Dormência, germinação e produção de mudas de Dimorphandra mollis Benth

Abstract

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 100ºC for 10 seconds. The best germination are obtained at 30 and 35ºC. 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.