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首页> 外文期刊>Forest Systems >Ultrastructural and cytochemical studies of host and pathogens in some fungal wilt diseases: retro- and introspection towards a better understanding of DED
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Ultrastructural and cytochemical studies of host and pathogens in some fungal wilt diseases: retro- and introspection towards a better understanding of DED

机译：某些霉菌病的寄主和病原体的超微结构和细胞化学研究：对DED的更好理解的回顾与反思

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This report presents a survey of previous and more recent ultrastructural and cytochemical investigations of disease development in elm, caused by Ophiostoma novo-ulmi, with results of some comparative studies of other wilt diseases caused by f.spp., of Fusarium oxysporum and of Verticillium sp. For cytochemical studies, probes complexed to colloidal gold to detect cellulose, pectin, chitin, and DNA were used. Thus, the formation of tyloses, pit membrane alterations, and the disease effect on parenchyma cells in mature as well as in young tissue were characterized. Vessel lumina in these plants, in diverse situations, contained heterogeneous matter, among which occurred masses of opaque matter and in certain instances pectin fibrils secreted by parenchyma cells and tyloses. Numerous globoid, opaque bodies of regular sizes, which have been mostly overlooked previously, abounded in vessel elements of U. americana and U. glabra, including trees injected with glucose solutions prior to inoculation. Coarser fibrillar material was also noted in vessel lumina, but mostly shortly after inoculation. Other peculiar forms of O. novo-ulmi are also described. The possible role of the components under study is discussed, and a model for DED is proposed in which hindrance to vessel invasion, including downward spread of the pathogen, and reactions of parenchyma cells are complementary and considered to be conducive to defence mechanisms, including compartmentalization of the invaded xylem.
机译：本报告对以前和最近由新口蹄疫引起的榆树疾病发展的超微结构和细胞化学研究进行了调查，并对由镰刀菌，尖孢镰刀菌和黄萎病引起的其他枯萎病进行了比较研究。 sp。为了进行细胞化学研究，使用了与胶体金络合的探针来检测纤维素，果胶，几丁质和DNA。因此，表征了胎盘的形成，凹膜改变以及疾病对成熟组织和年轻组织中薄壁细胞的影响。这些植物中的血管腔在不同的情况下含有异质物质，其中出现大量的不透明物质，并且在某些情况下由薄壁组织细胞和酪氨酸分泌的果胶原纤维。许多球形，不规则大小的不透明体，以前在大多数情况下都被忽略了，它在美利坚合众国和美国香茅（U. glabra）的容器中有很多，包括在接种前注入葡萄糖溶液的树木。血管腔内也有较粗的纤维状物质，但大多在接种后不久。还描述了其它新形式的O. noul-ulmi。讨论了所研究成分的可能作用，并提出了一种DED模型，在该模型中，血管入侵的障碍（包括病原体的向下传播）和实质细胞的反应是互补的，并被认为有利于防御机制，包括区室化入侵的木质部。

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