Morphologic characterization of fruits, seeds and seedlings of Jacaranda Bahia (<i>Dalbergia nigra</i> (Vell.) Fr. All. Ex. Benth) LeguminosaePapilonoideae

Abstract

The present work aimed to describe and illustrate the external morphologic characteristics of fruits, seeds, initial phases of the germination and  seedlings of Dalbergia nigra on the first 28 days after sowing. The experiment was carried out in laboratory conditions. One hundred fruits were randomly selected for description of the external characteristics: weight, type, coloration, dehiscence, which observations were made by a binocular microscope. In relation to the external characteristics of seeds, weight, color, form and texture of surface were also observed. For tests, four replications of 25 seeds were used. The fruit is samara type, with dark, brilliant brown coloration, rugose surface, indehiscent, dry, presenting an oblong format, fully bordered, being slightly curved, with acuminate apex. It shows from 1 to 2 seeds per fruit. The seed has oblong form, ranging from oval, plane, compressed  sidelong, well delimited hilum, small micropyle with raphe, situated at the ventral part. Radicle emergence was observed three days after sowing, in cream color, pivotant, cylindrical and pubescent. Cylindrical hypocotyl,, herbaceous. The germination is epigeous, phanerocotylar, the cotyledons are opposed, subsessiles, pulpous, oblong, with rounded bases, whole margins, rounded apexes with unconspicuous nerves. Compounded eophylls, with light green coloration.