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A arvore Delonix regia (flamboyant) pertence a familia Fabaceae, subfamilia Caesalpinioideae, originario da ilha de Madagascar. Tem potencial valor economico ornamental, pois se trata de uma especie extremamente florifera e exuberante, indicada para programas de arborizacao, como parques, pracas e jardins, sendo inadequada para ruas e avenidas, devido a suas raizes serem caracterizadas como superficiais. Essa especie exotica, adaptada as condicoes ambientais de clima tropical, tem porte de 10 – 12m de altura, de tronco volumoso, espesso, com raizes tabulares. Por apresentar caracteristicas de dormencia tegumentar, este trabalho teve objetivo de avaliar alguns tratamentos para superacao de dormencia das sementes do Delonix regia. O experimento foi do tipo quantitativo, em que as sementes foram submetidas a tres tratamentos e uma testemunha, em um total de 4 tratamentos, com 75 sementes cada. A emergencia foi observada in locu, por meio de contagem manual. Os tratamentos utilizados foram: escarificacao mecânica com lixa (n° 120); imersao em agua em temperatura ambiente por 72 horas, choque termico com imersao das sementes em agua a 80 oC por 05 min e a testemunha em que nao houve nenhuma intervencao. Observou-se que a escarificacao mecânica e o choque termico proporcionaram os melhores resultados para superacao de dormencia das sementes do Delonix regia.Palavras-chave: Paisagismo. Dormencia. Emergencia.AbstractThe tree Delonix regia (flamboyant) belongs to the family Fabaceae, subfamily Caesalpinioideae, originally from the island of Madagascar. It has the potential ornamental economic value, because it is an extremely floriferous and exuberant species suitable for reforestations programs such as parks,and gardens, being inappropriate for streets and avenues, because its roots are characterized as superficial. This exotic species, adapted to the environmental conditions of tropical climate, reaches size of 10-12 m tall, large trunk, dense with tabular roots. It is renowned for being an extremely floriferous and exuberant species. By presenting cutaneous numbness characteristics, the objective of this study was to evaluate some treatments to overcome dormancy of seeds Delonix regia. The experiment was the quantitative type, in which the seeds were subjectedto three treatments and a control, a total of 4 treatments with 75 seeds each. The emergence was observed in locus through manual counting. The treatments were mechanical scarification with sandpaper (#120); immersion in ambient temperature water for 72 hours, thermal shock deep soaking the seeds in water at 80 °C for 5 minutes and the control, which had no intervention. It was observed that the mechanical scarification and thermal shock provided the best results for breaking dormancy of seeds Delonix regia.Keywords: Landscaping. Emergency Seedling. Dormancy

ensaios e ciência

Avaliação de Tratamentos de Superação de Dormência em Sementes do Delonix regia (Boger ex Hook.) Raf coletadas no Horto Florestal Tote Garcia, Cuiabá, Mato Grosso