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56 results for “plant-parasitic nematodes”
Figure 9 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 9. Ancestral state reconstructions for the genus Hemicycliophora based on parsimony (left maximum parsimony tree) and Bayesian inference (BI; right: BI tree) of A, average body length; B, average stylet length; C, average R (total number of body annuli); D, average RV (number of annuli between posterior end of body and vulva). Posterior probabilities for each character state are indicated as pie charts in the majority consensus BI tree.
Figure 7 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 7. Phylogenetic relationships within populations and species of the genus Hemicycliophora as inferred from Bayesian analysis using the D2-D3 of the 28S rRNA gene sequence data set with the general time reversible substitution model with estimation of invariant sites and assuming a gamma distribution with four categories. Posterior probabilities of over 70% are given for appropriate clades. Newly obtained sequences are indicated in bold.
Figure 5 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 5. Photomicrographs of specimens of a Spanish population of Hemicycliophora obtusa Thorne, 1955. A, entire female body; B, female pharyngeal region; C, female anterior region; D, detail of lateral field; E, F, vulval and tail regions; G, pharyngeal region of pre-adult male showing absence of stylet; H, I, detail of spicules and bursa of pre-adult male. Scale bars: A = 100 μm; B, C, E–I = 20 μm; D = 10 μm.
Figure 3 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 3. Scanning electron microscope (SEM) micrographs of specimens of populations of selected Hemicycliophora species. A–D, lip region; E–L, lateral field. A, Hemicycliophora wyei (North Carolina, USA) (CD683); B, Hemicycliophora poranga (California, USA) (CD714); C, Hemicycliophora sp. 3 (Arizona, USA) (CD715); D, Hemicycliophora californica (California, USA) (CD826B); E, Hemicycliophora gracilis (California, USA) (CD45); F, H. wyei (North Carolina, USA) (CD679); G, H. californica (CD826B); H, H. wyei (CD683); I, H. poranga (CD714); J, Hemicycliophora sp. 3 (CD715); K, Hemicycliophora sp. 4 (North Carolina, USA) (CD675); L, H. californica CD826B). Scale bars: A–C, E, G–J, L = 5 μm; D = 2 μm; F, K = 10 μm.
Figure 2 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 2. Photomicrographs of specimens of populations of selected Hemicycliophora species. A–E, anterior region; F–J, lateral field: K–O, posterior region. A, F, K, Hemicycliophora floridensis (topotype, Florida, USA); B, G, L, Hemicycliophora poranga (California, USA); C, H, M, Hemicycliophora sp. 11 (Florida, USA), D, I, N, Hemicycliophora sp. 4 (North Carolina, USA); E, J, O, Hemicycliophora wyei (North Carolina, USA). Scale bars: A–E, K–O = 10 μm; F–J = 5 μm.
Figure 4 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 4. Photomicrographs of specimens of a new Spanish population of Hemicycliophora iberica Castillo et al., 1989. A, entire female body; B, female pharyngeal region; C, female anterior region; D, posterior region; E, detail of lateral field; F–I, female tail tips. Scale bars: A = 100 μm; B–D, F–I = 20 μm; E = 10 μm. ep, excretory pore.
Figure 1 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 1. Photomicrographs of specimens of populations of selected Hemicycliophora species. A–F, anterior region; G–L, lateral field; M–R, posterior region. A, G, M, Hemicycliophora conida (Washington State, USA); B, H, N, Hemicycliophora sp. 3 (Arizona, USA); C, I, O, Hemicycliophora sp. 8 (California, USA); D, J, P, Hemicycliophora raskii (California, USA); E, K, Q, Hemicycliophora sp. 10 (California, USA); F, L, R, Hemicycliophora californica (California, USA). Scale bars: A–F, M–R = 10 μm; G–L = 5 μm.
Figure 8 in Molecular phylogeny, diagnostics, and diversity of plant-parasitic nematodes of the genus Hemicycliophora (Nematoda: Hemicycliophoridae)
Figure 8. Phylogenetic relationships within populations and species of the genus Hemicycliophora as inferred from Bayesian analysis using the internal transcribed spacer rRNA gene sequence data set with the general time reversible substitution model with estimation of invariant sites and assuming a gamma distribution with four categories. Posterior probabilities of over 70% are given for appropriate clades. Newly obtained sequences are indicated in bold.
PPND: a comprehensive genomic data platform for plant-parasitic nematode research
<p>Plant parasitic nematodes are important phytopathogens, they harm the growth of agricultural and forestry plants for a long time. Scientists have done a series of studies on them to prevent and solve the diseases that they cause. With the advent of the genomics era, genome sequencing of plant parasitic nematodes has been greatly accelerated, and a large amount of data has been generated. This study developed the Plant Parasitic Nematodes Database (http://nematode.org.cn/), a platform to bring all these data together. The PPND contains genomic, transcriptomic, protein, and functional annotation data. It allows users to conduct BLAST searches, genome browser analyses, and download bioinformatics data for deeper research. PPND will be continuously updated, and new data will be integrated. We hope that the PPND will become a comprehensive genomic data platform for plant parasitic nematode research.</p>
PPND: a comprehensive genomic data platform for plant-parasitic nematode research
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Towards genetic modification of plant-parasitic nematodes: Delivery of macromolecules to male germlines and expression of exogenous mRNA in second stage juveniles
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Data from: Gene copy number variations as signatures of adaptive evolution in the parthenogenetic, plant-parasitic nematode Meloidogyne incognita
Adaptation to changing environmental conditions represents a challenge to parthenogenetic organisms and until now, how phenotypic variants are generated in clones in response to the selection pressure of their environment remains poorly known. The obligatory parthenogenetic root-knot nematode species Meloidogyne incognita has a worldwide distribution and is the most devastating plant-parasitic nematode. Despite its asexual reproduction, this species exhibits an unexpected capacity of adaptation to environmental constraints, e.g., resistant hosts. Here we used a genome-wide comparative hybridization strategy to evaluate variations in gene copy numbers between genotypes of M. incognita resulting from two parallel experimental evolution assays on a susceptible vs. resistant host plant. We detected gene copy number variations (CNVs) associated with the ability of the nematodes to overcome resistance of the host plant, and this genetic variation may reflect an adaptive response to host resistance in this parthenogenetic species. The CNV distribution throughout the nematode genome is not random and suggests the occurrence of genomic regions more prone to undergo duplications and losses in response to the selection pressure of the host resistance. Furthermore, our analysis revealed an outstanding level of gene loss events in nematode genotypes that have overcome the resistance. Overall, our results support the view that gene loss could be a common class of adaptive genetic mechanism in response to a challenging new biotic environment in clonal animals.
Data from: Gene copy number variations as signatures of adaptive evolution in the parthenogenetic, plant-parasitic nematode Meloidogyne incognita
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Data from: The transcriptome of Nacobbus aberrans reveals insights into the evolution of sedentary endoparasitism in plant-parasitic nematodes
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Data from: Tracking changes in life-history traits related to unnecessary virulence in a plant-parasitic nematode
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High-resolution single-nematode transcriptomic datasets of plant-parasitic nematodes from juveniles to adults
GEO Series GSE315311. Meloidogyne incognita. 75 samples. Type: Expression profiling by high throughput sequencing.
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International Brain Laboratory public data
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OpenNeuro
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