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首页> 外文期刊>Plant Disease >Root Rot of Juniperus and Microbiota by Phytophthora lateralis in Oregon Horticultural Nurseries
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Root Rot of Juniperus and Microbiota by Phytophthora lateralis in Oregon Horticultural Nurseries

机译：Juniperus和Microbiota的根腐烂是俄勒冈州俄勒冈州园林苗圃的植物疗法

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摘要

Widespread symptoms of root rot and mortality on Juniperus communis and Microbiota decussata were observed in two horticultural nurseries in Oregon, leading to the isolation of a Phytophthora sp. from diseased roots. Based on morphology and sequencing the internal transcribed spacer ITS1-5.8S-ITS2 region, isolates were identified as the invasive pathogen Phytophthora lateralis, causal agent of Port-Orford-cedar (POC; Chamaecyparis lawsoniana) root disease. Additional sequencing of the cytochrome c oxidase subunit 1 and 2 genes identified all isolates as belonging to the PNW lineage. Utilizing recovered isolates plus a POC-wildlands isolate and susceptible POC as controls, we completed Kochs postulates on potted Juniperus and Microbiota plants. Nursery isolates were more aggressive than the forest isolate, which was used in the POC resistance breeding program. Increased aggressiveness was confirmed using a branch stem dip assay with four POC clones that differed in resistance, although no isolate completely overcame major-gene resistance. Isolates were sensitive to mefenoxam, a fungicide commonly used to suppress Phytophthora spp. growth in commercial nurseries. Although POC resistance is durable against these more aggressive nursery isolates, the expanded host range of P. lateralis challenges POC conservation through the continued movement of P. lateralis by the nursery industry.
机译：在俄勒冈州两种园艺苗圃中观察到​​杜松术治疗和微生物瘤Decussata的普遍腐败和死亡率的普遍症状，导致植物分离植物。来自患病根。基于形态和测序内部转录的间隔液1-5.8S-ITS2区，分离株被鉴定为侵入病原菌植物植物肺肠左侧，奥福德 - 雪松（POC; Chamaecyparis Lawsoniana）根病。细胞色素C氧化酶亚基1和2基因的额外测序鉴定了属于PNW谱系的所有分离物。利用恢复的分离株加上PoC-Wildlands分离和敏感的POC作为对照，我们完成了Kochs Postulates on Potted Juniperus和Microbiota植物。苗圃分离物比森林分离物更具侵略性，这些抗植物分离物用于POC抵抗育种计划。使用分支茎浸法测定具有增加的抗性耐受性，耐受抗性的四种POC克隆，尽管没有分离完全克服主要基因抗性，但确认了增加的侵袭性。分离物对mefenoxam敏感，常用于抑制植物阵挛的杀菌剂。商业托儿所的增长。虽然POC抗性对这些更具侵略性的苗圃分离株进行了耐用，但通过苗圃行业的P. Lastalis的持续运动，P. Landeris的扩展宿主范围挑战PoC保护。

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