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Metabarcoding shows multiple Phytophthora species associated with individual plant species: implications for restoration
European Journal of Plant Pathology ( IF 1.8 ) Pub Date : 2021-01-05 , DOI: 10.1007/s10658-020-02167-7
Jamba Gyeltshen , William A. Dunstan , Christopher Shaw , Kay Howard , Andrew H. Grigg , Giles E. St. J. Hardy , Treena I. Burgess

Severe tree decline in natural ecosystems around the world has driven Phytophthora research, resulting in a better understanding of the diversity and association of Phytophthora species with different host plants. Improved molecular techniques have contributed significantly to that understanding. The devastating impact of Phytophthora dieback in native vegetation in the southwest of Western Australia (SWWA) has motivated a committed research effort to understand the survival and spread of this pathogen. Hot, dry summers characterise the climate of this ecosystem, and are supposedly unfavourable for a moisture-loving pathogen to survive, spread and thrive. However, Phytophthora cinnamomi can survive within the roots of native plant species allowing for its persistence. Random plant sampling, with metabarcoding from root samples, revealed the presence of at least 23 Phytophthora species on 18 of the 20 plant species growing on mining stockpiles of the Huntly mine site (Alcoa of Australia Limited) in SWWA. Phytophthora cinnamomi was detected on 16 of the 20 plant species. This finding supports the idea that native plant species have a significant role in the survival and spread of P. cinnamomi in the environment. The presence of other Phytophthora species challenges the assumption that P. cinnamomi is the main cause of Phytophthora dieback; the disease may be complex, involving several Phytophthora species. These unexpected detections indicate that plants in the natural forest can serve as the reservoir of inoculum of not only P. cinnamomi but also for other Phytophthora species.



中文翻译:

元条形码显示了与单个植物物种相关的多种疫霉菌:对恢复的影响

全世界自然生态系统中严重的树木砍伐推动了疫霉菌的研究,从而使人们对疫霉菌物种与不同寄主植物的多样性和联系有了更好的了解。改进的分子技术大大促进了这种理解。疫霉菌对西澳大利亚州西南部的天然植被造成的毁灭性影响激发了致力于研究的努力,以了解这种病原体的生存和传播。炎热干燥的夏季是这个生态系统的气候特征,据说不利于喜欢水分的病原体生存,传播和繁殖。但是,疫霉菌可以在本地植物物种的根部生存,从而使其持久存在。随机植物采样,以及根样品的metabarcode分析显示,西南SWWA的Huntly矿场(澳大利亚铝业有限公司)的采矿库存上生长的20种植物中有18种存在至少23种霉菌。在20种植物中的16种中检出了疫霉。这一发现支持了这样的想法,即本地植物物种在环境中对P. cinnamomi的存活和传播具有重要作用。其他疫霉菌物种的存在挑战了P. cinnamomi疫霉菌的主要原因的假设消亡 该病可能很复杂,涉及几种疫霉菌。这些意想不到的发现表明,天然林中的植物不仅可以作为肉桂疫霉菌的接种物,还可以作为其他疫霉菌的接种物。

更新日期:2021-01-05
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