SciELO - Scientific Electronic Library Online

vol.31 issue1An effective device for generating alginate microcapsulesGenomic resources for the conservation and management of the harpy eagle (Harpia harpyja, Falconiformes, Accipitridae) author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Genetics and Molecular Biology

On-line version ISSN 1678-4685


CAMPOS, José Marcello Salabert de; DAVIDE, Lisete Chamma; SOARES, Geraldo Luiz Gonçalves  and  VICCINI, Lyderson Facio. Mitodepressive and clastogenic effects of aqueous extracts of the lichens Myelochroa lindmanii and Canoparmelia texana (Lecanorales, Parmeliaceae) on meristematic cells in plant bioassays. Genet. Mol. Biol. [online]. 2008, vol.31, n.1, pp. 141-145. ISSN 1678-4685.

The cytotoxicity effect of aqueous extracts of the lichens species Myelochroa lindmanii and Canoparmelia texana (Lecanorales, Parmeliaceae) were evaluated using meristematic cells of lettuce (Lactuca sativa) and maize (Zea mays). The seasonal effect was also evaluated. Extracts of M. lindmanii and C. texana inhibited root growth and/or percentage germination, possibly due to alterations in the cell cycle. The M. lindmanii extract showed anti-mitotic effects and blocked the cell cycle in metaphase so that c-mitosis and cells with chromosome duplication were produced. The C. texana extract appeared to hinder cell division, increasing the number of interphase cells. In addition, both extracts caused an increase in percentage of cell death. Clastogenic effects were also observed, such as sticky chromosomes, bridges, fragments and later segregation. Both lichen species are thus potential sources of biologically active substances with possible applications in biology, medicine and agronomy.

Keywords : Canoparmelia texana; cytotoxicity; mitotic index; Myelochroa lindmanii; plant bioassays.

        · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License