JHI At v4 RH timecourse
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
SUBMITTER: Pete Hedley
PROVIDER: E-MTAB-1140 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Salicylic acid (SA) and jasmonic acid (JA) fulfill key signaling functions in plant responses to herbivores. However, the mechanisms that facilitate systemic signaling in response to phloem-feeding insects remain poorly defined. Rapid local and systemic transcriptome reprogramming patterns observed in Arabidopsis thaliana following infestation by the green peach aphid (Myzus persicae Sulzer) identify abscisic acid (ABA) and redox-signalling as key factors in the transmission of signals from local to systemic leaves. Moreover, aphid fecundity was increased in mutants that were defective in ABA-signaling through ABA-INSENSITIVE 4 and show constitutive up-regulation of SA- and JA-mediated defense pathways. Conversely, aphid fecundity was decreased and aphid vigor was impaired on vitamin C2 mutants that are defective in the major low molecular weight antioxidant of plant cells, ascorbic acid and show constitutive up-regulation of redox defense and SA-mediated pathways but reduced up-regulation of JA-mediated pathways. Crossing vtc2 with abi4 restored the wild type sensitivity to aphids. Hence aphid fecundity was attenuated by low ascorbate in a manner that was dependent on the functions of the ABI4 transcription factor. ABI4 is not only an important regulator of systemic defenses against aphids but it makes a significant contribution to the SA-mediated repression of JA signaling.
2013-03-11 | E-MTAB-1142 | biostudies-arrayexpress
Project description:Aphids are phloem-feeding insects that cause yield loss on a wide range of crops, including cereals such as barley. While most aphid species are limited to one or few host species, some are able to reproduce on many plants belonging to different families. Interestingly, aphid probing-behaviour can be observed on both host and non-host species indicating that interactions take place at the molecular level that may impact host range. Here, we aimed to gain insight into the interaction of barley with aphid species differing in their ability to infest this crop by analysing transcriptional responses. First, we determined colonization efficiency, settlement, and probing behaviour for the aphid species Rhopalosiphum padi, Myzus persicae and Myzus cerasi, which defined host, poor-host and non-host interactions, respectively. Analyses of barley transcriptional responses revealed gene sets differentially regulated upon the different barley-aphid interactions and showed that the poor-host interaction with M. persicae resulted in the strongest deregulation of genes. Interestingly, we identified several thionin genes strongly up-regulated upon interaction with M. persicae, and to a lesser extend upon R. padi interaction. Ectopic expression of two of these genes in Nicotiana benthamiana reduced host susceptibility to M. persicae, indicating thionins contribute to defences against aphids.
2017-01-23 | E-MTAB-5133 | biostudies-arrayexpress
Project description:The bird cherry-oat aphid (Rhopalosiphum padi L.) (Homoptera: Aphididae) is an important pest on cereals causing plant growth reduction but no specific leaf symptoms. Breeding of barley (Hordeum vulgare L.) for R. padi resistance shows that there are several resistance genes involved, reducing aphid growth. In an attempt to identify candidate sequences for resistance-related genes, we performed a microarray analysis of gene expression after two days of aphid infestation in two susceptible barley lines and two genotypes with partial resistance. One of the four lines is a descendant of two of the other genotypes. The analysis revealed large differences in gene induction between the four lines, indicating substantial variation in response even between closely related genotypes. Genes induced in the aphid-infested tissue were mainly related to defence, primary metabolism and signalling. Only twenty-four genes were induced in all lines, none of them related to oxidative stress or secondary metabolism. Few genes were down-regulated and none of those was common to all four lines. There were differences in aphid-induced gene regulation between resistant and susceptible lines, and results from control plants without aphids also revealed differences in constitutive gene expression between the two types of lines. Candidate sequences for both induced and constitutive resistance factors have been identified, among them a proteinase inhibitor, a Ser/Thr kinase and several thionins. Experiment Overall Design: Four barley genotypes, two (Lina, Kara) with susceptibility to the bird cherry-oat aphid (Rhopalosiphum padi) and two (Hsp5, 28:4) with partial resistance, were infested with R. padi. After 48 h of aphid feeding, changes in transcript accumulation were analysed by comparing aphid-infested plants with control (uninfested) plants for each genotype. For each treatment, 3 biological replicates were analysed. Overlaps and differences in regulation of RNA abundance were identified between the four genotypes. 28:4 is a descendant of Hsp5 and Lina.
