Data/hora: 10/06/2024 04:34:15

Provedor de dados: | 39
País: | Brazil
Título: | Effects that nutritional and saline gradients have on the growth of Passiflora mucronata Lam. and Canavalia rosea (Sw.) DC. found in the restinga of Brazil
Autores: | Lourenço Junior,Jehová; Zambom,Oberdan; Rossi,Magda Santos; Cuzzuol,Geraldo Rogério Faustini.
Data: | 2013-06-01
Ano: | 2013
Palavras-chave: | Coastal ecosystems; Fabaceae; Fertility; Nutrition; Passifloraceae; Salinity; Spatial distribution.
Resumo: | Salinity and fertility are the main factors cited in Within the restinga (coastal woodland) biome in Brazil, the positioning of Canavalia rosea and Passiflora mucronata occur, respectively, near the shore-in the creeping psammophyte formation (CPF) - and far from the shore - in the Palmae formation (PF). The hypothesis that such positioning is related to salinity and fertility was tested by applying a salt gradient (increasing solutions of NaCl) and a nutritional gradient (different proportions of Hoagland solution). Neither species survived in solutions over 200 mM of NaCl. The shoots of P. mucronata showed negative growth (lower dry mass) in the first week of exposure to saline solutions. The roots of C. rosea showed great sensitivity to salinity, which resulted in greater growth reduction, with increasing plant age, in comparison with P. mucronata. C. rosea grew best in the nutrient-deficient solution, whereas P. mucronata responded best to the nutrient-rich solution, suggesting that C. rosea is better able to populate less fertile sites, such as the CPF, whereas P. mucronata is more suited to sites that are more fertile, such as the PF. Therefore, we can speculate that fertility is the only factor limiting the positioning of species in the restinga.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200008
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/S0102-33062013000200008
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.27 n.2 2013
Fonte: | info:eu-repo/semantics/openAccess