Data/hora: 08/06/2024 15:42:45

Provedor de dados: | Brazilian Journal of Plant Physiology
País: | Brazil
Título: | Chromium stress in plants
Autores: | Panda,S.K.; Choudhury,S.
Data: | 2005-03-01
Ano: | 2005
Palavras-chave: | Antioxidants; Chromium; Fenton reactions; Metallothioneins; Oxidative stress.
Resumo: | The article presents an overview of the mechanism of chromium stress in plants. Chromium is known to be a toxic metal that can cause severe damage to plants and animals. Chromium-induced oxidative stress involves induction of lipid peroxidation in plants that causes severe damage to cell membranes. Oxidative stress induced by chromium initiates the degradation of photosynthetic pigments causing decline in growth. High chromium concentration can disturb the chloroplast ultrastructure thereby disturbing the photosynthetic process. Like copper and iron, chromium is also a redox metal and its redox behaviour exceeds that of other metals like Co, Fe, Zn, Ni, etc. The redox behaviour can thus be attributed to the direct involvement of chromium in inducing oxidative stress in plants. Chromium can affect antioxidant metabolism in plants. Antioxidant enzymes like SOD, CAT, POX and GR are found to be susceptible to chromium resulting in a decline in their catalytic activities. This decline in antioxidant efficiency is an important factor in generating oxidative stress in plants under chromium stress. However, both metallothioneins and organic acids are important in plants as components of tolerance mechanisms and are also involved in detoxification of this toxic metal.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100008
Editor: | Brazilian Journal of Plant Physiology
Relação: | 10.1590/S1677-04202005000100008
Formato: | text/html
Fonte: | Brazilian Journal of Plant Physiology  v.17 n.1 2005
Fonte: | info:eu-repo/semantics/openAccess