Microbial homoserine lactones (AHLs) are effectors of root morphological changes in barley

Rankl, Simone; Gunsè, Benet; Sieper, Tina; Schmid, Christoph; Poschenrieder, Charlotte; Schröder, Peter

doi:10.1016/j.plantsci.2016.09.014

Cited by 33 publications

(17 citation statements)

References 70 publications

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“…Changes in IAA levels due to PcO6 metabolism of root-supplied tryptophan (Adams et al 2016) or responses to acyl homoserine lactones (AHSLs) produced by the bacterium (Goodman et al 2016) are two of these possibilities. AHSLs increased lateral root formation in barley (Rankl et al 2016) Other wheat genes that responded to NPs for the colonized plant included those involved in responses to heavy metals and ROS. These findings align with accumulations of Cu or Zn in shoots of colonized plants grown with CuO or ZnO NPs.…”

Section: Discussionmentioning

confidence: 99%

Remodeling of root morphology by CuO and ZnO nanoparticles: effects on drought tolerance for plants colonized by a beneficial pseudomonad

Yang

Doxey

McLean

et al. 2018

Botany

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Formulations that include nanoparticles of CuO and ZnO are being considered for agricultural applications as fertilizers because they act as sources of Cu or Zn. Currently, few studies of the effects of these nanoparticles (NPs) consider the three-way interactions of NPs with the plant plus its microbiome. At doses that produced root shortening by both nanoparticles (NPs), CuO NPs induced the proliferation of elongated root hairs close to the root tip, and ZnO NPs increased lateral root formation in wheat seedlings (Triticum aestivum L.). These responses occurred with roots colonized by a beneficial bacterium, Pseudomonas chlororaphis O6 (PcO6), originally isolated from roots of wheat grown under dryland farming in calcareous soils. The PcO6-induced tolerance to drought stress in wheat seedlings was not impaired by the NPs. Rather, growth of the PcO6-colonized plants with NPs resulted in systemic increases in the expression of genes associated with tolerance to water stress. Increased expression in the shoots of other genes related to metal stress was consistent with higher levels of Cu and Zn in PcO6-colonized shoots grown with the NPs. This work demonstrates that plants grown with CuO or ZnO NPs showed cross-protection from different challenges such as metal stress and drought.

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Section: Discussionmentioning

confidence: 99%

Remodeling of root morphology by CuO and ZnO nanoparticles: effects on drought tolerance for plants colonized by a beneficial pseudomonad

Yang

Doxey

McLean

et al. 2018

Botany

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“…Similarly, other AHL molecules like the short-chained C6-HSL and C8-HSL also increased root length (Von Rad et al, 2008;Schenk et al, 2012). Such modifications were observed also in other plants; for instance, in wheat and barley, where the presence of AHL increased root length and plant biomass (Rankl et al, 2016;Moshynets et al, 2019), or in mung bean, where AHL induced the formation of adventitious roots (Bai et al, 2012). The morphological response to multiple AHL molecules seems to be different from the response to a single AHL.…”

Section: Discussionmentioning

confidence: 90%

Impact of Quorum Sensing Molecules on Plant Growth and Immune System

et al. 2020

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Bacterial quorum-sensing (QS) molecules are one of the primary means allowing communication between bacterial cells or populations. Plants also evolved to perceive and respond to those molecules. N-acyl homoserine lactones (AHL) are QS molecules, of which impact has been extensively studied in different plants. Most studies, however, assessed the interactions in a bilateral manner, a nature of interactions, which occurs rarely, if at all, in nature. Here, we investigated how Arabidopsis thaliana responds to the presence of different single AHL molecules and their combinations. We assumed that this reflects the situation in the rhizosphere more accurately than the presence of a single AHL molecule. In order to assess those effects, we monitored the plant growth and defense responses as well as resistance to the plant pathogen Pseudomonas syringae pathovar tomato (Pst). Our results indicate that the complex interactions between multiple AHL and plants may have surprisingly similar outcomes. Individually, some of the AHL molecules positively influenced plant growth, while others induced the already known AHL-priming for induced resistance. Their combinations had a relatively low impact on the growth but seemed to induce resistance mechanisms. Very striking was the fact that all triple, the quadruple as well as the double combination(s) with longchained AHL molecules increased the resistance to Pst. These findings indicate that induced resistance against plant pathogens could be one of the major outcomes of an AHL perception. Taken together, we present here the first study on how plants respond to the complexity of bacterial quorum sensing.

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“…C6-HSL, 3OC6-HSL and 3OC8-HSL promote primary root elongation of Arabidopsis (von Rad et al 2008;Liu et al 2012;Zhao et al 2015). C6-HSL, C8-HSL and C12-HSL promote shoot growth and induce lateral root formation in barley (Klein et al 2009;Rankl et al 2016). 3OC10-HSL influences the formation of adventitious roots in mung beans (Bai et al 2012).…”

Section: Discussionmentioning

confidence: 99%

N-3-oxo-hexanoyl-homoserine lactone, a bacterial quorum sensing signal, enhances salt tolerance in Arabidopsis and wheat

Zhao

Yang

et al. 2020

Bot Stud

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Background: N-acyl-homoserine lactones (AHLs) are the quorum sensing (QS) signal molecules to coordinate the collective behavior in a population in Gram-negative bacteria. Recent evidences demonstrate their roles in plant growth and defense responses. Results: In present study, we show that the treatment of plant roots with N-3-oxo-hexanoyl-homoserine lactone (3OC6-HSL), one molecule of AHLs family, resulted in enhanced salt tolerance in Arabidopsis and wheat. We found that the growth inhibition phenotype including root length, shoot length and fresh weight were significantly improved by 3OC6-HSL under salt stress condition. The physiological and biochemical analysis revealed that the contents of chlorophyll and proline were increased and the contents of MDA and Na + and Na + /K + ratios were decreased after 3OC6-HSL treatment in Arabidopsis and wheat under salt stress condition. Molecular analysis showed that 3OC6-HSL significantly upregulated the expression of salt-responsive genes including ABA-dependent osmotic stress responsive genes COR15a, RD22, ADH and P5CS1, ABA-independent gene ERD1, and ion-homeostasis regulation genes SOS1, SOS2 and SOS3 in Arabidopsis under salt stress condition. Conclusions: These results indicated that 3OC6-HSL enhanced plant salt tolerance and ABA-dependent and ABAindependent signal pathways and SOS signaling might be involved in the induction of salt resistance by 3OC6-HSL in plants. Our data provide a new insight into the plant-microbe inter-communication.

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Microbial homoserine lactones (AHLs) are effectors of root morphological changes in barley

Cited by 33 publications

References 70 publications

Remodeling of root morphology by CuO and ZnO nanoparticles: effects on drought tolerance for plants colonized by a beneficial pseudomonad

Remodeling of root morphology by CuO and ZnO nanoparticles: effects on drought tolerance for plants colonized by a beneficial pseudomonad

Impact of Quorum Sensing Molecules on Plant Growth and Immune System

N-3-oxo-hexanoyl-homoserine lactone, a bacterial quorum sensing signal, enhances salt tolerance in Arabidopsis and wheat

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