Dormancy, germination and seedling production of Dimorphandra mollis Benth

Dimorphandra mollis Benth. (Caesalpiniaceae) ?? uma esp??cie arb??rea, encontrada nos biomas Cerrado e Caatinga, ??til na recupera????o de ??reas degradadas e como planta ornamental. Dos frutos (sem as sementes), extrai-se a rutina, um bioflavon??ide utilizado na ind??stria farmac??utica o qual atua na permeabilidade e na resist??ncia dos vasos capilares. As sementes cont??m altos teores de galactomananos que s??o de grande import??ncia na ind??stria de alimentos. Visando contribuir para a silvicultura a respeito dessa esp??cie, foram estudadas metodologias para supera????o da dorm??ncia das sementes, bem como os efeitos da temperatura e dos substratos sobre a germina????o em condi????es controladas, al??m da avalia????o de diferentes substratos e da fertiliza????o sobre o crescimento inicial das mudas em viveiro florestal Os melhores resultados para supera????o de dorm??ncia das sementes de D. mollis s??o obtidos quando h?? escarifica????o das sementes com lixa para ferro ou por fervura em ??gua durante 10 segundos. As temperaturas de 30 e 35??C proporcionam ??s sementes os melhores resultados de germina????o. Os substratos papel e entre vermiculita permitem bom desempenho germinativo, mostrando-se adequados para a avalia????o da qualidade fisiol??gica das sementes. O p?? de coco e a vermiculita s??o bons substratos para produ????o de mudas de D. mollis. A concentra????o de nutrientes fornecida pelos fertilizantes ?? insuficiente para melhoria do crescimento inicial das plantas.Dimorphandra mollis Benth. (Caesalpiniaceae) is a woody species coming from Cerrado and Caatinga. It is used on the recuperation of impacted areas as well as ornamental plant. From the fruits (without the seeds) it is extracted the rutin, the bioflavonoid used in the pharmaceutical industry which acts in the permeability and the resistance of the blood vases. The seeds contain high levels of the galactomanan which are very important to the food industry. In order to contribute to the silviculture about this species, methodologies were studied to overcome dormancy of the seeds, as well as the effect of the temperature and substrates on the germination under controlled conditions, beyond the different substrates evaluation and the fertilization on the initial growth of the seedlings in greenhouse The best results for overcoming dormancy of D. mollis seeds are when these ones suffered mechanical scarification with sandpaper number 50 or boiled in water at 100??C for 10 seconds. The best germination are obtained at 30 and 35??C. The substrates towel paper and vermiculite allow satisfactory germinative performance of seeds; they could be suitable for the evaluation of the physiological quality of seeds. The coconut fiber and vermiculite are good substrates for seedling production of D. mollis. The concentration of nutrients supplied by the fertilization source is insufficient to improvement of the initial growth of the seedlings