Water and saline stress on initial growth of Toona ciliata var. australis seedlings

• Autor(a) principal: Campos de Sá, Larissa
• Data de Publicação: 2023
• Outros Autores: Lazarotto, Marília, Avrella, Eduarda Demari, Hilgert, Márcio Alberto, Fior, Claudimar Sidnei
• 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/2108
• topic: Abiotic stress; Irrigation water; Forest nurseries; Estresse abiótico; Água de irrigação; Viveiros florestais

The objective of this study was to evaluate the effects of water and salt stress on initial growth of Australian red cedar (Toona ciliata var. australis) seedlings. Saline stress was evaluated in two completely randomized design (CRD) experiments, considering five osmotic potentials (0.0; -0.3; -0.6; -0.9 and -1.2 MPa). For water stress, five ranges of water potential were evaluated, using CRD (0 to -7; -7.1 to -14.0; -14.1 to -21.0; -21.1 to -28.0 and -28.1 to -35.0 kPa). At the end of both experiments the plant height, stem diameter, aerial part dry mass, roots dry mass, total dry mass and seedling survival were evaluated. Saline solutions application reduced all seedlings development variables. Up to the level of -21 kPa of water stress, there was an increase in height and the plant height and the stem diameter ratio. The other variables have been reduced since the first tested level. The tolerance of seedlings to the stresses evaluated allows for the adjustment of management conditions in the nursery before occuring losses and may also indicate a tolerance to these adverse conditions in the field.