Resumo

HOYOS CARVAJAL, Liliana; VILLEGAS OCHOA, Marcela  e  GONZALEZ JAIMES, Elena Paola. HISTOLOGY OBSERVATIONS OF CELLULAR STRUCTURES ASSOCIATED TO Spongospora subterranea f sp. subterranea IN POTATO. Rev. Fac. Nac. Agron. Medellín [online]. 2009, vol.62, n.2, pp.5039-5045. ISSN 0304-2847.

Spongospora subterranea (Wallroth) Lagerheim f. sp. subterranea Tomlinson, is the causal agent of powdery scab in potato and is an obligate parasite, because the biological and reproductive characteristic, it has a great survival and infection capacity in both, natural and wilds host which, can belong in different ecosystems and climatic conditions. The goal in this study was to make observations of cellular associate structures to S. subterranea f. sp. subterranea in potato plants in different phenologycal stages naturally infected by the pathogen, with root galls or symptomless. For this proposal were carried out observations at light microscopy, means by were identified all phases of S. subterranea in all symptomless plants. It was demostrated that in radicular tissues of potato not always galls are indicative of infection, plants without symptoms can have protozoa structures, beside associated structures to S. subterranea as plasmodium an sporangium aggregate, are commonly found and coincident with some structures frequently reporter in wild hosts; this appreciations, allows to propose that this microorganism is common in soils, associated with wild and cultivate species, causing important disturbs specially on potato plants, where control strategies should be oriented towards the knowledge of ecology of interactions protozoa, its host and soil.

Palavras-chave : Powdery scab; Solanum tuberosum; protozoa; life cycle.

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