Plant volatiles as regulators of plant defense and herbivore immunity: molecular mechanisms and unanswered questions

Hu, Lingfei; Zhang, Kaidi; Wu, Zhenwei; Xu, Jianming; Erb, Matthias

doi:10.1016/j.cois.2021.03.010

Cited by 36 publications

(31 citation statements)

References 65 publications

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“…Herbivory is highly damaging to conservative species, which usually invest in BVOCs to defend against biotic and abiotic stresses. The emission of BVOC in leaves damaged by herbivory was 2.5 times greater than in intact leaves, representing a plastic phenotypic response and acts as a primer in undamaged plants (Maffei, 2010;Wölwer-Rieck et al, 2014;Hu et al, 2021).…”

Section: Variability and Differences In Bvoc Profilesmentioning

confidence: 97%

“…The constitutive GLV emitted by P. gonoachanta (CT exposure) could represent an investment in induced defenses, indicating the onset of an "alert" state and an accelerated response in case of attack by herbivores (Engelberth et al, 2004;Maffei, 2010). Therefore, most GLV might indicate the occurrence of chemical communication processes, preparing the healthy plant for a future herbivorous attack (Hu et al, 2021). The accumulation of H 2 O 2 and PCD detected in the pulvinus of P. gonoachanta is directly related to intense defoliation (Moura et al, 2014(Moura et al, , 2018, which may be a consequence of the GLV emission, produced by H 2 O 2 signaling and lipoxygenases mechanisms (LOX) that induce plant defenses (Tian et al, 2019).…”

Section: Variability and Differences In Bvoc Profilesmentioning

confidence: 99%

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Ozone Impact on Emission of Biogenic Volatile Organic Compounds in Three Tropical Tree Species From the Atlantic Forest Remnants in Southeast Brazil

et al. 2022

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Plants emit a broad number of Biogenic Volatile Organic Compounds (BVOCs) that can impact urban ozone (O3) production. Conversely, the O3 is a phytotoxic pollutant that causes unknown alterations in BVOC emissions from native plants. In this sense, here, we characterized the constitutive and O3-induced BVOCs for two (2dO3) and four (4dO3) days of exposure (O3 dose 80 ppb) and evaluated the O3 response by histochemical techniques to detect programmed cell death (PCD) and hydrogen peroxide (H2O2) in three Brazilian native species. Croton floribundus Spreng, Astronium graveolens Jacq, and Piptadenia gonoacantha (Mart.) JF Macbr, from different groups of ecological succession (acquisitive and conservative), different carbon-saving defense strategies, and specific BVOC emissions. The three species emitted a very diverse BVOC composition: monoterpenes (MON), sesquiterpenes (SEQ), green leaf volatiles (GLV), and other compounds (OTC). C. floribundus is more acquisitive than A. graveolens. Their most representative BVOCs were methyl salicylate—MeSA (OTC), (Z) 3-hexenal, and (E)-2-hexenal (GLV), γ-elemene and (−)-β-bourbonene (SEQ) β-phellandrene and D-limonene (MON), while in A. graveolens were nonanal and decanal (OTC), and α-pinene (MON). Piptadenia gonoachanta is more conservative, and the BVOC blend was limited to MeSA (OTC), (E)-2-hexenal (GLV), and β-Phellandrene (MON). The O3 affected BVOCs and histochemical traits of the three species in different ways. Croton floribundus was the most O3 tolerant species and considered as an SEQ emitter. It efficiently reacted to O3 stress after 2dO3, verified by a high alteration of BVOC emission, the emergence of the compounds such as α-Ionone and trans-ß-Ionone, and the absence of H2O2 detection. On the contrary, A. graveolens, a MON-emitter, was affected by 2dO3 and 4dO3, showing increasing emissions of α-pinene and β-myrcene, (MON), γ-muurolene and β-cadinene (SEQ) and H2O2 accumulation. Piptadenia gonoachanta was the most sensitive and did not respond to BVOCs emission, but PCD and H2O2 were highly evidenced. Our results indicate that the BVOC blend emission, combined with histochemical observations, is a powerful tool to confirm the species’ tolerance to O3. Furthermore, our findings suggest that BVOC emission is a trade-off associated with different resource strategies of species indicated by the changes in the quality and quantity of BVOC emission for each species.

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Section: Variability and Differences In Bvoc Profilesmentioning

confidence: 97%

Section: Variability and Differences In Bvoc Profilesmentioning

confidence: 99%

Ozone Impact on Emission of Biogenic Volatile Organic Compounds in Three Tropical Tree Species From the Atlantic Forest Remnants in Southeast Brazil

et al. 2022

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“…Table 1 compares the various in vivo electrochemical and plant nanobionic sensors, plant metabolites it detects, nanomaterial-based sensor design, detection method and plant species that the sensors were demonstrated in. Besides internal signaling molecules and plant phytohormones, plants also emit surface metabolites in the form of electrical signals, and air-borne metabolites in the form of volatile organic compounds (VOCs) serving as chemical signals that mediate inter-plant communication, and trigger defense responses of neighboring receiver plants (Erb, 2018 ; Hu et al, 2021 ). This forms the basis of crop yield enhancement through intercropping.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive Technologies for Plant Health Diagnosis

Ang

Lew

2022

Front. Plant Sci.

