Response of tomato plants (Lycopersicon esculentum cv Micro-Tom) to cadmium / Resposta de plantas de tomate (Lycopersicon esculentum cv Micro-Tom) ao cádmio

AUTOR(ES)

Priscila Lupino Gratão

DATA DE PUBLICAÇÃO

2008

RESUMO

It is known that among the main environmental contaminants are included the heavy metals, a result of the intense industrialized activity. Cadmium (Cd) is a non essential element that is among the most dangerous heavy metals, leading to considerable losses in plant productivity and hazardous health effects, even in low concentrations. Considering the high Cd toxicity, the characterization of the responses by a model system like Micro-Tom may be essential to understanding about physiological, biochemistry and genetic processes involved with the toxicity and resistance to Cd. Another major aspect to be considered is the economical importance of tomato in world agriculture and the possible losses of productivity caused by Cd. The main objective of this part of the work was to study Cd-induced oxidative stress in Micro- Tom plants. Through the parameters analysed, it was possible to characterize the Micro-Tom model related to Cd toxicity. After this initial characterization based mainly on antioxidative activities, it was possible to include in the study hormonal mutants (auxin, ethylene, introduced into the Micro-Tom line), in order to investigate whether these mutants respond differently from the wild-type when Cd-induced oxidative stress is concerned.

ASSUNTO(S)

antioxidantes cádmio antioxidant enzymes tomato hormônios vegetais estresse oxidativo hormonal mutants metal pesado do solo oxidative stress mutação genética.

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