Exudation-reabsorption in a mycorrhizal fungus, the dynamic interface for interaction with soil and soil microorganisms

Sun, Yu-Ping; Unestam, Torgny; Lucas, Steven; Johanson, Karl J.; Kenne, Lennart; Finlay, Roger D.

doi:10.1007/s005720050298

Cited by 143 publications

(95 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3). This clustering was primarily based on the utilization of 15 of 18 com-pounds, which have previously been postulated to be often present in fungal exudates (28), in the Biolog assay (14,21,24,25,31). The compounds utilized by B. terrae (BS001) were L-arabinose, D-arabitol, ␣-D-glucose, M-inositol, D-mannitol, D-trehalose, citric acid, D-alanine, L-aspartic acid, L-glutamic acid, L-phenylalanine, L-proline, D-serine, L-threonine, and glycerol.…”

Section: Resultsmentioning

confidence: 99%

Migratory Response of Soil Bacteria to Lyophyllum sp. Strain Karsten in Soil Microcosms

Warmink

Elsas

2009

Appl Environ Microbiol

133

178

View full text Add to dashboard Cite

In this study, the selection of bacteria on the basis of their migration via fungal hyphae in soil was investigated in microcosm experiments containing Lyophyllum sp. strain Karsten (DSM2979). One week following inoculation with a bacterial community obtained from soil, selection of a few specific bacterial types was noticed at 30 mm in the growth direction of Lyophyllum sp. strain Karsten in sterile soil. Cultivation-based analyses showed that the migration-proficient types encompassed 10 bacterial groups, as evidenced by (GTG) 5 genomic fingerprinting as well as 16S rRNA gene sequencing. These were (>97% similarity) Burkholderia terrae BS001, Burkholderia sordidicola BS026, Burkholderia sediminicola BS010, and Burkholderia phenazinium BS028; Dyella japonica BS013, BS018, and BS021; "Sphingoterrabacterium pocheensis" BS024; Sphingobacterium daejeonense BS025; and Ralstonia basilensis BS017. Migration as single species was subsequently found for B. terrae BS001, D. japonica BS018 and BS021, and R. basilensis BS017. Typically, migration occurred only when these organisms were introduced at the fungal growth front and only in the direction of hyphal growth. Migration proficiency showed a one-sided correlation with the presence of the hrcR gene, used as a marker for the type III secretion system (TTSS), as all single-strain migrators were equipped with this system and most non-single-strain migrators were not. The presence of the TTSS stood in contrast to the low prevalence of TTSSs within the bacterial community used as an inoculum (<3%). Microscopic examination of B. terrae BS001 in contact with Lyophyllum sp. strain Karsten hyphae revealed the development of a biofilm surrounding the hyphae. Migration-proficient bacteria interacting with Lyophyllum sp. strain Karsten may show complex behavior (biofilm formation) at the fungal tip, leading to their translocation and growth in novel microhabitats in soil.

show abstract

Section: Resultsmentioning

confidence: 99%

Migratory Response of Soil Bacteria to Lyophyllum sp. Strain Karsten in Soil Microcosms

Warmink

Elsas

2009

Appl Environ Microbiol

133

178

View full text Add to dashboard Cite

show abstract

“…Since C availability is limited in marsh sediments (33,54) and AMF act as C sinks within the plantfungus system (21), the presence of AMF could affect C availability in both the rhizosphere and the surrounding bulk soil. Specific rhizosphere microbial populations could be affected by changes in root exudation due to AMF colonization (30), and bulk soil microbial populations could be affected by the reacquisition of excreted substances by the extraradical mycelium (50). The presence of AMF could therefore intensify microbial competition, leading to smaller microbial populations in the rhizosphere.…”

Section: Discussionmentioning

confidence: 99%

Interactions among Plant Species and Microorganisms in Salt Marsh Sediments

Burke

Hamerlynck

Hahn

2002

Appl Environ Microbiol

112

View full text Add to dashboard Cite

The interactions among Spartina patens and sediment microbial populations and the interactions among Phragmites australis and sediment microbial populations were studied at monotypic sites in Piermont Marsh, a salt marsh of the Hudson River north of New York, N.Y., at key times during the growing season. Arbuscular mycorrhizal fungi (AMF) effectively colonized S. patens but not P. australis, and there were seasonal increases and decreases that coincided with plant growth and senescence (17 and 6% of the S. patens root length were colonized, respectively). In sediment samples from the Spartina site, the microbial community and specific bacterial populations were at least twice as large in terms of number and biomass as the microbial community and specific bacterial populations in sediment samples from the Phragmites site, and peak values occurred during reproduction. Members of the domain Bacteria, especially members of the ␣-, ␥-, and ␦-subdivisions of the Proteobacteria, were the most abundant organisms at both sites throughout the growing season. The populations were generally more dynamic in samples from the Spartina site than in samples from the Phragmites site. No differences between the two sites and no differences during the growing season were observed when restriction fragment length polymorphism analyses of nifH amplicons were performed in an attempt to detect shifts in the diversity of nitrogen-fixing bacteria. Differences were observed only in the patterns generated by PCR or reverse transcription-PCR for samples from the Spartina site, suggesting that there were differences in the overall and active populations of nitrogen-fixing bacteria. Regression analyses indicated that there was a positive interaction between members of the ␦-subdivision of the Proteobacteria and root biomass but not between members of the ␦-subdivision of the Proteobacteria and macroorganic matter at both sites. In samples from the Spartina site, there were indications that there were bacterium-fungus interactions since populations of members of the ␣-subdivision of the Proteobacteria were negatively associated with AMF colonization and populations of members of the ␥-subdivision of the Proteobacteria were positively associated with AMF colonization.

show abstract

“…This strategy allows microbes to exploit the diffusion losses of their neighbors and increases the chance of taking up reaction products before they diffuse away from the aggregation of cells. Some mycorrhizal fungi employ this strategy by forming dense, hydrophobic mats of hyphae that exude enzymes in water droplets that are later reabsorbed by the fungus, along with the products of decomposition (Sun et al 1999).…”

Section: Protection Of Investmentmentioning

confidence: 99%

Evolutionary-Economic Principles as Regulators of Soil Enzyme Production and Ecosystem Function

et al. 2010

View full text Add to dashboard Cite

Exudation-reabsorption in a mycorrhizal fungus, the dynamic interface for interaction with soil and soil microorganisms

Cited by 143 publications

References 31 publications

Migratory Response of Soil Bacteria to Lyophyllum sp. Strain Karsten in Soil Microcosms

Migratory Response of Soil Bacteria to Lyophyllum sp. Strain Karsten in Soil Microcosms

Interactions among Plant Species and Microorganisms in Salt Marsh Sediments

Evolutionary-Economic Principles as Regulators of Soil Enzyme Production and Ecosystem Function

Contact Info

Product

Resources

About