Abstract
Despite the importance of the Amazonian species Schizolobium amazonicum, there is still no official protocol to favor the germination process of its seeds. The objective of this study was to evaluate methods of overcoming dormancy of paricá seeds and the quality of seedlings produced. The work was carried out at the Federal Institute of Education, Science and Technology of Tocantins-Campus Araguatins. The experimental design was a completely randomized design with seven treatments and four replications. The treatments consisted of: intact seeds; lateral mechanical scarification of the tegument with electric emery for 2 seconds; lateral mechanical scarification of the tegument, using sandpaper number 50 for 1 minute + immersion in water at room temperature for 12 hours; chemical scarification of the tegument with caustic soda at 20% concentration for 30 minutes; chemical scarification of the tegument with caustic soda at a concentration of 20% for 45 minutes; immersion in water at 80 ºC + stay in water (room temperature) for 12 hours; immersion in water at 90 ºC + stay in water (room temperature) for 12 hours. The treatment with lateral mechanical scarification of the integument using electric emery for 2 seconds is the most suitable for overcoming dormancy in paricá seeds. Methods of overcoming dormancy had no influence on the quality of paricá seedlings.
Highlights
The results of the analysis of variance indicated a significant effect among treatments by the F test for the variables emergence of seedlings at 7 days (ES7), emergence of seedlings at 21 days (ES21), emergency speed index (ESI) and percentage of normal seedlings (PNS)
Means followed by the same letter do not differ significantly by the SNK test (p < 0.01); Intact seeds (T1); Lateral mechanical scarification of the integument with electric emery for two seconds (T2); Lateral mechanical scarification of the integument, using sandpaper n° 50 for one minute + immersion in water at room temperature for twelve hours (T3); Chemical scarification of the integument with caustic soda at a concentration of 20% for thirty minutes (T4); Chemical scarification of the integument with caustic soda at a concentration of 20% for forty-five minutes (T5); Immersion in water at 80 °C + permanence in water for twelve hours (T6); Immersion in water at 90 °C + stay in water for 12 hours (T7)
Chemical treatment of paricá seeds with caustic soda did not promote greater emergence and provoked insults to seedlings that emerged
Summary
Planted forests represent 7% of the world’s forests, and in Brazil this activity will gain more importance due to commitments to reduce greenhouse gases and conservation of native forests, encouraging commercial plantations (IBÁ, 2015; Soares et al, 2017).In the Amazon region, there are several native species with potential for use in reforestation and for the purpose of commercial plantations (DIAS et al, 2015), among them the specie Schizolobium amazonicum Huber ex Ducke (Paricá) has been gaining notoriety at the national level as a promising specie, with great acceptance in the national and foreign markets due to its silvicultural potential (Vidaurre et al, 2012; Dias et al, 2015).In Brazil, there are around 90,047 hectares with paricá plantations, considering the states of Pará, Maranhão and Tocantins (IBÁ, 2016). Planted forests represent 7% of the world’s forests, and in Brazil this activity will gain more importance due to commitments to reduce greenhouse gases and conservation of native forests, encouraging commercial plantations (IBÁ, 2015; Soares et al, 2017). In the Amazon region, there are several native species with potential for use in reforestation and for the purpose of commercial plantations (DIAS et al, 2015), among them the specie Schizolobium amazonicum Huber ex Ducke (Paricá) has been gaining notoriety at the national level as a promising specie, with great acceptance in the national and foreign markets due to its silvicultural potential (Vidaurre et al, 2012; Dias et al, 2015). Despite the great silvicultural value, paricá seeds present a type of dormancy very common in legumes, which is the impermeability of the tegument to the entrance of water, which hinders the production of seedlings of this species (Cruz & Pereira, 2014). Despite the great silvicultural value, paricá seeds present a type of dormancy very common in legumes, which is the impermeability of the tegument to the entrance of water, which hinders the production of seedlings of this species (Cruz & Pereira, 2014). Silva Neto et al (2007), reinforce that seeds of tropical legumes present impermeability of the integument, being able to reach up to 98% of the seeds
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
