Efficiency of different methods for dormancy breaking in seeds of Dimorphandra mollis

• Autor(a) principal: Aguiar, Francisco Ivo dos Santos
• Data de Publicação: 2020
• Outros Autores: Silva, Rafael Carvalho da, Costa, Romário Martins, Reis, Clene dos Santos, Farias, Maryzélia Furtado de, Parra-Serrano, Luisa Julieth
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Florestal Brasileira (Online)
• DOI: 10.4336/2021.pfb.41e201901953
• Texto Completo: https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1953
• topic: Árvores do cerrado; Quebra de dormência; Produção de mudas; Cerrado trees; Dormancy breaking; Seedling production

This work aimed to determine efficient methods for dormancy breaking in Dimorphandra mollis Benth seeds. The seeds were collected from mother trees in the municipality of Buriti, Maranhão State, Brazil. They were submitted to the following treatments: control (T1); mechanical scarification with sandpaper No. 60 (T2); chemical scarification with 98% lye (sodium hydroxide) for 15 min (T3); chemical scarification with sulfuric acid 99.9% for 20 min (T4) and thermal-shock with water (T5). In a greenhouse, we used 16 seeds per treatment, divided into four replications, in a completely randomized design. The evaluations started on the third day after seeds were treated and it was carried out until 17 days after sowing. The percentage of emerged seeds and the emergence speed index were evaluate. The mechanical scarification treatment with sandpaper (T2) and the chemical scarification with sulfuric acid (T4) were efficient to overcome the seed coat impermeability , but the mechanical scarification is the safest method for users to overcome seed dormancy.