Histopathology and pathogenesis of Pseudocercospora opuntiae on prickly pear
DOI:
https://doi.org/10.33885/sf.2013.3.1118Keywords:
histological sections, plasmolysis, cell disintegration, black spot, conidiaAbstract
Pathogenesis process of Pseudocercospora opuntiae, the causal agent of black spot in
prickly pear was described. In histological sections of diseased cladodes was observed mycelium
in substomatal cavities and hyphae developing intercellulary in the epidermis, collenchyma and
chlorenchyma. At 111 dai, greater amount of mycelia was observed, the hyphae invasion
continued intercellulary to the storage parenchyma, vascular bundles and medular parenchyma.
After that, at 122 dai plasmolysis in the collenchyma and chlorenchyma and, in the case of
chlorenchyma, the disintegration of the chloroplasts were noted; in the substomatal cavity the
mycelium was grouped to give rise to the stromatic tissue. Finally, at 129 dai, the mycelium
caused plasmolysis of the membrane and cell disintegration in the epidermis, collenchyma and
chlorenchyma, the stomatal apparatus (stomatal pore, guard cells and subsidiaries cells) was
destroyed and begun the formation of stroma in substomatal cavity, phloem suffered
disorganization and disintegration, as well as floematic fibers and the xylem vessels
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