Morfoanatomia de Ricinus communis L. (Euphorbiaceae) expostas a estresse salino

Abstract

The castor bean is an Euphorbiacea widely distributed throughout the Brazilian territory, where easly adapted. Its ability to adapt to different conditions and their resistance to water deficit, allow its development into infertile soil and in adverse conditions for most plants. Its culture is considered quite rustic, however, is sensitive to the physical and chemical characteristics of the soil as particle size, pH and salts presence. In this context, the aim of this work was characterize the morphological and anatomic alterations presented by Ricinus communis L., to var. Mirante 10 plants, exposed to salt stress. Thus, the seeds were germinate at two substrates, sand and earth, containing different salt concentrations. The evaluated parameters, were plant length, dry/wet matter percentage and leaf area stomatal density, were evaluated. The anatomical data were obtained through free hand cuts of stem, leaf and root, clarified, observed and photographed on optical microscope with camera attached. The results showed that Ricinus communis L. plants, differentiated respond to salt levels and substrate, with the strongest responses in anatomical changes, especially in root. The two substrates tested directly influenced the emergence and establishment of these plants to the condition of salinity in the soil.