2009-02-07 | E-GEOD-12584 | biostudies-arrayexpress
Project description:This study was designed to identify the sRNAs in Aphis gossypii (cotton-melon aphid) during Vat-mediated resistance in teraction with melon Methods: Whole insects were collected from susceptible (Vat-) and resistant (Vat+) plants after 48 hours of feeding. Total RNA was extracted from the aphids and enriched for LMW RNA and small RNA libraries were constructed using standard protocols and deep sequenced using Illumina GAII analyzer.
2013-06-01 | E-GEOD-38641 | biostudies-arrayexpress
Project description:In most aphid species, facultative parthenogenetic reproduction allows rapid growth and formation of large single-genotype colonies. Upon predator attack, individual aphids emit an alarm pheromone to warn the colony of this danger. (E)-beta-farnesene (EBF) is the predominant constituent of the alarm pheromone in Myzus persicae (green peach aphid) and many other aphid species. Continuous exposure to alarm pheromone in aphid colonies raised on transgenic Arabidopsis thaliana plants that produce EBF leads to habituation of the aphid population. Whereas naïve aphids are repelled by EBF, habituated aphids show no avoidance response. Individual aphids from the habituated colony can revert back to being EBF-sensitive in three generations, indicating that this behavioral change is not caused by a genetic mutation. Instead, DNA microarray experiments comparing gene expression in naïve and habituated aphids treated with EBF demonstrate an almost complete desensitization in the transcriptional response to EBF. Furthermore, EBF-responsive aphids, but not habituated aphids show significantly lower reproduction in the presence of EBF. Although both naïve and habituated aphids emit EBF upon damage, EBF-responsive aphids display a higher survival rate in the presence of coccinellid predators and thus outperform habituated aphids that do not show an avoidance response. These results provide direct evidence that aphid perception of conspecific alarm pheromone aids in predator avoidance and thereby bestows fitness benefits in survivorship and fecundity. Although habituated M. persicae have equal fecundity on control and EBF-producing plants, such transgenics may have practical applications in agriculture because of increased predation of habituated aphids. Log fold-changes (LogFC) were computed and contigs with P-values ≤ 0.05 were considered to be differentially expressed (see Supplementary file at foot of this record). Agilent 8x15K array previously reported by Ramsey et al., 2007 - BMC Genomics 8: 243. Two-condition experiment using Alexa Fluor 555 and 647 dyes. Biological replicates: 4 control replicates, 4 treated replicates.
2010-02-28 | E-GEOD-20445 | biostudies-arrayexpress
Project description:Background: Aphids are economically important pests and that display exceptional variation in host range. The underlying mechanism of diverse aphid host ranges are not well understood, but it is likely that molecular interactions are involved. With significant progress being made towards understanding host responses upon aphid attack, the mechanisms underlying nonhost resistance remain to be elucidated. Here, we investigated and compared Arabidopsis host and nonhost responses to aphids at the transcriptome level using three different aphid species. Results: Gene expression analyses revealed a surprising level of overlap in the overall gene expression changes during host and nonhost interactions with regards to the sets of genes differentially expressed and the direction of expression changes. Despite the overlap in transcriptional responses across interactions, there was a stronger repression of genes involved in metabolism and oxidative responses specifically during the host interaction. In addition we indentified a set of genes with opposite gene expression patterns during host versus nonhost interactions. Aphid performance assays on Arabidopsis mutants selected based on our transcriptome analyses identified genes involved in host and nonhost interactions. Conclusions: Understanding how plants respond to aphid species that differ in their ability to infest plant species, and identifying the genes and signaling pathways involved, is essential for the development of novel and durable aphid control in crop plants. Our work is an important step forward to provide such essential insights in that we identified novel genes contributing to host susceptibility, host defences as well nonhost resistance to aphids.
