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7 results for “knapweed”
Genomic analyses of phenotypic differences between native and invasive populations of diffuse knapweed (Centaurea diffusa)
<p>Invasive species represent excellent opportunities to study the evolutionary potential of traits important to success in novel environments. Although some ecologically-important traits have been identified in invasive species, little is typically known about the genetic mechanisms that underlie invasion success in non-model species. Here, we use a genome-wide association (GWAS) approach to identify the genetic basis of trait variation in the non-model, invasive, diffuse knapweed (<i>Centaurea diffusa </i>Lam.<i> </i>[Asteraceae]). To assist with this analysis, we have assembled the first draft genome reference and fully annotated plastome assembly for this species, and the one of the first from this large, weedy, genus, which is of major ecological and economic importance. We collected phenotype data from 372 individuals from four native and four invasive populations of <i>C. diffusa </i>grown in a common environment. Using these individuals, we produced reduced-representation genotype-by-sequencing (GBS) libraries and identified 7058 SNPs. We identify two SNPs associated with leaf width in these populations, a trait which significantly varies between native and invasive populations. In this rosette forming species, increased leaf width is a major component of increased biomass, a common trait in invasive plants correlated with increased fitness. Finally, we use annotations from <i>Arabidopsis thaliana</i> to identify 98 candidate genes that are near the associated SNPs and highlight several good candidates for leaf width variation.</p>
Fig. 1 in Spread of Larinus minutus (Coleoptera: Curculionidae), a biological control agent of knapweeds, following introduction to northwestern Arkansas
Fig. 1. Percentage of infested capitula (A) and spread rate (B) of Larinus minutus populations on spotted knapweed from the release point at each of 5 release sites in northwest Arkansas as modeled by the exponential decay function: y = Ae-Bx
Genomic analyses of phenotypic differences between native and invasive populations of diffuse knapweed (Centaurea diffusa)
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Fig. 5 in Biocontrol Agents Cross Borders: First Detection of the Knapweed Seed Head Weevil, Bangasternus fausti (Reitter) (Coleoptera: Curculionidae), in Canada
Fig. 5. Maximum-likelihood gene tree of Bangasternus, Rhinocyllus, and Larinus cytochrome c oxidase subunit I sequences. Black circles indicate 100% support with SH-aLRT ratios/ultrafast bootstrapping and gray circles indicate greater than 70% support. Dark red labels depict identified specimens from the William F. Barr Entomological Museum at the University of Idaho.
Figs. 2–4 in Biocontrol Agents Cross Borders: First Detection of the Knapweed Seed Head Weevil, Bangasternus fausti (Reitter) (Coleoptera: Curculionidae), in Canada
Figs. 2–4. Adult Bangasternus fausti (sensu Colonnelli and Whitehead 1990) from British Columbia, Canada. 2) Lateral habitus; 3) Dorsal habitus; 4) Male genitalia, dorsal view. Specimen in Figs. 2–3 from Peachland, British Columbia, Canada (49.739669, −119.769512), collected 27 June 2022 on Centaurea diffusa. Specimen in Fig. 4 from Kelowna, British Columbia, Canada (49.90889, −119.49167), collected 11 June 2022 on C. diffusa (specimen code Bf068). Photos by C. L. Cock.
Fig. 1. Search effort for Bangasternus between 2020–2022 in Biocontrol Agents Cross Borders: First Detection of the Knapweed Seed Head Weevil, Bangasternus fausti (Reitter) (Coleoptera: Curculionidae), in Canada
Fig. 1. Search effort for Bangasternus between 2020–2022. Symbol color represents presence or absence of B. fausti: white depicts presence, green depicts iNaturalist observations, and unfilled depicts absence. White triangles depict sites that had B. fausti and at least two species of Centaurea whereas unfilled triangles depict sites that had no B. fausti but had both C. diffusa and C. stoebe ssp. micranthos. Photo of B. fausti on C. diffusa by N. G. Earley. Figure prepared in QGIS version 3.16.6 with basemaps from https://github.com/stamen/terrain-classic and https://github.com/CartoDB/ basemap-styles.
Data from: Hybridization and invasion: an experimental test with diffuse knapweed (Centaurea diffusa Lam.)
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