Effects of long-term salt stress on antioxidant defence systems, leaf water relations and chloroplast ultrastructure of potato plants

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Fidalgo, F (Autor) FCUP; Santos, A (Autor) FCUP; Santos, I (Autor) Outra; Salema, R (Autor) Outra

Revista

Título: Annals of Applied Biology

Vol. 145

Páginas: 185-192

ISSN: 0003-4746

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 85 Citações

Scopus - 102 Citações

Classificação Científica

FOS: Ciências agrárias > Outras ciências agrárias

Outras Informações

ID Authenticus: P-000-C92

DOI: 10.1111/j.1744-7348.2004.tb00374.x

Abstract (EN): The effect of long-term (30 days) NaCl treatments (100 mm and 200 mm) on the activity of some antioxidant enzymes, level of antioxidant metabolites, water relations and chloroplast ultrastructure, was studied in potato (Solanum tuberosum cv. Desiree) leaves. Salt stress negatively affected relative water content, leaf stomatal conductance and transpiration rate. In treated plants, proline was enhanced, but there was a significant decrease in ascorbate and proteins. Total superoxide dismutase activity was increased. The isozyme patterns detected in native gels from salt-irrigated plants were not changed although all the isoforms appeared more heavily stained due to higher activity. In contrast, at both levels of NaCl, catalase activity decreased and ascorbate peroxidase activity showed no significant change in comparison with an untreated control. At ultrastructural level, only thylakoid swelling and a decrease in the amount of grana stacking was observed in treated plants. The overall behaviour of the antioxidant enzymes suggests an increase of cellular H2O2 that would contribute to the oxidative stress of potato plants, but which may be alleviated somewhat by the enhanced levels of proline.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8