GERMINAÇÃO E MODIFICAÇÕES ANATÔMICAS EM SEMENTES DE Sesbania virgata (CAV.) PERS. SUBMETIDAS À ESCARIFICAÇÃO QUÍMICA

This study aimed to evaluate the effects of the application of concentrated sulfuric acid on germination and possible tegumentary anatomical alterations in the overcoming of dormancy of the seeds of Sesbania virgata (Cav.) Pers. For this purpose were used eight different immersion periods (0, 15, 30, 45, 60, 120, 180 and 240 min), assessing the percentage of germination, speed index and average germination time. In addition, for each exposure time, it was evaluated the anatomic changes of the seeds. It was possible to describe four different strata (cuticle waxy layer of palisade cells, osteoesclereídes and a layer of parenchyma cells). The results suggest that the sulfuric acid application of up to 60 minutes is recommended to overcome seed dormancy of S. virgata, since it increases the germination percentage and gives rise to normal seedlings. In addition, it was verified that the exposure of S. virgata seeds to sulfuric acid in periods equal to or greater than 120 minutes, promotes the generation of new abnormal seedlings, as well as to disintegrate the layers of the integument and cause direct damage to the aleurone layer and endosperm. 2 Revista Ouricuri, Juazeiro, Bahia, v.9, n.1. p.001-012. jan./jun., 2019. http://www.revistas.uneb.br/index.php/ouricuri | ISSN 2317-0131