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首页> 外文期刊>Journal of Experimental Botany >Canditate metabolites for ash dieback tolerance in Fraxinus excelsior
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Canditate metabolites for ash dieback tolerance in Fraxinus excelsior

机译：Fraxinus Excelsior的灰烬沉淀耐受性的候选代谢产物

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摘要

Ash dieback, a forest epidemic caused by the invasive fungus Hymenoscyphus fraxineus, threatens ash trees throughout Europe. Within Fraxinus excelsior populations, a small proportion of genotypes show a low susceptibility to the pathogen. We compared the metabolomes from a cohort of low-susceptibility ash genotypes with a cohort of high-susceptibility ash genotypes. This revealed two significantly different chemotypes. A total of 64 candidate metabolites associated with reduced or increased susceptibility in the chemical families secoiridoids, coumarins, flavonoids, phenylethanoids, and lignans. Increased levels of two coumarins, fraxetin and esculetin, were strongly associated with reduced susceptibility to ash dieback. Both coumarins inhibited the growth of H. fraxineus in vitro when supplied at physiological concentrations, thereby validating their role as markers for low susceptibility to ash dieback. Similarly, fungal growth inhibition was observed when the methanolic bark extract of low-susceptibility ash genotypes was supplied. Our findings indicate the presence of constitutive chemical defense barriers against ash dieback in ash.
机译：Ash DieBack，由侵入性真菌Hymenoscyphus Fraxineus引起的森林流行病，威胁到欧洲整个灰烬。在Fraxinus Excelsior群体中，小比例的基因型显示出对病原体的易感性。将代谢物与高易感性灰分基因型队列的低易感性灰分基因型的代谢物进行比较。这揭示了两种显着不同的化学型。总共64个候选代谢物，其在化学家族Secoiridoids，香豆素，黄酮类化合物，苯乙醇和木质素中减少或增加易感性。增加了两种香豆素，阿弗林汀和ecculetin的水平强烈，与对灰沉降背面的易感性较低。在在生理浓度供应时，两种香豆素在体外抑制了F​​axineus的生长，从而验证了它们作为对灰度沉淀的低易感性的标记的作用。类似地，当供应低易感性灰分基因型的甲醇树皮提取物时，观察到真菌生长抑制。我们的研究结果表明，在灰烬中对抗灰烬的构成化学防御障碍。

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