Annatto (Bixa orellana L.) is an arboreal species domesticated in Amazonia from its wild ancestor (B. orellana var. urucurana). Bixin extracted from its orthodox seeds is a natural dye widely used in the food industry. This study evaluated methods to overcome seed dormancy and determine the germination potential, comparing domesticated and wild annatto populations. Seeds from two domesticated-type populations and two families of a wild-type population, stored for two years after field collection, were submitted to five treatments to overcome dormancy: T1 - control; T2 - mechanical scarification (with sandpaper); T3 - mechanical scarification (with sandpaper) + immersion in water at 36 ºC overnight (12 hours); T4 - immersion in water at room temperature (23 ºC, on average) for 24 h; T5 - immersion in concentrated sulfuric acid (95 - 98%) for 15 min + running water for 3 min. Highly significant differences (P < 0.001) were observed in the germination percentage of annatto seeds between wild and domesticated types, and among the treatments tested. Domesticated types showed higher germination percentage (10 - 58%) over all treatments when compared to the wild type (0 - 44%). The best treatments were those performed with mechanical scarification. Given the simplicity, we concluded that mechanical scarification with sandpaper is a good alternative to overcome dormancy of annatto seeds.
Esse primeiro volume apresenta algumas das informações técnicas que tomaram parte das inúmeras reuniões realizadas para a definição das metodologias a serem utilizadas no projeto “Sistema de Informações para Planejamento Florestal no Cerrado Brasileiro” - (SiFlor Cerrado), que tem como objetivo auxiliar produtores rurais, extensionistas, profissionais da área florestal e outros interessados, na tomada de decisões sobre a escolha de espécies arbóreas para implantação de florestas comerciais, na forma de sistemas de produção de monocultura ou de integração Lavoura-Pecuária-Floresta (iLPF) no Bioma Cerrado. O projeto é coordenado pela ESALQ/USP, UFPR e Embrapa Informática Agropecuária e conta com o apoio do Ministério da Agricultura Pecuária e Abastecimento – MAPA dentro do Plano de Agricultura de Baixa Emissão de Carbono (Plano ABC).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.