Phytotoxic effects of a natural bloom extract containing microcystins on Lycopersicon esculentum

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Fatima El Khalloufi (Autor) Outra; Issam El Ghazali (Autor) Outra; Sana Saqrane (Autor) Outra; Khalid Oufdou (Autor) Outra; Vitor Vasconcelos (Autor) FCUP; Brahim Oudra (Autor) Outra

Revista

Título: Ecotoxicology and Environmental Safety

Vol. 79

Páginas: 199-205

ISSN: 0147-6513

Editora: Elsevier

Indexação

ISI Web of Knowledge - 38 Citações

Scopus - 44 Citações

Classificação Científica

FOS: Ciências médicas e da saúde > Medicina básica

Outras Informações

ID Authenticus: P-002-AW8

DOI: 10.1016/j.ecoenv.2012.01.002

Abstract (EN): The cyanobacterial toxins microcystins (MC) are known to affect many processes in plants. Their presence in the water used for irrigation may have considerable impact on the survivorship, growth and development of plants. In this study, a crude extract of a toxic cyanobacterial bloom from "Lalla Takerkoust" reservoir (Morocco) was used to study the effects of extract containing MC on tomato plants (Lycopersicon esculentum). Five MC variants: MC-LR, MC-FR, MC-LY, MC-(H4)-YR and DMC-LR were identified by HPLC in the cyanobacterial extract. Exposure of the seeds to the crude extract (containing 22.24 mu g MC mL(-1)) caused a reduction of germination up to 85%. Experiments showed that 30 days exposure of plant to the cyanobacterial extract containing MC caused inhibition of L. esculentum growth and productivity, as well as harmful effects on photosystem II activity, measured by Fv/Fm fluorescence. An accumulation of nutrients Na+, K+ and Ca2+ was also registered. The activity of peroxidase and phenolic content indicated that the extract caused an oxidative stress. The tissue necrosis of leaves was also a consequence of MC exposure indicating a disorder in the exposed plant metabolism.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7