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Development and validation of a liquid chromatography-electrospray ionization-time-of-flight mass spectrometry method for induced changes in Nicotiana attenuata leaves during simulated herbivory

ABSTRACT: Metabolite profiling of herbivory-induced changes in Nicotiana attenuata was used to construct a correlation-weighted network to visualize intra- and inter-compound spectra relationships from individual mass features, and to annotate 12 major network hubs, including 4 O-acyl sugars and 6 17-hydroxygeranyllinalool diterpene glycosides, metabolites with recently uncovered anti-herbivore functions.

INSTRUMENT(S): Liquid Chromatography MS - - reverse phase - micrOTOF II ESI TOF (Bruker)

PROVIDER: MTBLS10 | MetaboLights | 2012-08-14

REPOSITORIES: MetaboLights

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			Action	DRS
	02sa00l00h1a1_27_01_5561.cdf	Other
	02sa00l00h1b1_28_01_5562.cdf	Other
	02sa00l00h1c1_29_01_5563.cdf	Other
	02sa00l00h1d1_30_01_5564.cdf	Other
	02sa00l00h1e1_31_01_5567.cdf	Other

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Publications

Development and validation of a liquid chromatography-electrospray ionization-time-of-flight mass spectrometry method for induced changes in Nicotiana attenuata leaves during simulated herbivory.

Gaquerel Emmanuel E Heiling Sven S Schoettner Matthias M Zurek Gabriela G Baldwin Ian T IT

Journal of agricultural and food chemistry 20100901 17

A liquid chromatography-electrospray ionization-time-of-flight mass spectrometry (HPLC/ESI-TOF-MS) procedure was developed to characterize changes induced in Nicotiana attenuata leaves 1 h and 5 days after wounding and application of Manduca sexta elicitors. The constancy of the measurement conditions was first confirmed for 22 selected analytes spanning the entire chromatogram. Using the Profile Analysis software, we extracted 367 buckets, which were analyzed by principal component analysis and ...[more]

PMID: 20701244

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Comparison of Solanum dulcamara transcriptome after real and simulated herbivory

Project description:Plants are attacked by diverse herbivores and respond with manifold defense responses. To study transcriptional and other early regulation events of these plant responses, herbivory is often mimicked to standardize the temporal and spatial dynamics that vary tremendously for natural herbivory. Yet to what extent such mimics of herbivory are able to elicit the same plant response as real herbivory remains largely undetermined. We examined the transcriptional response of a new model plant to herbivory by a lepidopteran larva and to a commonly used herbivory mimic by applying the larvae’s oral secretions to standardized wounds. We designed a microarray for Solanum dulcamara and showed that the transcriptional response to real and to simulated herbivory by Spodoptera exigua overlapped moderately by about 40%. Interestingly, certain responses were mimicked better than others; 60% of the genes up-regulated but not even a quarter of the genes down-regulated by herbivory were similarly affected by application of oral secretions to wounds. While the regulation of genes involved in signaling, defense and water stress were mirrored well by the herbivory mimic, most of the genes related to photosynthesis, carbohydrate- and lipid metabolism were exclusively regulated by real herbivory. Thus, wounding and elicitor application decently mimics herbivory-induced defense responses but likely not the re-allocation of primary metabolites induced by real herbivory.

2017-04-24 | GSE97043 | GEO

Early transcriptomic responses of rice leaves to herbivory by Spodoptera frugiperda

Project description:In this experiment we aimed to decipher the transcription response of rice to the different cues of an herbivory attack from the chewing caterpillar Spodoptera frugiperda. We performed a herbivory mimic procedure on seedlings and applied mechanical wounding (WOS), application of herbivore oral secretions (OS) after wounding (WOS+) and dysbiotic OS (WOS-) on rice leaves. RNA was extracted from control and treated leaves after two hours. 5 biological replicates corresponding to 5 pooled leaves were performed for each of the four condition

2023-08-31 | E-MTAB-13227 | biostudies-arrayexpress

Nicotiana attenuata transcriptome after oviposition and herbivory by S. exigua and M. sexta

