Salinity effect on germination and initial growth of seedlings of three forest tree species

• Autor(a) principal: Dutra, Tiago Reis
• Data de Publicação: 2017
• Outros Autores: Massad, Marília Dutra, Moreira, Priscila Ribeiro, Ribeiro, Érika Susan Matos
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Florestal Brasileira (Online)
• Texto Completo: https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1447
• topic: Velocidade de germinação; Massa seca total; Estresse; Germination speed; Total dry mass; Stress

The objective of this work was to evaluate the effect of saline stress on germination and initial growth of canafistula (Peltophorum dubium (Sprengel) Taubert), tamboril (Enterolobium contortisiliquum (Vell.) Morong.) and pau-formiga (Triplaris americana L.), in addition to determining the maximum tolerance to the presence of NaCl in imbibitions solution. A completely randomized design with four replicates of 50 seeds was used in factorial scheme 3 x 5. The response of the three species to five levels of osmotic potentials (0.0; -0.3; -0.6; -1.2 e -1.8 MPa) was evaluate, simulating saline stress with NaCl. At 28 days after sowing, germination percentage; germination speed index (GSI); germination time; root length and root shoot s and total dry mass were evaluated. Germination and initial growth of tamboril and canafístula were negatively affected by saline concentration increase of the medium. Pau-formiga showed more tolerance to saline stress, presenting an increase in the mean values of germination percentage, GSI, length of the largest root and total dry mass production in osmotic potentials varying from -0.81 to -1.15 MPa. The highest average production of shoot, roots and total dry mass was observed in tamboril seedlings.