Morfoanatomia, fisiologia e tecnologia de propágulos de Dalbergia spruceana Benth (Leguminosae-Caesalpinioideae).

Abstract

Dalbergia spruceana Benth, also known as Rosewood of Pará, belongs to a Fabaceae family and is spread between the states of Pará, Amazonas, Amapá and Rondônia. It can be found in short dry forests and some open fields. Dalbergia spruceana Benth, commonly known as Jacarandá do Pará, belongs to the Fabaceae family, distributed throughout the states of Pará, Amazonas, Amapá and Rondônia. It inhabits the drought woods not too tall and some open fields. The aim of this study was to evaluate the physiological and technological quality, describing the anatomy of seeds and propagating morphology of Jacarandá do Pará. The study was conducted at the Forest Seeds Laboratory (Eastern Amazonia EMBRAPA) and Plant Anatomy Laboratory (Emílio Goeldi Museum of Pará). The terminology and methodology were established for each area. The electrical of conductivity test shows to be promising to 70 ml with water in one hour period, at about 25º C. The acid gibberellic treatment do not represent an alternative in the seedling formation process. The viability and force of seeds were affected by the increase in accelerated ageing chamber time. The fruits and seeds presented variability of the biometric features, and found no similarity about length, width and thickness, as compared with the other species of the same genus. The germination test was conducted at the temperatures of 25º and 30º C into the vermiculite substrate. Morphologically the fruit is samara-type, dry, indehiscent, glabrous, coriaceous, non-segmented, plane, and the seeds are kidney shape, flattened, glabrous, with a thin brown membranous, slightly rough surface, with yellow staining, after being removed tegument. The germination is epigeous fanerocotiledonar type, with tegument adhered to the cotyledons in the growth period of the plant. Anatomically the seeds are composing of tegument in three layers. The exotest presents anticlinal walls and extern periclinal with reticulated thickening, uniseriate, thin and delicate intern periclinal, with cellulose presence.