2015-05-01 | E-MTAB-3223 | biostudies-arrayexpress
Project description:In this experiment we measured the transcriptional response of tomato plants (cv “Money maker”) when attacked belowground by the nematode M. inognita and, subsequently, aboveground by different (and common for this crop) biotic agents. Three weeks-old plants were exposed to nematodes for 5 days. At the fifth day the terminal leaflet of one of the first two true leaves was infected with the Cauliflower Mosaic Virus, or with the pathogen, or with the potato aphid Macrosiphum euphorbiae, or with the CMV-infected M. euphorbiae. For each belowground/aboveground combination treatment a set of control plants that received only the aboveground treatment was prepared. The infected leaflets of 5 biological replicates, each consisting of 1 plant, were collected 1, 2, 3, 4, 5 and 6 days after the onset of the aboveground treatment and flash frozen in liquid nitrogen. A different set of plants was used for every time point. Corresponding leaves from plants that did not receive any aboveground treatment (control) were selected and sampled as described above. Three biological replicates were selected among the five for RNA isolation. Total RNA was sent for sequencing to BGI Hong Kong.
2023-07-30 | E-MTAB-11956 | biostudies-arrayexpress
Project description:The aim of this study is to identify Arabidopsis genes whose expression is altered by aphid feeding. An understanding of the plant aphid interaction at the level of the plant transcriptome will 1) consolidate current areas of investigation focused on the phloem composition (the aphid diet), 2) open up areas of plant aphid interactions for ourselves and other workers, 3) Contribute to understanding the use of new molecular technologies in an environmental context and 4) contribute to existing and development of novel control strategies.Our Arabidopsis/Myzus persicae system provides a valuable model for the study because of: a) the advantages of using Arabidopsis, b) The ability to use clonal insects, c) phloem feeding aphids facilitate focus on a specific cell type, d) aphid stylectomy allows collection of pure phloem sap to monitor ?phloem phenotype?? of the plant and the insect diet, e) we have techniques to monitor the reproductive performance and feeding behaviour aphids.Our strategy has been to test the function of selected genes, particularly those regulating phloem composition (the feeding site of the aphid) based on current phloem models of phloem function. Gene choice is limited the simplicity of current models of phloem aphid interaction.We propose a simple two treatment (aphid infested vs control plants) experiment that will identify novel target genes for future analysis. Arabidopsis plants (variety Columbia) will be grown in 16/8 light/dark in temperature controlled growth rooms. At growth stage 3.90, when rosette growth is complete, 10 clonal adult Myzus persicae will be caged in clip cages on the two largest leaves on each plant. Control plants will be treated identically except that the cages will be empty. Leaves will be harvested 8 h after infestation. This time point is selected as we know that 90% of aphids are plugged into the sieve element within 2h and that a 6h lag phase has period has previously been used when examining gene expression affected by wounding. In subsequent experiments we will examine time courses of expression of relevant genes using other approaches. Pooling two leaves from each of ten plants will generate the RNA sample, ensuring that expression signals are representative of the population of plants. Experiment Overall Design: Number of plants pooled:10
2008-06-14 | E-GEOD-6172 | biostudies-arrayexpress
