Affiliation:
1. Universidade Federal de Lavras, Brazil
2. Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais, Brazil
3. Universidade Federal de Alfenas, Brazil
Abstract
Abstract Some macrophytes species show a high growth potential, colonizing large areas on aquatic environments. Cattail (Typha angustifolia L.) uncontrolled growth causes several problems to human activities and local biodiversity, but this also may lead to competition and further problems for this species itself. Thus, the objective of this study was to investigate anatomical modifications on T. angustifolia plants from different population densities, once it can help to understand its biology. Roots and leaves were collected from natural populations growing under high and low densities. These plant materials were fixed and submitted to usual plant microtechnique procedures. Slides were observed and photographed under light microscopy and images were analyzed in the UTHSCSA-Imagetool software. The experimental design was completely randomized with two treatments and ten replicates, data were submitted to one-way ANOVA and Scott-Knott test at p<0.05. Leaves from low density populations showed higher stomatal density and index. These modifications on stomatal characteristics were more evident on the leaf abaxial surface. Plants from low density populations showed thicker mesophyll and higher proportion of aerenchymal area. Roots from low density populations showed a higher proportion of the vascular cylinder. Whereas, plants from higher density populations showed greater thickness of the endodermis, exodermis, phloem and root cortex. Higher density populations showed a higher proportion of aerenchymal gaps in the root cortex. Therefore, cattail plants from populations growing under high density population show anatomical traits typical of plants under stress, which promotes the development of less functional anatomical modifications to aquatic environments.
Subject
General Agricultural and Biological Sciences
Reference31 articles.
1. Oxygen distribution in wetland plant roots and permeability barriers to gas-exchange with the rhizosphere: a microelectrode and modelling study with Phragmites australis.;Armstrong W.;Annals of Botany,2000
2. Anatomia foliar e potencial hídrico na tolerância de cultivares de café ao estresse hídrico;Batista L.A.;Revista Ciência Agronômica,2010
3. Variabilidade morfológica foliar de Miconia sellowiana (DC.) Naudin (Melastomataceae) em diferentes fitofisionomias no Estado do Paraná;Boeger M.R.T.;Revista Brasileira de Botânica,2008
4. Produtividade de grãos e qualidade de sementes de café em resposta à densidade populacional;Braccini A.L.;Ceres,2008
5. Incidência de podridões do colmo, grãos ardidos e rendimento de grãos de híbridos de milho submetidos ao aumento na densidade de plantas;Casa R.T.;Summa Phytopathologica,2007
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