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As global population grows rapidly, global food supply is increasingly under strain. This is exacerbated by climate change and declining soil quality due to years of excessive fertilizer, pesticide and agrichemical usage. Sustainable agricultural practices need to be put in place to minimize destruction to the environment while at the same time, optimize crop growth and productivity. To do so, farmers will need to embrace precision agriculture, using novel sensors and analytical tools to guide their farm management decisions. In recent years, non-destructive or minimally invasive sensors for plant metabolites have emerged as important analytical tools for monitoring of plant signaling pathways and plant response to external conditions that are indicative of overall plant health in real-time. This will allow precise application of fertilizers and synthetic plant growth regulators to maximize growth, as well as timely intervention to minimize yield loss from plant stress. In this mini-review, we highlight in vivo electrochemical sensors and optical nanosensors capable of detecting important endogenous metabolites within the plant, together with sensors that detect surface metabolites by probing the plant surface electrophysiology changes and air-borne volatile metabolites. The advantages and limitations of each kind of sensing tool are discussed with respect to their potential for application in high-tech future farms.

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“…Some volatile organic compounds (VOCs) emitted by a plant have a repellent (deterrent) effect on agrophages (Cardoza et al, 2003). As a rule, plant damage is reflected in the increased emission of green leaf volatiles (GLVs), while terpenes and sesquiterpenes emissions are specific to a specific herbivorous species or even to the way of feeding (Hu et al, 2021). In addition to herbivorous attacks, plants also emit VOCs in the event of mechanical damage, as exemplified by the plant Minthostachys mollis , which, if damaged, emits monoterpenes, such as pulegone and mentone (Banchio et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Volatile organic compounds released by wheat as a result of striped shieldbug feeding and insect behaviour

Sendel

Bocianowski

Buszewski

et al. 2022

J Applied Entomology

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The most popular plant protection method is chemical; however, this is often connected with repeated treatments. Therefore, eco‐friendly strategies need to be investigated. A good alternative is to use the natural repellent properties of plants. The aims of this study were to determine how adult striped shieldbugs (Aelia acuminata L.) feeding on spring wheat plants affect the emission of volatile organic compounds (VOCs) and to determine the reaction of these insects to synthetic blends of VOCs. Using GC/MS for VOC analysis, we find that Aelia acuminata L. (1 or 2 adult pairs) significantly induced VOC emissions from wheat plants. In comparison with controls, larger amounts of (Z)‐3‐hexenal, (E)‐2‐hexenal, (Z)‐3‐hexen‐1‐ol, (E)‐2‐hexen‐1‐ol, β‐pinene, β‐myrcene, (Z)‐3‐hexen‐1‐yl acetate, 1‐hexyl acetate, 4‐heptanone, (Z)‐ocimene, linalool, linalool oxide, benzyl acetate, methyl salicylate, indole, β‐caryophyllene and (E)‐β‐farnesene were released as a result of the biotic stress, with two pairs of insects causing a significantly stronger plant reaction. On the basis of the VOCs identified and their emitted concentrations for two pairs of feeding adult striped shieldbugs, two blends of VOCs were prepared in three concentrations: blend I—(Z)‐3‐hexenal, (E)‐2‐hexenal, (Z)‐3‐hexen‐1‐ol, (E)‐2‐hexen‐1‐ol, (Z)‐3‐hexen‐1‐yl acetate and 1‐hexyl acetate, and blend II—(Z)‐ocimene, linalool, benzyl acetate, methyl salicylate, β‐caryophyllene and (E)‐β‐farnesene. Using an olfactometer (Y‐tube) to study insect behaviour, it was found that the male striped shieldbugs were not attracted to any of the blends at any concentration. Female shieldbugs were attracted to blend I at concentration 1. As for the remaining concentrations of both blends, females and males were repelled, with the higher the concentration the stronger the insect reaction.

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Plant volatiles as regulators of plant defense and herbivore immunity: molecular mechanisms and unanswered questions

Cited by 36 publications

References 65 publications

Ozone Impact on Emission of Biogenic Volatile Organic Compounds in Three Tropical Tree Species From the Atlantic Forest Remnants in Southeast Brazil

Ozone Impact on Emission of Biogenic Volatile Organic Compounds in Three Tropical Tree Species From the Atlantic Forest Remnants in Southeast Brazil

Non-destructive Technologies for Plant Health Diagnosis

Volatile organic compounds released by wheat as a result of striped shieldbug feeding and insect behaviour

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