Project description:Aphids, sap-sucking insects in the order Hemiptera, are among the most prolific insect vectors of plant viruses Plant viruses from the family Luteoviridae are transmitted exclusively by aphids in a circulative manner and cause significant crop yield losses. Circulative plant viruses must cross the aphid gut and other tissues prior to transmission to a new host plant. The discovery of proteins that control acquisition and transmission in the insect vector is the biggest challenge for the vector biology field and will have practical applications for growers by providing new molecular targets for the development of precision vector management tools. The green peach aphid, Myzus persicae, is a vector of the Potato leafroll virus (PLRV), a polerovirus in the Luteoviridae. PLRV transmission efficiency was significantly reduced when a clonal lineage of M. persicae was reared on turnip (T-Myzus) as compared to the weed physalis (P-Myzus). The effect on PLRV transmission efficiency was transient and caused by a host-switch response. Using 2-D DIGE, we revealed that the major difference in the proteome profile of P- and T-Myzus was the lysosomal cysteine protease cathepsin B, with multiple size and charge isoforms of this enzyme up-regulated in T-Myzus. Quantitative, shotgun proteomics revealed a specific upregulation in the expression of other lysosomal proteins in T-Myzus as compared to P-Myzus, including cathepsin B, cathepsin B-16, beta-glucuronidase, peroxidasin, legumain-like, and aminopeptidase-N. The titer of PLRV was over 1.5 fold higher in P-Myzus than in T-Myzus at 24h and 72h after the beginning of virus acquisition, suggesting that virus acquisition in P-Myzus was more efficient. Cathepsin B and PLRV localization were starkly different in P- and T-Myzus midguts, the site of PLRV acquisition into the insect. In P-Myzus midguts, an abundance of PLRV was observed inside midgut cells, and cathepsin B was sequestered in a subcellular compartment. In contrast, there is near complete co-localization of cathepsin B and PLRV at the cell membranes in viruliferous T-Myzus. Inhibition of cathepsin and other cysteine proteases with E64 restored the ability of T-Myzus to transmit PLRV in a dose-dependent manner, suggesting that the activities of lysosomal cysteine proteases at the cell membrane in T-Myzus is responsible for the change in virus transmission phenotype in these aphids. T-Myzus individuals weighed more and had more progeny than P-Myzus individuals. These data are all consistent with the hypothesis that there is an induction of lysosomal exocytos in the midgut of T-Myzus linked to the ability of the aphid to acquire PLRV. These data also show that the ability of the generalist aphid M. persicae to transmit PLRV is influenced by the host plant the aphids are reared on, information that is useful to growers for polerovirus management in field crops.
2016-12-14 | PXD004893 | Pride
Project description:Myzus persicae (green peach aphid) feeding on Arabidopsis thaliana induces a defense response, quantified as reduced aphid progeny production, in infested leaves but not in other parts of the plant. Similarly, infiltration of aphid saliva into Arabidopsis leaves causes only a local increase in aphid resistance. Further characterization of the defense-eliciting salivary components indicates that Arabidopsis recognizes a proteinaceous elicitor with a size between 3 to 10 kD. Genetic analysis using well-characterized Arabidopsis mutant shows that saliva-induced resistance against M. persicae is independent of the known defense signaling pathways involving salicylic acid, jasmonate, and ethylene. Among 78 Arabidopsis genes that were induced by aphid saliva infiltration, 52 had been identified previously as aphid-induced, but few are responsive to the well-known plant defense signaling molecules salicylic acid and jasmonate. Quantitative PCR analysis confirms expression of saliva-induced genes. In particular, expression of a set of O-methyltransferases, which may be involved in the synthesis of aphid-repellent glucosinolates, was significantly up-regulated by both M. persicae feeding and treatment with aphid saliva. However, this did not correlate with increased production of 4-methoxyindol-3-ylmethylglucosinolate, suggesting that aphid salivary components trigger an Arabidopsis defense response that is independent of this aphid-deterrent glucosinolate. Experiment Overall Design: 3 biological replicates (control and treatment). Total number of samples: 6.
2009-06-23 | E-GEOD-16497 | biostudies-arrayexpress