Resumo

DIAS DE ALMEIDA, Gustavo et al. OXIDATIVE STRESS IN VEGETABLE CELLS MEDIATED BY ALLELOCHEMICALS. Rev. Fac. Nac. Agron. Medellín [online]. 2008, vol.61, n.1, pp.4237-4247. ISSN 0304-2847.

Allelopathy is an interaction among two organisms, where one of that is affected and the other stays stable. It can be source for discoveries of new natural phytotoxic compounds with low toxicity to the organisms that are not target of control. Most of the allelochemicals are secondary metabolites like terpenoids, phenolic compounds, organic cyanides and longchain fatty acids. The performance of the allelochemicals can be different according the situations, and it affects a great number of biochemical reactions, resulting in different physiologic modifications in the plants. Allelochemicals could affect different pathways, like, the enzymatic activity, division and structure of cells, permeability of the membranes and ions reception, culminating in reduction or inactivation of the germination and plant growth. Effects of the allelochemicals on the photosynthesis and breathing has been better characterized, however, several researches had demonstrated the performance of those compounds in oxidative stress, resulting in an increase of oxygen reactive species production which in high concentrations are harmful to cells. In that way, the knowledge of mechanisms of allelochemicals performance is necessary for the development of sustainable techniques in agriculture.

Palavras-chave : Allelopathy; oxidative stress; germination; root development.

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