Transcript data affected by natural variation or PME17 mutation in Arabidopsis thaliana, infested or not with the aphid Myzus persicae
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ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE80749 | GEO | 2019/04/01
REPOSITORIES: GEO
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Project description:The green peach aphid, Myzus persicae Sulzer, is a notorious pest on vegetables, which often aggregates in high densities on crop leaves. In this study, we investigated whether M. persicae could suppress the resistance level of Chinese cabbage Brassica pekinensis. M. persicae performed better in terms of weight gain (~33% increase) and population growth (~110% increase) when feeding on previously infested (pre-infested) Chinese cabbage compared with those on non-infested plants. However, when given a choice, 64% of the aphids preferred to settle on non-infested leaves, while 29% of aphids chose pre-infested leaves that had a 2.9 times higher concentration of glucosinolates. Aphid feeding significantly enhanced the amino acid:sugar ratio of phloem sap and the absolute amino acid concentration in plant leaves. Aphid infestation significantly increased the expression levels of salicylic acid (SA) marker genes, while it had marginal effects on the expression of jasmonate marker genes. Exogenously applied SA or methyl jasmonate had no significant effects on M. persicae performance, although these chemicals increased glucosinolates concentration in plant leaves. M. persicae infestation increase amino acid:sugar ratio and activate plant defenses, but aphid performed better on pre-infested plants, suggesting that both nutrition and toxics should be considered in insect-plant interaction.
| S-EPMC4764936 | biostudies-literature
Project description:Reference: De Vos and Jander, 2009 - Plant, Cell, and Environment Aim: Identification of genes responding to aphid saliva. Background: During feeding on phloem sap aphids repeatedly salivate into the sieve element. It is thought that compounds in aphid saliva play a role in sustainable feeding. These compounds may include proteins and small molecules, which can function as virulence factors. Growth conditions Plants: Seeds of wild-type Arabidopsis thaliana (Col-0) were obtained from the were kept in 0.1% Phytagar (Invitrogen, Carlsbad, CA) for 24 h at 4°C prior to planting on Cornell mix with Osmocoat fertilizer. Plants were grown in Conviron growth chambers in 20- x 40-cm nursery flats at a photosynthetic photon flux density of 200 mmol m-2 s-1 and a 16-h photoperiod. The temperature in the chambers was 23°C and the relative humidity was 50%. Plants were grown for 3 weeks and used in experiments before flowering. Aphids: All experiments were conducted with a tobacco-adapted red lineage of M. persicae. Aphids were raised on cabbage (Brassica oleracea) with a 16-h day (150 mmol m-2 s-1 at 24°C) and an 8-h night (19°C) at 50% relative humidity. Experimental set-up/treatment: Fifty aphids were allowed to feed from 50 µL artificial diet, containing sucrose and amino acids (Kim and Jander, 2007) between two layers of Parafilm. After 24 h, artificial diet from 20 aphids and control (0 aphids) diet cups was collected and infiltrated into leaves of intact Arabidopsis plants using a 1-mL syringe without the needle. Plants for control diet and aphid saliva containing diet were grown in the same pot to allow for a paired comparison. Eighteen leaves (3 leaves from 6 plants) treated with control and aphid saliva containing diet were harvested and immediately frozen in liquid nitrogen. This experiment was repeated 3 times to function as independent biological replicates. RNA extraction + processing: RNA was extracted using the Qiagen Plant RNeasy kit. RNA quality and quantity was assessed with an Agilent BioAnalyser 2100. Samples were processed by the Cornell Microarray facility. Whole genome gene expression profiling was done using Affymetrix ATH1 GeneChips. Data analysis: Raw data from the microarrays was normalized at probe-level using gcRMA algorithm. The detection calls (present, marginal, absent) for each probe set was obtained using the GCOS system. Significance of gene expression was determined using the LIMMA (Smyth, 2004) program and raw p values of multiple tests were corrected using False Discovery Rate (FDR).
