Resumo: O experimento foi conduzido na horta da Universidade Federal Rural do Semi-Árido (UFERSA), no período de setembro a dezembro de 2009, com o objetivo de realizar o levantamento fitossociológico nos seguintes tratamentos: sistema de monocultivo da cenoura (Daucus carota) e sistema de cultivo da cenoura consorciada com rabanete (Raphanus sativus). Para cada sistema de plantio foram realizadas 24 amostragens em quadrados vazados de 0,50 m de lado, onde as plantas daninhas foram coletadas e separadas por espécie, para determinação das seguintes características: número total de indivíduos por espécie, número total de parcelas que contém a espécie, freqüência, freqüência relativa, densidade, densidade relativa, abundância, abundância relativa, massa seca, massa seca relativa, índice de valor de importância (IVI), e o índice de valor de importância incluindo a massa seca (IVI-MS). Foram identificadas 19 espécies, distribuídas em 12 famílias botânicas. A família mais representativa foi a Poaceae, seguida por Portulacaceae, Cyperaceae, Tumeraceae, Euphorbiaceae, Malvaceae, Amaranthaceae, Rubiaceae, Fabaceae, Molluginaceae, Convolvulaceae e Asteraceae. As áreas conduzidas no sistema de consórcio apresentaram redução de 13,2% na massa seca pelas plantas daninhas, embora a densidade não tenha sido alterada. A espécie de planta daninha Portulaca oleracea se destacou em relação às demais por ter acumulado 40,21 e 47,31% da massa seca produzidas infestantes em monocultivo e consórcio, respectivamente. Palavras-chave: Daucus carota. Raphanus sativus. Consórcio.Abstract: Was conducted the experiment in didact garden at the Rural Federal University of Semi-Arid, from September to December 2009, in order to carry out the phytosociological survey in the treatments: monocrop system of carrot (Daucus carota) and intercropping system of carrot with radish (Raphanus sativus). For each planting system were conducted 24 sampling on leaked squares of 0.50 m side, where the weeds were collected and separated by species, to determine the characteristics: total number of individuals per species, total number of parcels containing the species, frequency, relative frequency, density, relative density, abundance, relative abundance, dry matter, relative dry matter, importance value index (IVI), and importance value index including the dry matter (IVI-DM). 19 species were identified, distributed in 12 botany families. The Poaceae was the most representative family, followed in descending order of presence by Portulacaceae, Cyperaceae, Tumeraceae, Euphorbiaceae, Malvaceae, Amaranthaceae, Rubiaceae, Fabaceae, molluginaceae, Convolvulaceae and Asteraceae. In the areas conducted in intercropping system there was a decrease by 13.2% in dry matter of weeds, although its density remained constant. The specie, Portulaca oleracea, stands out over the others for having accumulated 40.21 and 47.31% of dry matter in monocrop and intercrop systems, respectively.

This study aimed to evaluate the morphological and anatomical changes of Salvinia auriculata exposed to different concentrations 0, 2.5, 5, 7.5 and 10 µM of cadmium (Cd) and its effect on plant growth. The experiment was conducted in the laboratory of Plant Anatomy of the IF Goiano/Rio Verde Campus, Goiás. Cd free samples of S. auriculata, was obtained from the Aquários Plantados company, located in Belo Horizonte. The material was grown hydroponically for 20 days and after the experimental period, the leaf samples were fixed, including in historesin, cut to 5 μm thick thick, stained with toluidine blue and the images were obtained in an optical microscope. The toxic effects of Cd on S. auriculata was observed at lowest concentration with the appearance of chlorotic and necrotic spots. Microscopic analysis showed increased height and width of the aerenchyma gaps, mesophyll and a reduction in abaxial surface epidermal cells, due to increased doses of this metal. It was observed that S. auriculata is a plant sensitive to Cd, and thus indicated for environmental monitoring.