Estresse hídrico e salino no crescimento inicial de mudas de Toona ciliata var. australis

Larissa Campos de Sá; Marília Lazarotto; Eduarda Demari  Avrella; Márcio Alberto Hilgert; Claudimar Sidnei Fior

doi:10.4336/2023.pfb.43e202002108

Authors

Larissa Campos de Sá Tanagro S.A. https://orcid.org/0000-0001-6882-3298
Marília Lazarotto Universidade Federal de Pelotas https://orcid.org/0000-0003-0621-6120
Eduarda Demari Avrella Universidade Federal do Rio Grande do Sul https://orcid.org/0000-0002-8819-983X
Márcio Alberto Hilgert Universidade Federal do Rio Grande do Sul https://orcid.org/0000-0002-2983-7758
Claudimar Sidnei Fior Universidade Federal do Rio Grande do Sul https://orcid.org/0000-0001-9893-081X

DOI:

https://doi.org/10.4336/2023.pfb.43e202002108

Keywords:

Abiotic stress, Irrigation water, Forest nurseries

Abstract

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.

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Author Biographies

Larissa Campos de Sá, Tanagro S.A.

http://lattes.cnpq.br/9682816083901858

Marília Lazarotto, Universidade Federal de Pelotas

http://lattes.cnpq.br/1310246210091310

Eduarda Demari Avrella, Universidade Federal do Rio Grande do Sul

http://lattes.cnpq.br/9006994441341372

Márcio Alberto Hilgert, Universidade Federal do Rio Grande do Sul

http://lattes.cnpq.br/3352606946177113

Claudimar Sidnei Fior, Universidade Federal do Rio Grande do Sul

http://lattes.cnpq.br/7123252970342522

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