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Oomycetes in rhizosphere soil of ornamental plants from retail nurseries in Southern Sweden
Forest Pathology ( IF 1.4 ) Pub Date : 2021-01-26 , DOI: 10.1111/efp.12673
Michelle Cleary 1 , Mimmi Blomquist 1 , Marylise Marchand 2 , Johanna Witzell 1
Affiliation  

Trade of herbaceous and woody ornamental plants is recognized as a principal pathway for the introduction of alien plant pathogens, such as soil‐borne Phytophthora and Pythium species (oomycetes). The rhizosphere soil of container‐grown plants obtained from 13 nurseries and garden centres in southern Sweden were sampled and the presence of Phytophthora and Pythium species determined using traditional baiting and isolation. DNA sequencing of isolates revealed five Phytophthora taxa including P. cinnamomi, P. citricola s.l., P. plurivora, P. undulata and a non‐identified Phytophthora sp., as well as Phytopythium cf. citrinum and several species of Pythium. Phytophthora cinnamomi was detected on two different ornamental plants at the same nursery and is a first record of P. cinnamomi in Sweden. The survey revealed that a diversity of potentially pathogenic oomycetes is associated with ornamental plants available for sale in Sweden and emphasizes the need to recognize potential risks if these organisms get introduced in nature.

中文翻译:

瑞典南部零售苗圃的观赏植物根际土壤中的卵菌纲

草本和木本观赏植物的贸易被认为是引入外来植物病原体(例如土传疫霉菌腐霉菌属物种(卵菌))的主要途径。对从瑞典南部的13个苗圃和花园中心获得的容器生长植物的根际土壤进行了采样,并使用传统诱饵和隔离技术测定了疫霉属腐霉属的存在。分离物的DNA测序揭示5个类群包括肉桂疫霉P.蚜SL,P. plurivoraP. undulata和非标识的sp。,以及Phytopythium cf .。柠檬黄腐霉属的几种。在同一苗圃中的两种不同观赏植物上都检出了疫霉菌,这是瑞典的P. cinnamomi的第一个记录。调查显示,潜在致病的卵菌有多种可能与瑞典出售的观赏植物有关,并强调如果将这些生物引入自然界,就必须认识到潜在的风险。
更新日期:2021-01-26
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