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首页> 外文期刊>Mycologia >ATHELIA ARACHNOIDEA, THE SEXUAL STATE OF RHIZOCTONIA CAROTAE, A PATHOGEN OF CARROT IN COLD STORAGE
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ATHELIA ARACHNOIDEA, THE SEXUAL STATE OF RHIZOCTONIA CAROTAE, A PATHOGEN OF CARROT IN COLD STORAGE

机译：蛛网状无雅典娜（Athelia arachnoidea），胡萝卜的致密性，冷储存的胡萝卜素的一种性状

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Athelia arachnoidea was collected during winter on dead leaves of deciduous trees in Oregon. Minute sclerotia (0.2-1.0 mm) were seen on hymenia, whereas in culture sclerotia were much larger (1.0-5.0 mm). The pathogenicity, morphological characteristics, and temperature growth responses of the anamorphic state, were identical to Rhizoctonia carotae. The relationship between the sclerotial anamorph and the teleomorph was confirmed by DNA sequence of the internal transcribed spacers of the nuclear ribosomal repeat unit. The sequences were homologous among the specimens of A. arachnoidea and the sclerotial anamorph from Oregon, A. arachnoidea and R. carotae isolates from culture collections, and several isolates of R. carotae from carrot cold-storage facilities. Like R. carotae, A. arachnoidea produced abundant crystals of calcium oxalate on the hyphae, was pathogenic on carrot at 3 C, and caused crater rot symptoms equivalent in severity. Sclerotia of A. arachnoidea-R. carotae did not germinate under conditions suitable for eruptive germination in A. rolfsii. The DNA sequence of A. epiphylla from Europe was identical (within 6 bp) to A. arachnoidea-R. carotae, whereas A. epiphylla from North America varied by 34-46 independent base pair changes. Athelia epiphylla and A. arachnoidea formed similar sclerotia. Connecting the Rhizoctonia root pathogen to the Athelia teleomorph links the disparate literatures on the natural history of this fungus and reveals significant insights into the epidemiology of the disease. Fibularhizoctonia gen. nov. is proposed to encompass Rhizoctonia species with clamp connections, and the description of R. carotae and R. centrifuga are emended. [References: 52]
机译：冬季在俄勒冈州落叶乔木的枯叶上收集了无鳞小蜜蜂。在处女膜上可见微小的菌核（0.2-1.0 mm），而在培养中菌核则更大（1.0-5.0 mm）。变形状态的致病性，形态学特征和温度生长响应与胡萝卜根瘤菌相同。核型核糖体重复单元的内部转录间隔区的DNA序列证实了硬化无形体和远形体之间的关系。这些序列在A. arachnoidea的标本和俄勒冈州的硬菌变体，A。arachnoidea和R. carotae的标本中是同源的，这些标本来自培养物收藏，而胡萝卜的R. carotae的标本则来自胡萝卜冷藏设施。像胡萝卜一样，蛛形纲细菌在菌丝上产生大量草酸钙晶体，在3 C时对胡萝卜具有致病性，并导致严重的火山口腐烂症状。 A. arachnoidea-R的菌核。在适合于A. rolfsii萌发的条件下，胡萝卜素不发芽。来自欧洲的表叶农杆菌的DNA序列与蛛网菌-R相同（6bp以内）。胡萝卜，而来自北美的表叶农杆菌的变异为34-46个独立的碱基对变化。硬皮表皮小花和A. arachnoidea形成类似的菌核。将根瘤菌根病原体连接到Athelia teleomorph上，就此真菌的自然史链接了许多文献，并揭示了对该病的流行病学的重要见解。 Fibularhizoctonia gen。十一月拟议中包括钳夹连接的Rhizoctonia物种，并对R. carotae和R. centrifuga的描述进行了修改。 [参考：52]

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