Histologia da interacao Crinipellis perniciosa em cacaueiros suscetível e resistente a vassoura-de-bruxa
This work was aimed at elucidating the interaction between Crinipellis perniciosa (Stahel) Singer and the cacao plant (Theobroma cacao L.). Histological studies were performed using light and electron microscopy (scanning and transmission). Apical buds from 'Catongo' (susceptible) and 'SCA 12' (resistant) progenies were inoculated with basidiospore suspensions, at different time intervals; samples were prepared by conventional microscopy techniques. Basidiospores germinated producing long and vigorous germ tubes, without specific orientation. Occasionally, germ tubes were seen penetrating the stomata without forming apressorium. Hyphal colonization occurred mainly in the cortex and in the pith by means of intercellular hyphae without haustorial formation. Colonization was slower and less profuse in 'SCA 12' than in 'Catongo' progenies, at a given period of time. A hyphal matrix was characteristically evident in both susceptible and resistant progenies. The hyphal matrix was thinner in the resistant than in the susceptible host, suggesting a possible mechanism of resistance. In some cases a membrane-like organelle was observed both in resistant and susceptible materials surrounding the hyphal matrix. Modifications seen in the host cell wall, when in contact with the hyphal matrix, indicated an interface probably related to nutrition. The growth of the hyphae is at first intercellular, but later becomes intracellular.
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| Format: | biblioteca |
| Published: |
Mar
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| Subjects: | THEOBROMA CACAO, CATONGO, CRINIPELLIS PERNICIOSA, ENFERMEDADES FUNGOSAS, HISTOLOGIA, HUESPEDES, RELACIONES HUESPED PATOGENO, |
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