DISCONTINUOUS HYDRATATION IN SEED GERMINATION OF Mimosa caesalpiniifolia AND Pityrocarpa moniliformis UNDER WATER STRESS

• Autor(a) principal: Nicolau, Josefa Patrícia Balduino
• Data de Publicação: 2020
• Outros Autores: Silva, Francisco Eudes da, Felix, Francival Cardoso, Torres, Salvador Barros, Pacheco, Mauro Vasconcelos, Pereira, Márcio Dias
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Caatinga
• DOI: 10.1590/1983-21252020v33n228rc
• Texto Completo: https://periodicos.ufersa.edu.br/caatinga/article/view/9108
• topic: Fabaceae; Ciclos de hidratação; Ecofisiologia da germinação; Sementes florestais; Fabaceae; Hydration cycles; Germination ecophysiology; Forest seeds

The use of discontinuous hydration cycles can improve seed germination and initial seedling growth under water stress. In this sense, the objective of this study was to evaluate the effect of discontinuous hydration on seed germination of Mimosa caesalpiniifolia and Pityrocarpa moniliformis under water stress. For this, seeds of these species were submitted to 0 (without hydration), 2 and 4 cycles of hydration and dehydration, with subsequent germination under simulated water stress for osmotic potentials 0.0 (distilled water); -0.2; -0.4; -0.6 and -0.8 MPa. Seedlings were evaluated by germination, germination speed index and seedling length tests. Discontinuous hydration in seeds of M. caesalpiniifolia and P. moniliformis was detrimental to germination and seedling vigor under water stress. The use of two cycles in P. moniliformis favored germination under more severe water stress (-0.8 MPa).