A meta-analysis approach for assessing the diversity and specificity of belowground root and microbial volatiles

Schenkel, Denis; Lemfack, Marie Chantal; Piechulla, Birgit; Splivallo, Richard

doi:10.3389/fpls.2015.00707

Cited by 98 publications

(80 citation statements)

References 75 publications

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“…Given that (1) VOCs play important ecological roles in plant-plant interactions aboveground, (2) plants can detect chemical signals emitted in the rhizosphere of their neighbours (roots and associated microorganisms), and (3) roots are able to synthesise and release VOCs in the soil (Table 1), questions arise relating to the ecological roles played by belowground VOCs in root-root interactions (Schenkel et al 2015). With regard to allelopathic interactions, plant VOCs are able to generate oxidative stress (Zunino and Zygadlo 2004;Singh et al 2006).…”

Section: Studying Voc-mediated Root-root Interactions: Challenges Andmentioning

confidence: 99%

Root-emitted volatile organic compounds: can they mediate belowground plant-plant interactions?

et al. 2016

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Background Aboveground, plants release volatile organic compounds (VOCs) that act as chemical signals between neighbouring plants. It is now well documented that VOCs emitted by the roots in the plant rhizosphere also play important ecological roles in the soil ecosystem, notably in plant defence because they are involved in interactions between plants, phytophagous pests and organisms of the third trophic level. The roles played by root-emitted VOCs in between-and withinplant signalling, however, are still poorly documented in the scientific literature. Scope Given that (1) plants release volatile cues mediating plant-plant interactions aboveground, (2) roots can detect the chemical signals originating from their neighbours, and (3) roots release VOCs involved in biotic interactions belowground, the aim of this paper is to discuss the roles of VOCs in between-and withinplant signalling belowground. We also highlight the technical challenges associated with the analysis of root-emitted VOCs and the design of experiments targeting volatile-mediated root-root interactions. Conclusions We conclude that root-root interactions mediated by volatile cues deserve more research attention and that both the analytical tools and methods developed to study the ecological roles played by VOCs in interplant signalling aboveground can be adapted to focus on the roles played by root-emitted VOCs in between-and within-plant signalling.

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Section: Studying Voc-mediated Root-root Interactions: Challenges Andmentioning

confidence: 99%

Root-emitted volatile organic compounds: can they mediate belowground plant-plant interactions?

et al. 2016

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“…The responses include a combination of priming and induced defences, according to the allocation cost of different classes of defence, with plants priming more expensive responses and inducing less costly metabolites, such as extrafloral nectar or HIPVs, to attract natural enemies of the herbivore Frost et al, 2008b). Participation of volatiles in interplant below-ground interactions is not well elucidated (Schenkel et al, 2015;Delory et al, 2016). Whether VOCs emitted by roots in the rhizosphere can diffuse into the phyllosphere and convey signals to prime above-ground parts of the same plant is also not effectively documented (Erb et al, 2008).…”

Section: Airborne Signalling To Neighbouring Plants and Systemic Partmentioning

confidence: 99%

Terpenoids in plant and arbuscular mycorrhiza-reinforced defence against herbivorous insects

Sharma

Anand

Kapoor

2017

Ann Bot

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Background Plants, though sessile, employ various strategies to defend themselves against herbivorous insects and convey signals of an impending herbivore attack to other plant(s). Strategies include the production of volatiles that include terpenoids and the formation of symbiotic associations with fungi, such as arbuscular mycorrhiza (AM). This constitutes a two-pronged above-ground/below-ground attack-defence strategy against insect herbivores.Scope Terpenoids represent an important constituent of herbivore-induced plant volatiles that deter herbivores and/or attract their predators. Terpenoids serve as airborne signals that can induce defence responses in systemic undamaged parts of the plant and also prime defence responses in neighbouring plants. Colonization of roots by AM fungi is known to influence secondary metabolism in plants; this includes alteration of the concentration and composition of terpenoids, which can boost both direct and indirect plant defence against herbivorous insects. Enhanced nutrient uptake facilitated by AM, changes in plant morphology and physiology and increased transcription levels of certain genes involved in the terpenoid biosynthesis pathway result in alterations in plant terpenoid profiles. The common mycorrhizal networks of external hyphae have added a dimension to the two-pronged plant defence strategy. These act as conduits to transfer defence signals and terpenoids.Conclusion Improved understanding of the roles of terpenoids in plant and AM defences against herbivory and of interplant signalling in natural communities has significant implications for sustainable management of pests in agricultural ecosystems.

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“…Alcohols have widespread effects in plants (Piechulla et al, ), and they represent about 16% of the mVOCs diversity (Schenkel, Lemfack, Piechulla, & Splivallo, ). In this study, BA and PA were the most frequently found mVOCs, being present in more than 70% of the strains.…”

Section: Discussionmentioning

confidence: 99%

Smells from the desert: Microbial volatiles that affect plant growth and development of native and non‐native plant species

Camarena‐Pozos¹,

Flores‐Núñez²,

López³

et al. 2018

Plant Cell & Environment

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The plant microbiota can affect host fitness via the emission of microbial volatile organic compounds (mVOCs) that influence growth and development. However, evidence of these molecules and their effects in plants from arid ecosystems is limited. We screened the mVOCs produced by 40 core and representative members of the microbiome of agaves and cacti in their interaction with Arabidopsis thaliana and Nicotiana benthamiana. We used SPME‐GC‐MS to characterize the chemical diversity of mVOCs and tested the effects of selected compounds on growth and development of model and host plants. Our study revealed that approximately 90% of the bacterial strains promoted plant growth both in A. thaliana and N. benthamiana. Bacterial VOCs were mainly composed of esters, alcohols, and S‐containing compounds with 25% of them not previously characterized. Remarkably, ethyl isovalerate, isoamyl acetate, 3‐methyl‐1‐butanol, benzyl alcohol, 2‐phenylethyl alcohol, and 3‐(methylthio)‐1‐propanol, and some of their mixtures, displayed beneficial effects in A. thaliana and also improved growth and development of Agave tequilana and Agave salmiana in just 60 days. Volatiles produced by bacteria isolated from agaves and cacti are promising molecules for the sustainable production of crops in arid and semi‐arid regions.

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A meta-analysis approach for assessing the diversity and specificity of belowground root and microbial volatiles

Cited by 98 publications

References 75 publications

Root-emitted volatile organic compounds: can they mediate belowground plant-plant interactions?

Root-emitted volatile organic compounds: can they mediate belowground plant-plant interactions?

Terpenoids in plant and arbuscular mycorrhiza-reinforced defence against herbivorous insects

Smells from the desert: Microbial volatiles that affect plant growth and development of native and non‐native plant species

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