Project description:Oviposition by lepidopteran herbivores on Nicotiana attenuata primes plant defence responses that are induced by the feeding larvae. While oviposition by both the generalist Spodoptera exigua and the specialist Manduca sexta primes the production of defensive phenylpropanoids, their larvae are differentially affected. We investigate here the impact of prior oviposition on the transcriptome and phytohormone levels of plants that were later attacked by larvae to find regulatory signals of this priming. In a full-factorial design, we evaluated the effects of oviposition and herbivory by both species. Oviposition alone had only subtle effects at the transcriptional level. Laval feeding alone induced species-specific plant responses. Larvae of the generalist regulated phytohormones and gene expression stronger than larvae of the specialist. A day after larvae started to feed, we detected no significant alterations of the plant's response to larval feeding due to prior oviposition by conspecific moths. Yet, oviposition by each of the species profoundly influenced the plant's transcriptional and phytohormonal response to feeding larvae of the other species. Remarkably, the species-specific plant responses to larval feeding shifted towards the response normally elicited by larvae of the ovipositing species. Thus, plants may already recognise an insect's identity upon its oviposition.

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24-hour herbivory exposure of VHb-expressing Populus tremula x Populus tremuloides

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Hidden players in plant-insect interactions: effects of third-trophic level symbionts on responses of plants to herbivory

Project description:Mutualistic symbionts are increasingly recognized as hidden players in plant-insect interactions. Understanding how symbionts affect plant responses to herbivory provides important insight into the fascinating complexity of terrestrial ecological networks and how we could specifically target symbionts to achieve sustainable pest management. Although the role of herbivore-associated symbionts is gaining increased attention in ecology of plant-insect interactions, how symbionts of members of higher trophic levels affect these interactions is poorly understood. The natural enemies of insect herbivores such as parasitic wasps that are used in biological pest control are associated with mutualistic symbionts (polydnaviruses) that they inject into the herbivore along with eggs in an event of parasitisation. We showed previously that polydnavirus-genes are expressed in the salivary glands of parasitized caterpillars suggesting that third-trophic level symbionts may alter the herbivore’s salivary composition and consequently, affect the way the herbivore interacts with the plant. By using a novel multidisciplinary approach that integrates molecular, chemical, behavioral and field ecology, the proposed project aims to manipulate the phenotype of caterpillars to study the effect of symbiotic viruses of third-trophic-level insects at the plant-herbivore interface. We will address this issue at different levels of biological organization, from plant gene expression to plant-mediated ecological consequences. The project will thereby provide novel fundamental insights into the hidden role played by parasitic wasp symbionts in plant responses to herbivory and these insights will generate important knowledge for pest management programs that focus on polydnaviruses as biological control agents.

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Dicer-like proteins and their role in plant-herbivore interactions in Nicotiana attenuata

Project description:DICER-like proteins produce small RNAs that silence genes involved in development and defenses against viruses and pathogens. Which DCLs participate in plant-herbivore interactions remains unstudied. We identified four distinct DCL genes and stably silenced their expression by RNAi in Nicotiana attenuata, a model system for the study of plant-herbivore interactions. Silencing DCL1 expression was lethal to the plants. Manduca sexta larvae performed significantly better on ir-dcl3and ir-dcl4 plants, but not on ir-dcl2 plants compared to wild type plants. Phytohormones, defense metabolites and microarray analyses revealed that when DCL3 and DCL4 were silenced separately, herbivore resistance traits were regulated in distinctly different ways. Crossing of the lines revealed complex interactions in the patterns of regulation. Single ir-dcl4 and double ir-dcl2/ ir-dcl3 plants were impaired in JA accumulation, while JA-Ile was increased in ir-dcl3 plants. Ir-dcl3 and ir-dcl4 plants were impaired in nicotine accumulation; silencing DCL2 in combination with either DCL3 or DCL4 restored nicotine levels to those of WT. Trypsin proteinase inhibitor activity and transcripts were only silenced in ir-dcl3 plants. We conclude that DCL2/3/4 interact in a complex manner to regulate anti-herbivore defenses and that these interactions significantly complicate the already challenging task of understanding smRNA function in the regulation of biotic interactions. Gene expression in leaves of Nicotiana attenuata wild type, irDCL3 and irDCL4 plants was measured at 1 hour after elicitation with oral secretions of Manduca sexta larvae. Three independent experiments were performed with wild type plants and three independent experiments were performed with irDCL3 and irDCL4 plants. A total of 811 genes were identified as differentially regulated in irDCL3 and irDCL4 compared to wild type plants.

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