Impact of root exudates and plant defense signaling on bacterial communities in the rhizosphere. A review

By R. Doornbos, L. C. van Loon, P. Bakker. Agronomy for Sustainable Development, 2011

641 citations recorded by the source corpus.

Despite significant advances in crop protection, plant diseases cause a 20% yield loss in food and cash crops worldwide. Therefore, interactions between plants and pathogens have been studied in great detail. In contrast, the interplay between plants and non-pathogenic microorganisms has received scant attention, and differential responses of plants to pathogenic and non-pathogenic microorganisms are as yet not well understood. Plants affect their rhizosphere microbial communities that can contain beneficial, neutral and pathogenic elements. Interactions between the different elements of these communities have been studied in relation to biological control of plant pathogens. One of the mechanisms of disease control is induced systemic resistance (ISR). Studies on biological control of plant diseases have focused on ISR the last decade, because ISR is effective against a wide range of pathogens and thus offers serious potential for practical applications in crop protection. Such applications may however affect microbial communities associated with plant roots and interfere with the functioning of the root microbiota. Here, we review the possible impact of plant defense signaling on bacterial communities in the rhizosphere. To better assess implications of shifts in the rhizosphere microflora we first review effects of root exudates on soil microbial communities. Current knowledge on inducible defense signaling in plants is discussed in the context of recognition and systemic responses to pathogenic and beneficial microorganisms. Finally, the as yet limited knowledge on effects of plant defense on rhizosphere microbial communities is reviewed and we discuss future directions of research that will contribute to unravel the molecular interplay of plants and their beneficial microflora.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/caa6182f1282d554463aeda597bb9c5ec488e0e1

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Citations in the corpus

Current overview on the study of bacteria in the rhizosphere by modern molecular techniques: a mini‒review (2015, background): “…motility (Martínez‒Granero et al., 2006; Raaijmakers et al., 2009; Capdevila et al., 2004), availability of inorganic compounds (P and Fe) (Raaijmaker et al., 1995; Yang and Crowley, 2000; Marschner et al., 2004; 2011) and production of antibiotics (Raaijmaker et al., 1995; Doornbos et al.,2012).”
Plant growth-promoting rhizobacteria and root system functioning (2013, background): “Plant-driven selection of bacteria is an important issue recently discussed in several reviews (Hartmann et al., 2009; Doornbos et al., 2012; Drogue et al., 2012; Bulgarelli et al., 2013). www.frontiersin.org September 2013 | Volume 4 | Article 356 | 1 “fpls-04-00356” — 2013/9/12 — 18:11 — page 2 —…”
Endophytes: A Treasure House of Bioactive Compounds of Medicinal Importance (2016, background): “Similarly, various soil types, moisture, plant genotypes, root lysates etc. are the determinants of the root microbiota (Doornbos et al., 2012).”
Rhizosphere interactions: root exudates, microbes, and microbial communities1 (2014, neutral): “1) (Badri et al. 2013a; Broeckling et al. 2008; Chaparro et al. 2013a, 2013b; Doornbos et al. 2012; Micallef et al. 2009a, 2009b).”
Crop rotational diversity increases disease suppressive capacity of soil microbiomes (2018, background): “Some evidence suggests that PPS microorganisms are influenced by competition for iron, antibiosis, lytic enzymes, and induction of systemic resistance in the host plant (Doornbos et al. 2012).”
Exploring interactions of plant microbiomes (2014, background): “Microorganisms can affect agricultural productivity, for instance by assisting and controlling nutrient availability/acquisition and promoting stress tolerance (Doornbos et al., 2011; Ferrara et al., 2012; Kavamura et al., 2013).”
Next-Generation Bio-Products Sowing the Seeds of Success for Sustainable Agriculture (2013, background): “In addition, plant defense signaling play a role in this process [11].”
Biocontrol mechanism by root-associated Bacillus amyloliquefaciens FZB42 – a review (2015, background): “Besides production of antimicrobial (“antibiotics”), antiviral and nematicidal compounds, also stimulation of plant induced systemic resistance (ISR; Doornbos et al., 2012), and a beneficial effect on the composition of the host-plant microbiome might contribute to their suppressive effect…”
Stoichiometry constrains microbial response to root exudation- insights from a model and a field experiment in a temperate forest (2012, background): “…suggesting that exudation can explain much of the observed acceleration of microbial activity and biogeochemical cycling in rhizosphere soils, although altered microbial community structure or activity can also be important (Fierer et al., 2007; Brant et al., 2006a, b; Doornbos et al., 2012).”
Biological control in the microbiome era: Challenges and opportunities (2015, background): “Preliminary work highlighted the influence of plant defense pathways, such as systemic acquired resistance (SAR) and ISR, on the plant microbiota (Doornbos et al., 2012; Kniskern et al., 2007).”