Plant and mycorrhizal regulation of rhizodeposition.

By David L. Jones, A. Hodge, Y. Kuzyakov. New Phytologist, 2004

1,327 citations recorded by the source corpus.

The loss of carbon from roots (rhizodeposition) and the consequent proliferation of microorganisms in the surrounding soil, coupled with the physical presence of a root and processes associated with nutrient uptake, gives rise to a unique zone of soil called the rhizosphere. In this review, we bring together evidence to show that roots can directly regulate most aspects of rhizosphere C flow either by regulating the exudation process itself or by directly regulating the recapture of exudates from soil. Root exudates have been hypothesized to be involved in the enhanced mobilization and acquisition of many nutrients from soil or the external detoxification of metals. With few exceptions, there is little mechanistic evidence from soil-based systems to support these propositions. We conclude that much more integrated work in realistic systems is required to quantify the functional significance of these processes in the field. We need to further unravel the complexities of the rhizosphere in order to fully engage with key scientific ideas such as the development of sustainable agricultural systems and the response of ecosystems to climate change. Contents I. Introduction 460 II. What is rhizodeposition? 460 III. Regulation of rhizodeposition 460 IV. How large is the root exudation C flux? 463 V. How responsive is the root exudation C flux? 463 VI. How responsive is the microbial community to root exudation? 464 VII. The role of root exudates in nutrient acquisition 464 VIII. Mycorrhizal fungi and rhizodeposition 471 IX. Future thoughts 474 Acknowledgements 474 References 474.

Subfields: Plant Science, Soil Science

View Paper: https://www.semanticscholar.org/paper/4a1d50e99d9e3c0e0972bfc159d371f4ada00745

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Citations in the corpus

Impact of plant domestication on rhizosphere microbiome assembly and functions (2015, background): “Root exudates such as flavonoids or strigolactones play key roles in symbiotic relationships between plants and rhizobia, mycorrhiza and also parasites (Jones et al. 2004; Bouwmeester et al. 2007; Bednarek et al. 2010; Wang et al. 2012; Haichar et al. 2014).”
Fate of low molecular weight organic substances in an arable soil: From microbial uptake to utilisation and stabilisation (2014, background): “Microbial removal of LMWOS from solution appears within minutes in the upper soil horizons (Jones et al., 2004).”
Rhizosphere: its structure, bacterial diversity and significance (2014, background): “The active exudates are secreted through open membrane pores of the plants and have a specific function such as lubrication and defense (Jones et al. 2004; Bais et al. 2006).”
Root exudate components change litter decomposition in a simulated rhizosphere depending on temperature (2006, background): “Further properties of the soil are presented in Jones et al. (2004b).”
Modelling the rhizosphere: a review of methods for ‘upscaling’ to the whole‐plant scale (2006, background): “There will also be gradients of the 200 or so soluble organic solutes that roots release into the soil (Jones et al., 2004).”
Plant root growth, architecture and function (2009, background): “In turn, these changes to the root system architecture likely impact upon microbial dynamics in the rhizosphere through altered rhizodeposition including changes in signalling molecules released (Bais et al. 2006; Jones et al. 2004) To summarise, the information presented in this section supports th”
Does accelerated soil organic matter decomposition in the presence of plants increase plant N availability (2009, background): “With priming, more N is then transferred from the inactive SOM pool into the active microbial pool, which eventually could become available for plant uptake (Hungate, 1999; Jones et al., 2004).”
Elevated atmospheric CO2 increases microbial growth rates in soil: results of three CO2 enrichment experiments (2010, background): “Most of the C entering the soil as litter or rhizodeposits under elevated CO2 consists of energy-rich, easily available carbon sources such as low molecular sugars, and dicarboxylic acids (Jones et al., 2004) of poor quality, e.”
Resource Exchange in the Rhizosphere: Molecular Tools and the Microbial Perspective (2006, methodology): “…unclear whether, or to what extent, mycorrhizal hyphae can facilitate saprotrophic microbial attack on SOM in the rhizosphere (e.g., Fitter 2005, Jones et al. 2004), though Wamberg et al. (2003), using the molecular fingerprinting technique denaturing gradient gel electrophoresis (DGGE),…”