Quebra de dormência e germinação de sementes de gramíneas nativas que ocorrem em áreas industriais

Abstract

The use of native grasses in industrial areas for the restoration of contaminated soils has been suggested as a viable alternative. However, the dormancy of their seeds constitutes a barrier to their use. The expression of dormancy in tropical grasses is associated with physiological causes present in freshly harvested seeds or physical causes related to restrictions imposed by the seed coat, such as the absorption of oxygen and water by the seeds. The present study aimed to evaluate the efficiency of different methods for breaking dormancy of native grass seeds that occur in industrial areas of Maputo Province, namely Chloris virgata, Eragrostis sp., Panicum maximum and Urochloa mosambicensis. The study was conducted in a randomized design (DC), with a total of 6 treatments: sulfuric acid for 5, 10 and 15 minutes and distilled water at 600C for 5, 10 and 15 minutes distributed in 3 replicates that resulted in 18 experimental units. The best treatment for overcoming dormancy was immersion of seeds in sulfuric acid for 10 minutes in both substrates (paper and sand, respectively) for Chloris virgata (16.7 and 13.3) %, Eragrostis sp. (36.7 and 30.0) %, Panicum maximum (40.0 and 26.7) % and for 5 minutes for Urochloa mosambicensis (33.3 and 26.7) %(TRADUÇÃO NOSSA)