Association of Free-Living Nitrogen Fixing Bacteria with Plantroots in Temperate Region

Vlassak, K.; Reynders, L.

doi:10.1007/978-3-642-67034-3_60

Cited by 4 publications

(2 citation statements)

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“…1979); the rates obtained were uniformly low in agreement with published results (Barber et al 1976;Tjepkema and van Berkum 1977;Reynders and Vlassak 1978;Sloger and Owens 1978;Vlassak and Reynders 1978). Inoculation with the Fix-mutant strain SpF 105 did not produce ARA in excised roots, but when strain SpF 104 was used as inoculum some ARA was exhibited by roots of cv.…”

Section: Discussionsupporting

confidence: 92%

Effect of inoculation of Zea mays with Azospirillum brasilense strains under temperate conditions

O’Hara¹,

Davey²,

Lucas³

1981

Can. J. Microbiol.

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Seven strains of Azospirillum brasilense were compared for their effect on the growth of Zea mays grown under temperate conditions in sand--vermiculite pot cultures. Inoculation with all seven strains tested, including Fix(-) mutant strains, increased dry weight and total nitrogen content of shoots, but nitrogen concentrations were unaffected. Low and variable rates of acetylene reduction activity were observed from excised roots of inoculated plants without preincubation. Estimates of N2-fixing A. brasilense associated with inoculated roots showed differences between strains in establishing themselves in the rhizosphere and endorhizosphere. In some strains enrichment in the endorhizosphere of roots occurred following inoculation, but the relative numbers and location of the strains did not appear to affect the yield response.

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Section: Discussionsupporting

confidence: 92%

Effect of inoculation of Zea mays with Azospirillum brasilense strains under temperate conditions

O’Hara¹,

Davey²,

Lucas³

1981

Can. J. Microbiol.

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“…A combination of phenotypic and genetic measures is known to provide a good estimate of soil bacterial diversity (51); however, studies of dominant diazotrophs or plant growthpromoting rhizobacteria associated with maize roots and rhizospheres have been performed only with isolates of Azospirillum spp. (15,52,55,56), Enterobacter cloacae (34), Azotobacter spp. (22), Bacillus circulans, Klebsiella terrigena, Rahnella aquatilis (4), and Burkholderia cepacia (13).…”

Section: Discussionmentioning

confidence: 99%

Comparison ofPaenibacillus azotofixansStrains Isolated from Rhizoplane, Rhizosphere, and Non-Root-Associated Soil from Maize Planted in Two Different Brazilian Soils

Seldin

Rosado

Cruz

et al. 1998

Appl Environ Microbiol

104

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Paenibacillus azotofixans is a nitrogen-fixing bacterium often found in soil and in the rhizospheres of different grasses. In this study, two Brazilian clay soils were planted with cross-hybrid maize (BR-201) and four stages of plant growth were analyzed to characterize the P. azotofixans populations present in the rhizoplanes, rhizospheres, and non-root-associated soils (herein called nonrhizospheres). A total of 106 strains were isolated and identified as P. azotofixans with an API 50CH kit, by classical biochemical tests, and via the use of specific primers based on the 16S rRNA gene in PCRs. To compare the isolated strains, phenotypic characteristics were determined and three different probes were used in hybridization experiments: two nif probes and one probe comprising a 0.58-kb fragment cloned from the P. azotofixans C3L4 genome. These results were used to construct a dendrogram, in which two main clusters could be observed. One cluster contained exclusively strains from Várzea soil, and the other contained the majority of strains from Cerrado soil. The 60 strains from Várzea soil and the 46 strains from Cerrado soil were further analyzed with REP and BOX primers, respectively. Based on the patterns obtained, it was possible to identify 21 different groups among strains from Várzea soil and 4 different groups among strains from Cerrado soil. These different patterns were tested by multivariate analysis of variance, and differences in the populations of P. azotofixans during the four stages of plant growth were demonstrated. Moreover, strains isolated from the rhizoplanes, rhizospheres, and nonrhizospheres of maize planted in Cerrado and Várzea soils were shown to be statistically different; the diversity of P. azotofixans strains was affected by the soil type.

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Wechselbeziehungen zwischen Mikroorganismen und Pflanzen—eine Übersicht

Filip

1979

J Plant Nutrition & Soil

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Relationships behveen microorganism and plants -a reviewRelationships between microorganisms and plants are considered to be an important part of microbial ecology. At present, their study is more concerned with the rhizosphere and less with the phyllosphere. Different microecological aspects of these relationships, furthermore the relationships between individual groups of microorganisms and also biochemical effects of microorganisms on plants are thoroughly examined. Nitrogen fixing bacteria, mycorrhizal fungi and phytopathogenic microorganisms are emphasized because of their particular importance for plant growth. Modem working methods (i.e. scanningelectron microscopy, radiometry, gas chromatography, etc.) are widely used. For a closer examination of very complex problems, the micro-organisms-plants relationships should be consequently considered to be a part of an open ecological system with mostly continual nutrient cycling.

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Association of Free-Living Nitrogen Fixing Bacteria with Plantroots in Temperate Region

Cited by 4 publications

References 1 publication

Effect of inoculation of Zea mays with Azospirillum brasilense strains under temperate conditions

Effect of inoculation of Zea mays with Azospirillum brasilense strains under temperate conditions

Comparison ofPaenibacillus azotofixansStrains Isolated from Rhizoplane, Rhizosphere, and Non-Root-Associated Soil from Maize Planted in Two Different Brazilian Soils

Wechselbeziehungen zwischen Mikroorganismen und Pflanzen—eine Übersicht

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