Plant responses to plant growth-promoting rhizobacteria

By L. C. van Loon. European journal of plant pathology, 2007

967 citations recorded by the source corpus.

Non-pathogenic soilborne microorganisms can promote plant growth, as well as suppress diseases. Plant growth promotion is taken to result from improved nutrient acquisition or hormonal stimulation. Disease suppression can occur through microbial antagonism or induction of resistance in the plant. Several rhizobacterial strains have been shown to act as plant growth-promoting bacteria through both stimulation of growth and induced systemic resistance (ISR), but it is not clear in how far both mechanisms are connected. Induced resistance is manifested as a reduction of the number of diseased plants or in disease severity upon subsequent infection by a pathogen. Such reduced disease susceptibility can be local or systemic, result from developmental or environmental factors and depend on multiple mechanisms. The spectrum of diseases to which PGPR-elicited ISR confers enhanced resistance overlaps partly with that of pathogen-induced systemic acquired resistance (SAR). Both ISR and SAR represent a state of enhanced basal resistance of the plant that depends on the signalling compounds jasmonic acid and salicylic acid, respectively, and pathogens are differentially sensitive to the resistances activated by each of these signalling pathways. Root-colonizing Pseudomonas bacteria have been shown to alter plant gene expression in roots and leaves to different extents, indicative of recognition of one or more bacterial determinants by specific plant receptors. Conversely, plants can alter root exudation and secrete compounds that interfere with quorum sensing (QS) regulation in the bacteria. Such two-way signalling resembles the interaction of root-nodulating Rhizobia with legumes and between mycorrhizal fungi and roots of the majority of plant species. Although ISR-eliciting rhizobacteria can induce typical early defence-related responses in cell suspensions, in plants they do not necessarily activate defence-related gene expression. Instead, they appear to act through priming of effective resistance mechanisms, as reflected by earlier and stronger defence reactions once infection occurs.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/2ae2a7149c53e241225d0072021e9a91a48b19d0

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In Plant Science

1. G. Berg
2. P. Bakker
3. A. Sessitsch
4. B. Lugtenberg
5. L. Passaglia
6. S. Compant
7. Muhammad Naveed
8. A. Ambrosini

Citations in the corpus

• Induction of systemic resistance, root colonisation and biocontrol activities of the rhizospheric strain of Serratia plymuthica are dependent on N-acyl homoserine lactones (2009, background): “…examples include altering root exudation from pea seedlings, which interfere with QS regulation in the bacteria; significant change in the accumulation of proteins in Medicago truncatula, or the expression of plant defence genes in tomato (Bauer et al. 2004; Schuhegger et al. 2006; van Loon 2007).”
• Plant Growth-Promoting Rhizobacteria Enhance Abiotic Stress Tolerance in Solanum tuberosum Through Inducing Changes in the Expression of ROS-Scavenging Enzymes and Improved Photosynthetic Performance (2012, background): “The underlying mechanisms of plant growth promotion by PGPR have been comprehensively described in several articles (van Loon 2007; Kloepper and others 2004b; Yang and others 2009).”
• Advances in Elucidating Beneficial Interactions Between Plants, Soil, and Bacteria (2013, background): “Although not as intensively studied as auxins, cytokinins and gibberellins have also been reported to stimulate plant growth (Cassán et al., 2009; van Loon, 2007).”
• The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms. (2013, background): “…2001), parasitism (Druzhinina et al., 2011; Mela et al., 2011), interference with quorum sensing affecting virulence (Lin et al., 2003; Uroz et al., 2009; Chan et al., 2011), and induced systemic resistance (Conrath, 2006; van Loon, 2007; Yang et al., 2009; Pieterse, 2012; Schenk et al., 2012).”
• Microbial ACC-Deaminase: Prospects and Applications for Inducing Salt Tolerance in Plants (2010, background): “Disease suppression in plants generally occurs through the induction of resistance by microbes (Van Loon, 2007) and PGPR bring about a change in the host-plant vulnerability through a mechanism called induced systemic resistance (ISR), which results in the reduction of the disease (Kagale et al.,…”
• The effect of plant growth-promoting rhizobacteria on the growth of rice (Oryza sativa L.) cropped in southern Brazilian fields (2012, background): “Under gnotobiotic conditions, eight isolates were able to stimulate the growth of rice plants.”
• Bacteria able to control foot and root rot and to promote growth of cucumber in salinated soils (2011, background): “…damage caused by plant pathogens and promote plant growth include antagonism (Thomashow and Weller 1996), induction of systemic resistance (Van Loon 2007), competition for nutrients and niches (Kamilova et al. 2005), mobilization of nutrients (Lifshitz et al. 1987; Lugtenberg et al. 2001),…”