2009-11-12 | GSE18960 | GEO
Project description:BACKGROUND:The green peach aphid (GPA), Myzus persicae, is economically one of the most threatening pests in pepper cultivation, which not only causes direct damage but also transmits many viruses. Breeding aphid resistant pepper varieties is a promising and environmentally friendly method to control aphid populations in the field and in the greenhouse. Until now, no strong sources of resistance against the GPA have been identified. Therefore the main aims of this study were to identify pepper materials with a good level of resistance to GPA and to elucidate possible resistance mechanisms. RESULTS:We screened 74 pepper accessions from different geographical areas for resistance to M. persicae. After four rounds of evaluation we identified one Capsicum baccatum accession (PB2013071) as highly resistant to M. persicae, while the accessions PB2013062 and PB2012022 showed intermediate resistance. The resistance of PB2013071 resulted in a severely reduced uptake of phloem compared to the susceptible accession, as determined by Electrical Penetration Graph (EPG) studies. Feeding of M. persicae induced the expression of callose synthase genes and resulted in callose deposition in the sieve elements in resistant, but not in susceptible plants. CONCLUSIONS:Three aphid resistant pepper accessions were identified, which will be important for breeding aphid resistant pepper varieties in the future. The most resistant accession PB2013071 showed phloem-based resistance against aphid infestation.
| S-EPMC6020309 | biostudies-literature
Project description:The green peach aphid (Myzus persicae) is a phloem-feeding insect that causes economic damage on a wide array of crops. Using a luminol-based assay, a superoxide-responsive reporter gene (Zat12::luciferase), and a probe specific to hydrogen peroxide (HyPer), we demonstrated that this aphid induces accumulation of reactive oxygen species (ROS) in Arabidopsis thaliana. Similar to the apoplastic oxidative burst induced by pathogens, this response to aphids was rapid and transient, with two peaks occurring within 1 and 4 hr after infestation. Aphid infestation also induced an oxidative response in the cytosol and peroxisomes, as measured using a redox-sensitive variant of green fluorescent protein (roGFP2). This intracellular response began within minutes of infestation but persisted 20 hr or more after inoculation, and the response of the peroxisomes appeared stronger than the response in the cytosol. Our results suggest that the oxidative response to aphids involves both apoplastic and intracellular sources of ROS, including ROS generation in the peroxisomes, and these different sources of ROS may potentially differ in their impacts on host suitability for aphids.
| S-EPMC8126190 | biostudies-literature
Project description:Aphids are amongst the most devastating sap-feeding insects of plants. Like most plant parasites, aphids require intimate associations with their host plants to gain access to nutrients. Aphid feeding induces responses such as clogging of phloem sieve elements and callose formation, which are suppressed by unknown molecules, probably proteins, in aphid saliva. Therefore, it is likely that aphids, like plant pathogens, deliver proteins (effectors) inside their hosts to modulate host cell processes, suppress plant defenses, and promote infestation. We exploited publicly available aphid salivary gland expressed sequence tags (ESTs) to apply a functional genomics approach for identification of candidate effectors from Myzus persicae (green peach aphid), based on common features of plant pathogen effectors. A total of 48 effector candidates were identified, cloned, and subjected to transient overexpression in Nicotiana benthamiana to assay for elicitation of a phenotype, suppression of the Pathogen-Associated Molecular Pattern (PAMP)-mediated oxidative burst, and effects on aphid reproductive performance. We identified one candidate effector, Mp10, which specifically induced chlorosis and local cell death in N. benthamiana and conferred avirulence to recombinant Potato virus X (PVX) expressing Mp10, PVX-Mp10, in N. tabacum, indicating that this protein may trigger plant defenses. The ubiquitin-ligase associated protein SGT1 was required for the Mp10-mediated chlorosis response in N. benthamiana. Mp10 also suppressed the oxidative burst induced by flg22, but not by chitin. Aphid fecundity assays revealed that in planta overexpression of Mp10 and Mp42 reduced aphid fecundity, whereas another effector candidate, MpC002, enhanced aphid fecundity. Thus, these results suggest that, although Mp10 suppresses flg22-triggered immunity, it triggers a defense response, resulting in an overall decrease in aphid performance in the fecundity assays. Overall, we identified aphid salivary proteins that share features with plant pathogen effectors and therefore may function as aphid effectors by perturbing host cellular processes.
