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Aluminium speciation and internal detoxification mechanisms in plants: where do we stand?
Tomás Grevenstuk1, Anabela Romano
1IBB-CGB, Faculty of Sciences and Technology, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal. tgrevens@ualg.pt aromano@ualg.pt.
Abstract:
Aluminium (Al) typically has a deleterious impact on plant growth and development but some plants can accumulate otherwise toxic concentrations of this metal by deploying internal detoxification mechanisms (tolerance mechanisms). Although there are scattered reports concerning the regulation of Al uptake, transport and storage in metabolically innocuous forms, the overall picture remains incomplete and there are no accounts of a general overview of Al tolerance mechanisms. This review aims to compile the current knowledge on the physiological basis of Al tolerance and speculate on possible underlying molecular mechanisms regarding the uptake of Al, speciation in internal organs, transport to upper organs and storage in non-vital structures. Given the difficulties in detecting and studying the speciation of Al, special attention will be given to the approaches used so far and new developments that allow greater sensitivity and accuracy in uncovering the fate of Al in planta.
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