Are root exudates more important than other sources of rhizodeposits in structuring rhizosphere bacterial communities?

By P. Dennis, Anthony J. Miller, P. Hirsch. FEMS Microbiology Ecology, 2010

936 citations recorded by the source corpus.

This review evaluates the importance of root exudates in determining rhizosphere bacterial community structure. We present evidence that indicates that: (1) the direct influence of root exudates on rhizosphere bacterial communities is limited to small spatiotemporal windows related to root apices; (2) upon rapid assimilation by microorganisms, root exudates are modified, independent of plant influences, before rerelease into the rhizosphere by the microorganisms themselves--thus, at short distances from root apices, rhizosphere carbon pools are unlikely to be dominated by root exudates; and (3) many of the major compounds found in root exudates are ubiquitous in the rhizosphere as they are found in other pools of rhizodeposits and in microbial exudates. Following this argument, we suggest that the importance of root exudates in structuring rhizosphere bacterial communities needs to be considered in the context of the wider contribution of other rhizosphere carbon pools. Finally, we discuss the implications of rhizosphere bacterial distribution trends for the development of effective strategies to manage beneficial plant-microorganism interactions.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/65142603ae493797c1412e2415269b1d18437bde

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Citations in the corpus

Rhizosphere-associated bacterial network structure and spatial distribution differ significantly from bulk soil in wheat crop fields (2017, background): “, 2012), with the ultimate benefit of attracting and promoting beneficial microorganisms that can improve nutrient acquisition and combat pathogenic taxa (Dennis et al., 2010).”
The Interactions of Rhizodeposits with Plant Growth-Promoting Rhizobacteria in the Rhizosphere: A Review (2019, background): “[74] reported that border cells themselves are part of rhizodeposits like exudates that are released from the root cap cells.”
Soil sickness of peanuts is attributable to modifications in soil microbes induced by peanut root exudates rather than to direct allelopathy (2014, background): “The excreted compounds in the root exudates play an important role in carbon flux into soil, a process also called rhizodeposition (Dennis et al., 2010).”
The Role of Soil Microorganisms in Plant Mineral Nutrition—Current Knowledge and Future Directions (2017, background): “Data about the amount of rhizodeposition range between 5 and 30% of the total amount of fixed carbon (Bekku et al., 1997; Hütsch et al., 2002; Dennis et al., 2010), which generally means a large loss of reduced-C Frontiers in Plant Science | www.frontiersin.org 4 September 2017 | Volume 8 | Article…”
Microbial control over carbon cycling in soil (2012, background): “…for discrete and reproducible communities, based on both the chemical nature of plant rhizodeposits (Paterson et al., 2007; DeAngelis et al., 2009; Dennis et al., 2010) and the physical environment created by roots (e.g., altered O2, pH, and water availability; da Rocha et al., 2009; Hinsinger et…”
Acquisition of phosphorus and other poorly mobile nutrients by roots. Where do plant nutrition models fail? (2011, background): “Moreover, such models should account for microbial dynamics along roots, when attempting to upscale such processes at the whole plant scale, building up on the conceptual framework developed by Dennis et al. (2010).”
Increase in microbial biomass and phosphorus availability in the rhizosphere of intercropped cereal and legumes under field conditions (2014, background): “The increase in microbial growth as a consequence of the rhizodeposition of C compounds, commonly called the rhizosphere effect, is a well-documented process (Carpenter-Boggs et al., 1998; Paterson, 2003; Dennis et al., 2010).”
Functional genomics analysis of plant growth-promoting rhizobacterial traits involved in rhizosphere competence (2011, background): “In the rhizosphere, the nutrient present in exudates may not be available for PGPR due to competition with others species (Dennis et al. 2010).”
The plant microbiome (2013, background): “The sloughing of root cells and the release of mucilage deposits a large amount of material into the rhizosphere, including plant cell wall polymers such as cellulose and pectin [45].”
Rhizospheric organic compounds in the soil–microorganism–plant system: their role in iron availability (2014, background): “© 2014 British Society of Soil Science, European Journal of Soil Science, 65, 629–642 Microbe-plant association and plant mineral nutrition Dennis et al. (2010) provide a detailed description of types and amounts of root exudates and define them in terms of stimulatory (carbon sources, mostly sugar…”
Comparison on the structure and function of the rhizosphere microbial community between healthy and root-rot Panax notoginseng (2016, background): “, 2004), and also by biotic factors, such as root exudates (Dennis et al., 2010).”
Distribution of phosphatase activity and various bacterial phyla in the rhizosphere of Hordeum vulgare L. depending on P availability (2015, background): “…copiotrophic bacteria because of the Please cite this article in press as: Spohn, M., et al., Distribution of pho Hordeum vulgare L. depending on P availability, Soil Biology & Biochemis high concentrations of easily degradable C sources (Hu et al., 1999; Fierer et al., 2007; Dennis et al., 2010).”
Thirty-one years of rice-rice-green manure rotations shape the rhizosphere microbial community and enrich beneficial bacteria (2017, background): “…systems because it can increase soil sustainability by reducing soil erosion, ameliorating soil physical properties (MacRae and Mehuys, 1985), and increasing the soil organic matter, fertility (Biederbeck et al., 1998) and nutrient retention (Dennis et al., 2010; Drinkwater et al., 1998).”