Immunity-associated volatile emissions of β-ionone and nonanal propagate defence responses in neighbouring barley plants

Journal of Experimental Botany, Journal Year: 2021, Volume and Issue: 73(2), P. 615 - 630

Published: Nov. 24, 2021

Plants activate biochemical responses to combat stress. (Hemi-)biotrophic pathogens are fended off by systemic acquired resistance (SAR), a primed state allowing plants respond faster and more strongly upon subsequent infection. Here, we show that SAR-like defences in barley (Hordeum vulgare) propagated between neighbouring plants, which with enhanced the volatile cues from infected senders. The emissions of sender contained 15 organic compounds (VOCs) associated Two these, β-ionone nonanal, elicited plant exposure. Whole-genome transcriptomics analysis confirmed interplant propagation defence is established as form priming. Although gene expression changes were pronounced after challenge infection receiver Blumeria graminis f. sp. hordei, differential response included an induction HISTONE DEACETYLASE 2 (HvHDA2) priming TETRATRICOPEPTIDE REPEAT-LIKE superfamily protein (HvTPL). Because HvHDA2 HvTPL transcript accumulation was also exposure our data identify both genes possible defence/priming markers barley. Our results suggest VOCs plant-plant interactions relevant for crop protection strategies

Language: Английский

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Geographic distribution of terpenoid chemotypes in Tanacetum vulgare mediates tansy aphid occurrence but not abundance

Oikos, Journal Year: 2024, Volume and Issue: 2024(7)

Published: April 9, 2024

Intraspecific variation of specialized metabolites in plants, such as terpenoids, are used to determine chemotypes. Tansy Tanacetum vulgare exhibits diverse terpenoid profiles that affect insect communities. However, it is not fully known whether patterns their chemical composition and associated insects vary beyond the community scale. Here, we investigated geographic distribution mono‐ sesquiterpenoid chemotypes tansy leaves relationships with specific communities across Germany. We sampled from ten plants five without aphids each 26 sites along a north–south west–east transect Hexane‐extracted leaf tissues were analyzed by gas chromatography‐mass spectrometry (GC‐MS). Plant morphological traits, aphid occurrence abundance, ants recorded locally. The effect plant chemotype, parameters, abiotic site parameters soil types, temperature precipitation on occurrences analyzed. Plants clustered into four monoterpenoid chemotype classes. Monoterpene classes differed latitudinal distribution, whereas sesquiterpenes more evenly distributed transect. Aphid ant was influenced monoterpenoids. class 1 colonized significantly often than expected chance, other there no significant differences. abundance affected type, average annual positively correlated ants. found chemodiversity show monoterpenoids occurrence, while type can influence abundance. chemistry influences assembly plants.

Language: Английский

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Sequestration of Exogenous Volatiles by Plant Cuticular Waxes as a Mechanism of Passive Associational Resistance: A Proof of Concept

Frontiers in Plant Science, Journal Year: 2020, Volume and Issue: 11

Published: Feb. 25, 2020

Numerous plant-derived volatile organic compounds (VOCs) induce the expression of resistance-related genes and thereby cause an "associational resistance" in neighbouring plants. However, VOCs can also be sequestered by plant cuticular waxes. In case that they maintain their biological activity, such could generate a "passive" associational resistance is independent any gene receiver. As proof concept, we used major components wax layers tree, Parkinsonia praecox, conidia Colletotrichum lindemuthianum, fungal pathogen has not been reported to infect P. praecox. Wax were re-constituted on glass slides exposed each 20 pure for 1 d then ambient air or 15 d. Gas chromatography-mass spectrometry (GC-MS) analyses showed all layers. Exposure 18 significantly inhibited germination C. lindemuthianum these after day exposure air. Four VOCs: 4Z-heptenol, farnesene, limonene, 2E-decenal, rates less than 25% controls. After d, still detectable, although at strongly reduced concentrations, no significant inhibition conidial detected anymore. Exogenous waxes least over certain time span: effect transient "passive pathogens.

