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Histopathological aspects of mango resistance to the infection process of Ceratocystis fimbriata

机译：芒果对纤毛孢子虫感染过程的抗性的组织病理学方面

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摘要

Mango wilt, caused by Ceratocystis fimbriata, is one of the most important diseases affecting mango yields in Brazil. Information regarding the infection process of C.fimbriata in the stem tissues of mango from different cultivars and the basis of host resistance to the pathogen is rare in the literature. Thus, the objective of the study was to investigate how infection by two isolates of C.fimbriata can be affected by mango cultivar-specific mechanisms of resistance. Disease progress on the inoculated stem tissues of the mango cultivars was evaluated and stem sections were obtained from the site of inoculation and prepared for histopathological observations using light microscopy. The factors mango cultivars and C. fimbriata isolates and their interaction were significant for all measures of disease development. Plants from the cultivars Espada, Haden and Palmer inoculated with isolates of C.fimbriata were more susceptible, whereas plants from the cultivars Tommy and Uba were moderately resistant and resistant, respectively. Histopathologically, fungal isolates apparently massively colonized the stem tissues of plants from the susceptible cultivars Espada, Haden and Palmer, starting from the collenchyma and moving in the direction of the cortical parenchyma, xylem vessels and pith parenchyma. By contrast, on stem tissues of plants from the resistant cultivars Tommy Atkins and Uba, most of the cells reacted to C.fimbriata infection by accumulating amorphous material. The results from the present study strongly indicated the importance of phenolic compounds for mango cultivar resistance against infection by Brazilian C.fimbriata isolates.
机译：毛囊藻致病的芒果枯萎病是影响巴西芒果产量的最重要疾病之一。在不同品种的芒果干组织中，关于纤毛衣原体感染过程的信息以及宿主对病原体抗性的基础资料很少。因此，该研究的目的是研究芒果菌种特异的抗性机制如何影响两种分离的纤毛衣原体的感染。评估芒果品种接种后的干组织上的疾病进展，并从接种部位获得茎切片，并准备用光学显微镜进行组织病理学观察。芒果栽培种和纤毛衣原体分离物的因素及其相互作用对疾病发展的所有措施均具有重要意义。接种了纤毛衣原体分离株的Espada，Haden和Palmer品种的植株更易感，而Tommy和Uba品种的植株分别具有中等抗性和抗性。在组织病理学上，真菌分离株明显地从易感品种Espada，Haden和Palmer大量地定植在植物的茎组织中，从菌落开始，并朝着皮质实质，木质部血管和髓髓实质的方向移动。相反，在来自抗性品种汤米·阿特金斯（Tommy Atkins）和乌巴（Uba）的植物的茎组织上，大多数细胞通过积累无定形物质对纤毛衣原体感染做出反应。本研究的结果有力地表明了酚类化合物对于芒果品种抵抗巴西纤毛衣原体分离株感染的重要性。

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