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130 results for “Fraxinus excelsior”
Data from: Adaptive potential of ash (Fraxinus excelsior) populations against the novel emerging pathogen Hymenoscyphus pseudoalbidus
An emerging infectious pathogen Hymenoscyphus pseudoalbidus has spread across much of Europe within recent years causing devastating damage on European common ash trees (Fraxinus excelsior) and associated plant communities. The present study demonstrates the presence of additive genetic variation in susceptibility of natural F. excelsior populations to the new invasive disease. We observe high levels of additive variation in the degree of susceptibility with relatively low influence of environmental factors (narrow sense heritability = 0.37-0.52). Most native trees are found highly susceptible, and we estimate that only around 1% has the potential of producing offspring with expected crown damage of less than 10% under the present disease pressure. The results suggest that the presence of additive genetic diversity in natural F. excelsior populations can confer the species with important ability to recover, but that low resistance within natural European populations is to be expected due to a low frequency of the hypo-sensitive trees. Large effective population sizes will be required to avoid genetic bottlenecks. The role of artificial selection and breeding for protection of the species is discussed based on the findings.
Fig. 3 in Diplofuranoxin, a disubstituted dihydrofuranone, was produced together with sphaeropsidin A and epi-sphaeropsidone by Diplodia subglobosa, an emerging ash (Fraxinus excelsior L.) pathogen in Europe
Fig. 3. Comparison between experimental ECD spectrum (solid red line) of 1 with calculated ECD spectra [TDDFT/CAM-B3LYP/aug-cc-pvtz/IEFPCM(MeCN)] for (Z) stereoisomers Z-1a,b (blue dashed line) and their enantiomers ent-Z-1a,b (green dashed line). Panel (a) (3Z,5S,7S,8S)-Z-1a; panel (b) (3Z,5S,7S,8R)-Z-1b. Conformers population computed at DFT/B3LYP/6–311++G(d,p)/IEFPCM(MeCN) level. For a better spectral comparison computed spectra are shifted of +25 nm. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 1 in Diplofuranoxin, a disubstituted dihydrofuranone, was produced together with sphaeropsidin A and epi-sphaeropsidone by Diplodia subglobosa, an emerging ash (Fraxinus excelsior L.) pathogen in Europe
Fig. 1. Structure and assigned absolute configuration (see text) of diplofuranoxin (1) and that of the already known phytotoxic metabolites sphaeropsidins A and C (2 and 3), epi-sphaeropsidone (4) mellein and cis- and trans-4- hydroxy melleins (5–7).
Data from: Adaptive potential of ash (Fraxinus excelsior) populations against the novel emerging pathogen Hymenoscyphus pseudoalbidus
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Fraxinus excelsior L. (BR0000012130191)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000024840651)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000008681447)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. var. diversifolia Aiton (BR0000012315208)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000012131259)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000012131839)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. var. diversifolia Aiton (BR0000012563388)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000005252671)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000012130818)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000012214884)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000006448493)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000006890308)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000012315277)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000012130290)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000024840606)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Fraxinus excelsior L. (BR0000012130566)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
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