Language: Английский

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Intercropping organic broccoli with Rhododendron tomentosum and Fagopyrum esculentum: a test of bottom-up and top-down strategies for reducing herbivory

Arthropod-Plant Interactions, Journal Year: 2024, Volume and Issue: 18(6), P. 1237 - 1251

Published: Feb. 2, 2024

Abstract Brassicaceous plants are attacked by a wealth of specialist herbivores that include the Diamondback moth (DBM) Plutella xylostella L. (Lepidoptera: Plutellidae), control which requires novel biocontrol strategies. DBM is cosmopolitan pest causing damage varies yearly in Finland depending on timing and extent their migration. Intercropping with companion can hamper host location or attract natural enemies. We tested two sustainable plant-based protection strategies field-grown broccoli ( Brassica oleracea var. italica), comprised 1) aromatic repellent-releasing Rhododendron tomentosum (RT) (bottom-up strategy), 2) nectar-producing buckwheat Fagopyrum esculentum (FE) (top-down strategy) combined an early-season floating row cover (mechanical control) (MC + FE). In addition, (no plant cover) mechanical (MC) without FE were included. adults yellow sticky traps larvae counted, feeding leaves was quantified. Volatile organic compounds emitted RT plots, boundary identified There mass outbreak early summer population peak mid-July when second adult generation emerged. densities significantly lower MC than plots. Broccoli plots had larval density intensity early-season. Larval intensities highest latter half July. Control number followed RT, MC, Damage higher all other treatments throughout season. at end-of-July. R. characteristic sesquiterpene alcohols, palustrol ledol, but no evidence adsorption re-release these from grown found. conclude incorporating as using reduces broccoli, further multi-year trials under varying degrees pressure needed.

Language: Английский

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Understanding the Influence of Secondary Metabolites in Plant Invasion Strategies: A Comprehensive Review

Plants, Journal Year: 2024, Volume and Issue: 13(22), P. 3162 - 3162

Published: Nov. 11, 2024

The invasion of non-native plant species presents a significant ecological challenge worldwide, impacting native ecosystems and biodiversity. These invasive significantly affect the ecosystem. threat having harmful effects on natural ecosystem is serious concern. Invasive produce secondary metabolites, which not only help in growth development but are also essential for spread these species. This review highlights important functions metabolites invasion, particularly their effect allelopathy, defense system, interaction with micro soil biota, competitive advantages. Secondary produced by play an role affecting allelopathic interactions herbivory. They sometimes change chemistry to make viable condition proliferation. inhibit changing resources available them. Therefore, it necessary understand this complicated between invasion. mainly summarizes all known species, emphasizing significance integrated weed management research.

Language: Английский

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Intercropping Reduces Root Pest Damage via Repellent Volatile Compounds: Insights From Behavioural Assays and Transcriptomic Analysis

Plant Cell & Environment, Journal Year: 2025, Volume and Issue: unknown

Published: April 2, 2025

Terrestrial plants naturally produce chemical signals to attract beneficial insects or repel harmful pests. These inherent plant attributes offer promising opportunities for eco-friendly pest control in agriculture, particularly through the push-pull intercropping technique. However, our understanding of potential repellent and their effective remains limited. In this study, we evaluated multiple species properties, identified volatile organic compounds, investigated mechanisms controlling fungus gnat Bradysia odoriphaga Chinese chives. Among 12 tested, Mentha haplocalyx, Ocimum basilicum Pelargonium graveolens demonstrated strong effects, making them candidates as 'push' plants. Eight major compounds were repellents, with 1,8-cineole being most efficient. consistently exhibited effects against gnats across various concentrations exposure durations. Transcriptomic analysis revealed that upregulated genes is associated energy production processes, suggesting can detect actively avoid compound. Field experiments further confirmed effectiveness strategy, chives M. haplocalyx significantly reduced infestations. This study presents a novel approach managing offers valuable insights into sustainable management practices agriculture.

