QUALIDADE FISIOLÓGICA E SANITÁRIA DE SEMENTES DE Luetzelburgia auriculata (Allemão) Ducke

Abstract

The species Luetzelburgia auriculata (Allemão) Ducke, of the Fabaceae family is distributed in the Brazilian Northeast and has the seed as the main means of propagation. The objective of this study was to evaluate the effect of different salt stress conditions at different temperatures, as well as the sanitary quality of Luetzelburgia auriculata (Allemão) Ducke seeds. The experiment was carried out in the Laboratory of Seed Analysis of the Agricultural Sciences Center of the Federal University of Paraiba in a completely randomized design, with factorial scheme 6 x 2 (salinity levels and temperatures). The saline solutions were prepared using sodium chloride (NaCl) at the concentrations of 0.0 (control); 1.5; 3.0; 4,5; 6.0; and 7.5 dS m-1, at constant temperatures of 25 and 30 °C, whose variables analyzed were: water content, germination percentage, first count and germination speed index, primary root length and aerial part, mass Dry roots and shoot. For the isolation and fungal counts, the Blotter Test method was used. The seeds of Luetzelburgia auriculata (Allemão) Ducke when submitted to saline stress induced by NaCl solutions can germinate at a concentration of up to 7.5 dsm-1; the temperature of 30 °C allows greater expression of vigor in the seeds of L. auriculata. Associated with L. auriculata seeds were detected Aspergillus sp., Aspergillus niger and Penicillium sp.