| S-EPMC2987835 | biostudies-literature
Project description:STN7-dependent phosphorylation of an as yet unknown thylakoid protein triggers the signaling events associated with the long-term acclimatory response (LTR). The LTR-associated signaling events regulate the expression of photosynthesis-related genes on the post-transcriptional level (nucleus), as indicated by transcript profiling in LTR mutants. 5 µg of total RNA of two to three biological replicates of the different pools (10 plants each pool) of rosette leaves of 4-week-old Col-0, Wassilewskija, stn7-1, psad1-1, stn7-1 psad1-1, psae1-3 and stn7-1 psae1-3 plants was processed and hybridized to a GeneChip Arabidopsis ATH1 Genome Array using the One-Cycle Target Labeling and Control Reagents according to the manufacturer’s instructions (Affymetrix); psad1 (2 replicates) psad1 stn7 (3 replicates) Col-0 (3 replicates) Ws (2 replicates) psae (2 replicates) psae stn7 (2 replicates) stn7 (3 replicates)
2009-06-01 | E-GEOD-15939 | biostudies-arrayexpress
Project description:KMD is genetically engenered to be highly resistant to lepidopteran pests through expressing a synthetic cry1Ab gene and its parent non-transgenic rice is Xiushui 11.The developmental duration of BPH feeding on KMD2 was significantly delayed. And moreover, the fecundity of BPH was significantly lower when fed on Bt rice than on the non-Bt parental plants.To investigate unintended effects in KMD2 that causes changes in BPH performance, we performed microarray (GeneChip) analysis to compare the gene expression profiles between Bt rice and non-transgenic parental plants in response to BPH infestation. We used microarrays to detect Bt-independent variation, which might render Bt rice more defensive or less nutritious to BPH. For BPH treatment, 10 second-instar nymphs were infested onto each 30-day-old seedling. After 72 h, the BPH nymphs were carefully removed and rice shoots of both BPH-infested and non-infested plants were sampled for microarray analysis. There were four treatments: Xiushui 11-non infested, Xiushui 11-BPH infested, KMD2-non infested, KMD2-BPH infested, three biological replications.
2015-11-06 | E-GEOD-74745 | biostudies-arrayexpress
Project description:Transcriptional profiling of arsenic-induced toxicity and tolerance in Arabidopsis plants of different ecotypes Arsenic (As) is a toxic metalloid found ubiquitously in the environment and has widely been known as an acute poison and carcinogen. As toxicity is a major factor leading to root growth inhibition in plants. However, the molecular mechanisms of plants in response to As has not been extensively characterized. In this study, Arabidopsis ecotypes that are As-tolerant (Col-0) and -sensitive (Ws-2) were used to conduct a transcriptome analysis of the response to As (V). To begin elucidating the molecular basis of As toxicity and tolerance in Arabidopsis, seedlings of Col-0 and Ws-2 were subjected to As treatment. The root elongation rate of Col-0 was significantly higher than that of Ws-2 when exposed to As. The tolerant ecotype (Col-0) demonstrated lower accumulation of As when compared to the responses observed in the sensitive Ws-2. Subsequently, the effect of As exposure on genome-wide gene expression was examined in the two ecotypes. Comparative analysis of microarray data identified groups of genes with common and specific responses to As between Col-0 and Ws-2. The genes related to heat responses and oxidative stresses belonged to common responses, indicating conserved stress-associated changes across two ecotypes. The majority of specific responsive genes were those encoding heat shock proteins, heat shock factors, ubiquitin and transporters. The data suggested that metal transport and maintenance of protein structure may be important mechanisms for toxicity and tolerance to As. This study presents comprehensive surveys of global transcriptional regulation and identifies stress- and tolerance-associated genes in response to As.
2011-11-26 | GSE31977 | GEO
Project description:This SuperSeries is composed of the SubSeries listed below.
2010-02-23 | GSE18659 | GEO
Project description:The evolution of resistance to insecticides threatens the sustainable control of many of the world's most damaging insect crop pests and disease vectors. To effectively combat resistance, it is important to understand its underlying genetic architecture, including the type and number of genetic variants affecting resistance and their interactions with each other and the environment. While significant progress has been made in characterizing the individual genes or mutations leading to resistance, our understanding of how genetic variants interact to influence its phenotypic expression remains poor. Here, we uncover a mechanism of insecticide resistance resulting from transposon-mediated insertional mutagenesis of a genetically dominant but insecticide-susceptible allele that enables the adaptive potential of a previously unavailable recessive resistance allele to be unlocked. Specifically, we identify clones of the aphid pest Myzus persicae that carry a resistant allele of the essential voltage-gated sodium channel (VGSC) gene with the recessive M918T and L1014F resistance mutations, in combination with an allele lacking these mutations but carrying a Mutator-like element transposon insertion that disrupts the coding sequence of the VGSC. This results in the down-regulation of the dominant susceptible allele and monoallelic expression of the recessive resistant allele, rendering the clones resistant to the insecticide bifenthrin. These findings are a powerful example of how transposable elements can provide a source of evolutionary potential that can be revealed by environmental and genetic perturbation, with applied implications for the control of highly damaging insect pests.
| S-EPMC8201860 | biostudies-literature