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首页> 外文期刊>European Journal of Forest Pathology >Frequencies and spatial patterns of white hypovirulent and pigmented strains of Cryphonectria parasitica within blight-controlled cankers on grafted American chestnut trees 15-16 years after inoculation
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Frequencies and spatial patterns of white hypovirulent and pigmented strains of Cryphonectria parasitica within blight-controlled cankers on grafted American chestnut trees 15-16 years after inoculation

机译：接种后15-16年的嫁接美国板栗树上的疫病控制性溃疡内白色无毒和有色隐孢子虫的频率和空间格局

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摘要

The frequencies and spatial patterns of white and pigmented strains of C. parasitica were investigated within cankers in a zone on grafted American chestnut trees inoculated with white (European) and pigmented hypovirulent strains (H-inoculated zone) 15-16 years earlier. Six 7X7 lattice plots (each 17.8X17.8 cm) were established on cankers in the H-inoculated zone of the grafts. Assays of 49 bark cores per lattice suggested that 35.3% of 306 C. parasitica isolates recovered from the 6 lattice plotswere white. The white isolates had a random pattern, potentially favourable to biocontrol, within the highly superficial cankers, based on join-count statistics of the 6 lattice plots. Pigmented isolates dominated the C. parasitica population, and virulence trials on American chestnut sprouts suggested 36% of the pigmented isolates from the H-inoculated zone were hypovirulent and 27% were virulent. Most (84.3%) pigmented isolates in a bark core could not be converted to the white phenotype in vitro bywhite isolates in the same bark core. Of 6 lattice plots, 5 had a random pattern of pigmented isolates, based on join-count statistics. The sixth lattice plot was composed of an aggregate of 36 lattice cells (area=232 cm2) containing 12 pigmented vegetative compatibility (vc) groups of C. parasitica, which were interwoven in the lattice as a mosaic of thread-like forms, blocks, or islands 32 cm2 or less in area for each vc group. Hypotheses are advanced to explain why virulent pigmented strains persistin blight-controlled cankers of the H-inoculated zone but do not kill the vascular cambium.
机译：在15到16年之前，在接种了白色（欧洲）和有色低毒力菌株（H接种区）的美国板栗嫁接树的一个区域内，对溃疡病菌的寄生虫白色和有色菌株的频率和空间格局进行了调查。在移植物H接种区的鳞茎上建立了六个7X7晶格图（每个17.8X17.8 cm）。每个晶格49个树皮核的分析表明，从6个晶格区中回收的306寄生寄生葡萄中35.3％是白色的。根据6个点阵图的连接数统计，白色分离株在高度浅表的溃疡病中具有随机模式，可能有利于生物防治。色素分离株占寄生寄生念珠菌的大部分，对美国板栗芽苗的毒性试验表明，来自H接种区的有色分离株中36％具有低毒力，而27％具有毒性。树皮核心中的大多数（84.3％）色素分离株不能被同一树皮核心中的白色分离株体外转化为白色表型。根据连接计数统计，在6个点阵图中，有5个具有着色分离物的随机模式。第六个格子图由36个格子单元（面积= 232 cm2）的集合体组成，其中包含12个有寄生植物的彩色营养相容性（vc）组，这些交织在格子中的是线状，块状，或每个vc组面积不超过32 cm2的岛。假设被提前解释了为什么有毒的色素菌株在H接种区的疫病控制的溃疡病中持续存在，却不能杀死血管形成层。

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