GERMINAÇÃO E VIGOR DE SEMENTES DE Genipa americana L. EM FUNÇÃO DO ESTRESSE HÍDRICO EM DIFERENTES TEMPERATURAS

Abstract

Genipa americana L. (Rubiaceae) is a fruit known popularly as genipapo, with wide distribution in all the Brazilian states, predominating in forests of humid and wet floodplains. Before the context, the objective was to evaluate the germination and vigor of G. americana seeds submitted to different osmotic powers and temperature regimes. The experiment was carried out in the Laboratory of Seed Analysis of the Agricultural Sciences Center, Federal University of Paraíba, in Areia - PB. The water stress was represented with solutions of polyethyleneglycol 6000 (PEG 6000) in its different osmotic potential and control 0.0, -0.2; -0.4; -0.6; -0.8 MPa at the permanent temperatures of 25, 30 and 35 ° C, in a completely randomized design. The germination percentage, first germination count, germination speed index, length and seedling dry mass were determined to evaluate the effect of treatments on germination and seed vigor. The results obtained showed a significant reduction in the percentage and speed of seed germination, from the potential of -0.2 MPa, compared to seeds not submitted to water stress. G. americana seeds are less inhibited at the osmotic potential to -0.2 MPa at temperatures of 25 and 30 ° C. Germination and vigor of G. americana seeds are negatively influenced by the reduction of the osmotic potential at temperatures of 25, 30 and 35 ° C.