Survival of two ecologically distinct bacteria (Flavobacterium and arthrobacter) in unplanted and rhizosphere soil: Field studies

Thompson, Ian P.; Young, Caroline; Cook, K. A.; Lethbridge, G.; Burns, Richard G.

doi:10.1016/0038-0717(92)90235-p

Cited by 34 publications

(10 citation statements)

References 18 publications

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“…Nevertheless, the spectrum of physiological traits and lifestyles within a defined phylum can still be rather diverse (Goldfarb et al ., ). Arthrobacter for example was originally reported to be oligotrophic (Thompson et al ., ) but has been repeatedly identified in SIP studies to consume labile sugars in soils (Mau et al ., ; Kramer et al ., ). Also in our study, this taxon was highly 13 C‐enriched in the subsoil U.…”

Section: Discussionmentioning

confidence: 99%

“…A putative producer of glycoside hydrolases in the subsoil L rhizosphere may be Flavobacterium . Bacteria of this genus are copiotrophs, living on easy available substrates and were found to induce hydrolase activities in the wheat rhizosphere in former studies (Thompson et al ., ; Mawdsley and Burns, ; Heijnen et al ., ). Furthermore, at the early plant vegetative growth phase – as in our study – Flavobacterium is more abundant whereas Sphingobacteria take over at later plant developmental stages (Donn et al ., ).…”

Section: Discussionmentioning

confidence: 99%

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Bacteria utilizing plant‐derived carbon in the rhizosphere of Triticum aestivum change in different depths of an arable soil

Uksa

Buegger

Gschwendtner

et al. 2017

Environ Microbiol Rep

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Root exudates shape microbial communities at the plant-soil interface. Here we compared bacterial communities that utilize plant-derived carbon in the rhizosphere of wheat in different soil depths, including topsoil, as well as two subsoil layers up to 1 m depth. The experiment was performed in a greenhouse using soil monoliths with intact soil structure taken from an agricultural field. To identify bacteria utilizing plant-derived carbon, C-CO labelling of plants was performed for two weeks at the EC50 stage, followed by isopycnic density gradient centrifugation of extracted DNA from the rhizosphere combined with 16S rRNA gene-based amplicon sequencing. Our findings suggest substantially different bacterial key players and interaction mechanisms between plants and bacteria utilizing plant-derived carbon in the rhizosphere of subsoils and topsoil. Among the three soil depths, clear differences were found in C enrichment pattern across abundant operational taxonomic units (OTUs). Whereas, OTUs linked to Proteobacteria were enriched in C mainly in the topsoil, in both subsoil layers OTUs related to Cohnella, Paenibacillus, Flavobacterium showed a clear C signal, indicating an important, so far overseen role of Firmicutes and Bacteriodetes in the subsoil rhizosphere.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Bacteria utilizing plant‐derived carbon in the rhizosphere of Triticum aestivum change in different depths of an arable soil

Uksa

Buegger

Gschwendtner

et al. 2017

Environ Microbiol Rep

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“…Although the majority of the current literature relates to studies of soil microbial communities, most if not all of the techniques may be applied to the study of endophytic bacteria. Recently developed methods include the use of serology (Campbell, 1993;Bohlool and Schmidt, 1973;Hoff, 1993), bioluminescence markers (deWeger et al, 1991;Heitzer et al, 1992;O'Kane et al, 1988), antibiotic resistance markers derived from spontaneous mutation (Carlton and Brown, 1983;Compeau et al, 1988;Thompson et al, 1992), or through the use of molecular markers to label characteristic metabolic enzymes (Sharma and Signer, 1990). For example, the absence of hydrolytic enzyme betaglucuronidase (GUS) activity in most plants makes it a very specific marker in studying plant-microbe interactions Sessitsch et al, 1997).…”

Section: Monitoring Microbial Communitiesmentioning

confidence: 99%

Bacterial Endophytes: Potential Role in Developing Sustainable Systems of Crop Production

Sturz

Christie

Nowak

2000

Critical Reviews in Plant Sciences

487

253

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“…The results from colony counts showed that the introduced pseudomonad declined progressively to low CFUs in surface soil. However, the ecology of pseudomonads in the rhizosphere and in soil are different and it could be that the introduced strain persisted better in the vicinity of plant roots than in soil, as shown with other bacteria [15]. From a biosafety point of view, the possibility that bacteria associated with plant roots could persist in the environment we!!…”

mentioning

confidence: 99%

Autecology of the biocontrol strain Pseudomonas fluorescens CHA0 in the rhizosphere and inside roots at later stages of plant development

Troxler

Zala

Natsch

et al. 2006

FEMS Microbiology Ecology

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A spontaneous rifampicin-resistant mutant of the biocontrol agent Pseudomonas fluorescens CHAO was released as soil inoculant in large outdoor lysimeters and its ability to colonise the roots of winter wheat, spring wheat (grown after Phacelia) and maize at the later stages of plant development was investigated by colony counts. The inoculant (i.e. CHAO-Rif) colonised the rhizosphere and the interior of the roots of both wheat varieties but CFUs at ripening were about 2 log (g root)-or lower. In contrast, the roots of maize were colonised poorly by the pseudomonad at flowering, but the latter was found at 3 or more log CFU (g root)-' on and inside the roots in late ripening stage. Furthermore, CHAO-Rif was recovered at more than 5 log CFU (g root)-' from the interior of several maize root samples. Whereas most cells of CHAO-Rif in soil were small and did not respond to Kogure's viability test, the pseudomonad was present as viable, unusually large (7 mm long) rods inside maize roots. In a microcosm experiment performed with similar sandy-loam soil, the GFUs of maize root-associated CHAO-Rif were higher where the shoots of the plan: had been cut off, confirming that older and/or decaying =size roois represent a favourrib:e niche for the inoculant. Overall, the results indicate that Pseudomonus inoculants have the potential to colonise the roots of certain crops (e.g. maize but not wheat for strain CHAO-Rif) at later stages of plant development.

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Survival of two ecologically distinct bacteria (Flavobacterium and arthrobacter) in unplanted and rhizosphere soil: Field studies

Cited by 34 publications

References 18 publications

Bacteria utilizing plant‐derived carbon in the rhizosphere of Triticum aestivum change in different depths of an arable soil

Bacteria utilizing plant‐derived carbon in the rhizosphere of Triticum aestivum change in different depths of an arable soil

Bacterial Endophytes: Potential Role in Developing Sustainable Systems of Crop Production

Autecology of the biocontrol strain Pseudomonas fluorescens CHA0 in the rhizosphere and inside roots at later stages of plant development

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