Extracts of Achyroclinesatureioides(Lam.) DC.on germination "in vitro"Eragrostis planaNees

Abstract

The exotic grass Eragrotis planaNees, known as tough anonni-grass, is one of the main invasive plants of southern Brazil, with the ability to excludeother natives rangeland plants. There is an environmental as well as economic necessity of its control. The objective was to evaluate the effect of the species Achyrocline satureioides(Lam.) DC. on the in vitrogermation of Eragrostis planaNees, as well to identify the compounds present in these aqueous extracts. For the preparation of the extracts was performed by infusionof the flowers of the A. satureioidesin four concentrations of 5, 10, 15, 25 g L-1, which were evaluated along with a control (distilled water). All extracts concentrations were analyzed by High Performance Liquid Chromatography (HPLC-DAD). Next,the seed germination and vigor test of the E. planawas carried out. As for the germination percentage of the seeds annoni-grass, the values obtained showed a reduction in the percentagein the highest concentration of the marcela extract.Regarding Germination Rate Index, all concentrations of marcela extracts reduced the germination speed. For the analysis of the compounds present in the extracts studied, the HPLC-DAD revealed higher levels of rutin, caffeic acid and quercitrin. The extracts of A. satureioidesreduction the germination percentage.