Comparison of the anatomy and chemistry of Lantana camara and L. radula and interaction of those species with Corynespora cassiicola / Comparação da anatomia e química de Lantana camara e L. radula e interação dessas espécies com Corynespora cassiicola

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Considering the similarity between L. camara and L. radula, and consequently the difficult in distinguishing then when only sterile samples are available, in this work was investigated the use of anatomical characterists of the leaves of both species as a tool for suporting the correct classification. The differences were observed in the petiole and in the leaf blades that presented secretor idioblasts in L. camara. In the species L. radula were found crystalliferous idioblasts in the leaf blades. The capitate trichomes as well as the abaxial surface are different in each species. The histochemical study showed differences in the secretions composition of the three types of capitate trichomes for the two species and in idioblasts of L. camara. The essential oils were detected in all types of capitate trichomes and idioblasts. The main components identified in essential oil of L. camara are germacrene-D and E- caryophyllene and of L. radula are E-caryophyllene and phytol. The biological assays demonstrated that the oil of L. radula is more effective than the one from L. camara to inhibit the growth of the fungus Corynespora casiicola . The comparative study of the relation between C. cassiicola/Lantana spp. seem to be directly connected to the host. Injuries were observed 24 hours after inoculation and these were larger in L. camara. The topography of the abaxial surface of L. radula seems to make recognition by the pathogen difficult. The formation of appressorium in the two species was observed and occasionally hyphas penetrated the stoma without obvious morphological alterations. The penetration in L. camara and L. radula takes place mainly on the abaxial surface and the intercellular or intracellular colonization. The thickness of the epidermic cell walls that demonstrates a reaction to the presence of the fungus was verified. The spongy tissue was the most affected and there was breakage and disorganization of the cells as verified in the veins. The fungus acts like a necrotrophic agent.

ASSUNTO(S)

botanica aplicada histopatologia idioblasts Óleo essencial idioblastos glandular trichomes histopathology histochemistry histoquímica tricomas glandulares essential oils

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