Qualidade de sementes de espécies arbóreas da caatinga com potencial uso na recuperação de áreas degradadas.

Abstract

Agriculture devastates Brazilian forests and may cause irreversible damage. We studied seeds of four tree species used on forest recovering in northeastern Brazil: aroeira (A4yracrodruon urundeuv'a Allemão), catingueira (Po/nc/ane//a param/da//s Tul), jurema preta (M/mofa rena/É7ora (Willd) Port.), and pau-ferro (L/ó/d/b/a Ée/rea Mart ex Tul.). We described morphology, germination, seedlings, physiological quality, and pathology. In average, seeds of aroeira had 3.6 mm of length, 3.3 mm of width, and 2.6 mm of thicknessl catingueira had l0.6, 8.5, 2.2 mml jurema preta had 3.2, 2.6, 1.4 mml and pau-ferro had 9.0, 6.5, 4.2 mm. respectively. Seeds of aroeira and catingueira endured 6 dS.m-l of salinity without physiological loss. However, physiological quality of jurema preta and pau-ferro decreased with increasing salinity. The incubation in roll of paper under 30'C enhanced germination of aroeira, pauferro, and catingueira. In sanitary quality tests, ,4spergl//us was the most common fur\gus, 'Eo\\owed by Penicillium, Trichoderma, Cladosporium, and Fusarium. Disinfestation with 2% hypochlorite decreased incidence of fungus.