Language: Английский

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Ecological Dynamics of Volatile Organic Compound–Mediated Interactions in Aristolochia Contorta With Parasitoids and Herbivores

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(4)

Published: April 1, 2025

In the evolutionary arms race between plants and herbivores, sophisticated mechanisms of indirect plant defense play a pivotal role. This study investigated role volatile organic compounds (VOCs) in attracting parasitoid Ooencyrtus spp. to Aristolochia contorta, while also providing insights into interactions among A. herbivore Sericinus montela, tritrophic context. utilized field surveys, olfactometer experiments, Gas Chromatography-Mass Spectrometry (GC-MS) analysis investigate VOCs. Field surveys showed 54.6% egg parasitism rate, with quadrats containing contorta larvae more than those alone. bioassays, preferred leaves damaged by pattern wheel simulating damage, 46.8% choosing these over undamaged controls. Leaves treated larval saliva were similarly attractive, drawing 48.7% spp.; however, difference attraction saliva-treated untreated was not statistically significant, suggesting may be central attraction. GC-MS identified VOCs leaves, including hexyl acetate, cyclohexene, δ-cadinene, α-pinene, β-caryophyllene, minimal amounts exo-isocitral β-pinene. Despite complex responses, our suggests saliva-induced do significantly boost finding implies that VOC response damage application is multifaceted, serving multiple defensive functions, amount insufficient substantially influence behavior toward leaves. Our results emphasize contorta's contribute understanding ecological dynamics within plant-parasitoid-herbivore interactions. Moreover, findings suggest new avenues for exploring roles chemical signals, highlighting facilitated cues defenses.

Language: Английский

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Leaffooted Bugs, Leptoglossus phyllopus (Hemiptera: Coreidae), Are Attracted to Volatile Emissions from Herbivore-Damaged Cotton Bolls

Insects, Journal Year: 2025, Volume and Issue: 16(4), P. 425 - 425

Published: April 17, 2025

The leaffooted bug, Leptoglossus phyllopus (L.) (Hemiptera: Coreidae), probes and feeds on tissues of many plant species, including developing cotton bolls, causing seed damage abscission. Insecticides are the primary tool for managing bugs, but concerns about resistance environmental harm highlight need alternative management strategies. One promising approach is using semiochemicals, such as plant- insect-produced volatile organic compounds (VOCs), to trap or repel pests. Insect herbivores often use plant-produced VOCs select suitable host plants feeding oviposition. Field observations abundant adult bugs bolls suggest that aggregate at sites. goal this study was characterize from with without bug herbivory evaluate how these affect foraging behavior. A portable dynamic headspace sampling method used collect in field, VOC samples were analyzed gas chromatography–mass spectrometry. Leaffooted induced emissions significant increases six (benzaldehyde, α-pinene, β-pinene, β-myrcene, p-xylene, (E)-β-caryophyllene). Dual-choice olfactometer assays revealed attracted damaged well being synthetic benzaldehyde α-pinene individually. In contrast, repelled by combination α-pinene. These findings attractive could contribute development lures integrated pest management.

Language: Английский

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Indirect plant defenses: volatile organic compounds and extrafloral nectar

Arthropod-Plant Interactions, Journal Year: 2021, Volume and Issue: unknown

Published: May 17, 2021

Language: Английский

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Production of Volatile Moth Sex Pheromones in Transgenic Nicotiana benthamiana Plants

BioDesign Research, Journal Year: 2021, Volume and Issue: 2021

Published: Jan. 1, 2021

Plant-based bioproduction of insect sex pheromones has been proposed as an innovative strategy to increase the sustainability pest control in agriculture. Here, we describe engineering transgenic plants producing (Z)-11-hexadecenol (Z11-16OH) and (Z)-11-hexadecenyl acetate (Z11-16OAc), two main volatile components many Lepidoptera pheromone blends. We assembled multigene DNA constructs encoding biosynthetic pathway stably transformed them into Nicotiana benthamiana plants. The contained Amyelois transitella AtrΔ11 desaturase gene, Helicoverpa armigera fatty acyl reductase HarFAR Euonymus alatus diacylglycerol acetyltransferase EaDAct gene different configurations. All pheromone-producing showed dwarf phenotypes, severity which correlated with levels. but one recovered lines produced high levels Z11-16OH, very low Z11-16OAc, probably a result recurrent truncations at level gene. Only plant line (SxPv1.2) was that harboured intact moderate Z11-16OAc (11.8 μg g-1 FW) Z11-16OH (111.4 g-1). production accompanied SxPv1.2 by partial recovery phenotype. used estimate rates release, resulted 8.48 ng FW per day for 9.44 Z11-16OAc. Our results suggest release acts limiting factor biodispenser strategies establish roadmap biotechnological improvements.

Language: Английский

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