Vector for Passive Vertical Transfer of Azospirillum brasilense Cd

Bashan, Yoav; Levanony, Hanna

doi:10.1099/00221287-135-11-2899

Cited by 8 publications

(10 citation statements)

References 10 publications

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“…Nevertheless, Pseudomonas strains r2r, erl2r and esNr were numerous in the distal third but not in the middle third of one of the replicate plants. This pattern of colonization is consistent with the view that bacteria are transported with the growing root tip, as observed by Elad and Chet (1987) and Bashan and Levanony (1989). However, such transport occurs infrequently and perhaps only with certain bacteria.…”

Section: Discussionsupporting

confidence: 76%

“…The bacteria inoculated on seeds in this study remained primarily in the upper region of the rhizosphere. Similar results have been reported by Chao et al (1986) and Bahme and Schroth (1987), but seed-inoculated bacteria sometimes develop throughout the rhizosphere (Bashan and Levanony, 1989;Kloepper et al, 1980). To determine whether a factor other than movement from the seed limited colonization of distal sections of the rhizosphere, bacteria were inoculated throughout the soil, and their subsequent location in the rhizosphere was determined.…”

Section: Discussionmentioning

confidence: 53%

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Relationship between the number of bacteria added to soil or seeds and their abundance and distribution in the rhizosphere of alfalfa

Hatzinger

Alexander

1994

Plant Soil

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A study was conducted of the relationship between the density of several bacterial strains introduced into soil or onto seeds and their abundance in the rhizosphere of alfalfa. The abundance of six species in the rhizosphere was directly correlated with the density of bacteria initially added to soil. The density of six species in the rhizosphere of 15-day-old plants also was directly correlated with the density of each strain in nonrhizosphere soil. Tests of seven species added to soil at four inoculum densities showed that bacteria that survived well in the soil attained the highest densities in the rhizosphere and those that survived poorly in the soil were present at the lowest densities in the rhizosphere. Sixteen of 19 bacterial strains added to alfalfa seeds at lo7 or 10' cells per g colonized the rhizosphere of 15-day-old plants, but nearly all of the cells were localized in the upper third of the rhizosphere. A study of 12 bacterial strains that failed to colonize the lower part of the rhizosphere if inoculated onto seeds showed that the bacteria colonized the entire rhizosphere of U-day-old alfalfa plants if initially inoculated throughout the soil. The data suggest that the density of individual bacterial strains in the rhizosphere is dependent on their density in the soil and that seed inoculation only has an effect on the population in the proximal portion of the alfalfa root system.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 53%

Relationship between the number of bacteria added to soil or seeds and their abundance and distribution in the rhizosphere of alfalfa

Hatzinger

Alexander

1994

Plant Soil

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“…The bacterial density per gram of plant tissue was *100 times higher for bacteria isolated from inner tissues of roots than those present in the first stolon; and the fact that we could not isolate Azospirillum from the third stolon in the cultivar Camarosa, may be due to the ratio of stolons growth rate versus velocity of bacterial translocation through inner tissues. In this context, we should assume that the stolon growth rate is higher than the bacterial translocation rate, although some earlier information about transportation of Azospirillum in growing roots (not stolons) showed that Azospirillum translocates faster than wheat growing roots, irrespective of the root growth rate (Bashan and Levanony 1989).…”

Section: Discussionmentioning

confidence: 99%

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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“…Analysis of the results indicates that all of our test bacteria were able to colonize and grow throughout a developing wheat rhizosphere, but to di¡erent extents. Di¡erences in colonization probably resulted from di¡erences in bacterial species ability to adhere to the root tip, utilize plant exudates and/or a lack of motility [41,42]. However, addition of live nematodes to our system substantially increased the degree of colonization for all test bacteria.…”

Section: Discussionmentioning

confidence: 99%

Nematode-enhanced microbial colonization of the wheat rhizosphere

Knox

Killham

Mullins

et al. 2003

FEMS Microbiology Letters

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The mechanisms by which seed-applied bacteria colonize the rhizosphere in the absence of percolating water are poorly understood. Without mass flow, transport of bacteria by growing roots or soil animals, particularly nematodes may be important. We used a sandbased microcosm system to investigate the ability of three species of nematodes (Caenorhabditis elegans, Acrobeloides thornei and a Cruznema sp.) to promote rhizosphere colonization by four strains of beneficial rhizobacteria. In nearly all cases, rhizosphere colonization was substantially increased by the presence of nematodes, irrespective of bacterial or nematode species. Our results suggest that nematodes are important vectors for bacteria rhizosphere colonization in the absence of percolating water.

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Wheat Root Tips as a Vector for Passive Vertical Transfer of Azospirillum brasilense Cd

Cited by 8 publications

References 10 publications

Relationship between the number of bacteria added to soil or seeds and their abundance and distribution in the rhizosphere of alfalfa

Relationship between the number of bacteria added to soil or seeds and their abundance and distribution in the rhizosphere of alfalfa

Natural occurrence of Azospirillum brasilense in strawberry plants

Nematode-enhanced microbial colonization of the wheat rhizosphere

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