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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Aphelenchoides hylurgi as a Carrier of White, Hypovirulent Ctyphonectria parasitica and its Possible Role in Hypovirulence Spread on Blight-Controlled American Chestnut Trees
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Aphelenchoides hylurgi as a Carrier of White, Hypovirulent Ctyphonectria parasitica and its Possible Role in Hypovirulence Spread on Blight-Controlled American Chestnut Trees

机译：Aphelenchoides hylurgi作为白色，低毒Ctyphonectria parasitica的携带者及其在疫病控制的美国栗树上传播的低毒力中的可能作用

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Individual nematodes were isolated from American chestnut blight-controlled cankers to determine if they were carriers of biocontrol (hypovirulent) isolates of the chestnut blight fungus, Cryphonectria parasitica. These hypovirulent isolates have a white fungal colony phenotype due to infection by the virus CHV1. Of 1,620 individual Aphelenchoides hylurgi isolated, 29.4% carried propagules of the blight fungus and 8.2% of these yielded white hypovirulent isolates. In attraction and movement tests inPetri plates, A. hylurgi moved 2 cm over 24 hr to mycelial discs of white hypovirulent C. parasitica and pigmented C. parasitica strains in nearly equal numbers. After 2 days of nematode movement to fungal colonies on agar in Petri plates and 21 days ofnematode growth, large numbers of A. hylurgiwere extracted from both white hypovirulent and pigmented C. parasitica strain colonies. Lower numbers of A. hylurgiwere extracted from excised young American chestnut blight cankers that were inoculated with A. hylurgi and incubated for 22 days. A. hylurgi inoculated on the surface of an excised American chestnut canker moved within 24 hr to the small, spore-bearing C. parasitica reproductive structures (stromata) on the canker surface. The results indicate that A. hylurgi may play a role in the spread of hypovirulence on American chestnut trees.
机译：从美国栗疫病控制的溃疡病菌中分离出单个线虫，以确定它们是否为栗疫病真菌Cryphonectria parasitica的生物控制（低毒力）分离株的携带者。这些低毒分离株由于被CHV1病毒感染而具有白色真菌菌落表型。在分离出的1,620个单独的Aphelenchoides hylurgi中，29.4％携带了枯萎真菌的繁殖体，其中8.2％产生了白色低毒分离株。在培养皿中进行吸引力和运动测试时，A。hylurgi在24小时内移动了2 cm，进入白色弱毒C. parasitica和有色C. parasitica菌株的菌丝体盘，数量几乎相等。将线虫移至培养皿中琼脂上的真菌菌落2天后，线虫生长21天后，从白色低毒力和有色寄生寄生衣藻C.菌落中提取了大量的A. hylurgi。从切下的美国栗叶枯萎病幼芽中提取较少数量的A. hylurgi，然后接种A. hylurgi并孵育22天。接种在切除的美国板栗溃疡病表面上的草曲霉在24小时内移至溃疡病表面上的小，带有孢子的寄生疟原虫繁殖结构（基质）。结果表明，A。hylurgi可能在美洲栗树的低毒力传播中起作用。

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