), com 3 repetições. Os resultados obtidos indicam que: a salinidade reduziu a colonização micorrízica e a nodulação radicular das mudas de sabiá; a intensificação das condições de estresse salino aumentaram a dependência micorrízica das mudas de sabiá; a colonização das mudas de sabiá com os FMAs proporcionou aumentos na matéria seca dos nódulos radiculares da ordem de 1900%; as micorrizas arbusculares reduziram o pH após o cultivo do solo; e a adição de vermicomposto não promoveu efeito sobre a colonização micorrízica das mudas de sabiá, entretanto, aumentou a produção de matéria seca dos nódulos radiculares. Palavras-chave: Sabiá (árvore). Salinidade. Microssimbiontes.ABSTRACT -The sabiá (Mimosa caesalpiniaefolia Benth.) is a plant species native to the Brazilian northeast and brings together some fundamental features for use in rehabilitation programs of salinized areas, especially if associated with arbuscular mycorrhizal fungi (AMF) and nitrogen-fixing bacteria (BFN). The aim of this study was to evaluate the mycorrhizal colonization and root nodulation of sabiá seedlings fertilized with organic compost and irrigated with water at different electrical conductivities. The experiment was carried out in a greenhouse, in a completely randomized design with a factorial scheme of 2 (presence and absence of arbuscular mycorrhizal fungi) x 2 (presence and absence of an organic compound) x 5 levels of electrical conductivity of the irrigation water (0.7, 1.2, 2.2, 3.2 and 4.2 dS m -1 ), and three repetitions. The results obtained indicate that: salinity reduced mycorrhizal colonization and root nodulation of the sabiá seedlings; intensifying salt-stress conditions increased the mycorrhizal dependence of the sabiá seedlings; the colonization of seedlings with AMF caused increases in the root-nodule dry matter of about 1900%; the arbuscular mycorrhiza reduced the pH after soil cultivation; and the addition of vermicompost had no effect on the mycorrhizal colonization of the sabiá seedlings, but did increase the production of root-nodule dry matter.

The importance of Simarouba versicolor St. Hil. fruit dispersal by the leaf-cutting ant Atta sexdens (L.) was studied in the Cerrado, Tocantins, Brazil. The trees and nests were located between a forest area and a Brachiaria decumbens Stapf pasture. Seeds were collected in October 2015 along foraging trails and on the anthill of an A. sexdens colony. Germination of three groups of seeds was tested: (1) seeds with the tegument removed by the ants; (2) seeds without tegument, cleaned manually, and (3) seeds with tegument. The germination rates for the three treatments were similar; however, it was verified that the seeds cleaned by ants germinated faster. In addition, it was verified that the ants dispersed the seeds by at least 20 meters in the study area. Simarouba versicolor is a plant studied for its insecticidal properties, and this is the first study to our knowledge reporting its dispersal by ants.