Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/12917
Tipo: Artigo
Título: Morphoanatomical responses induced by excess iron in roots of two tolerant grass species
Autor(es): Araújo, Talita Oliveira de
Freitas-Silva, Larisse de
Santana, Brenda Vila Nova
Kuki, Kacilda Naomi
Pereira, Eduardo Gusmão
Azevedo, Aristéa Alves
Silva, Luzimar Campos da
Abstract: We aimed to verify whether morphoanatomic alterations occur in response to excess iron, in roots of Setaria parviflora and Paspallum urvillei (Poaceae), and to localize the presence of the sites of iron accumulation. Plants were subjected to 0.009, 1, 2, 4, and 7 mM Fe-EDTA in nutrient solution. Both species presented iron contents in the roots above the critical toxicity level. The presence of iron plaque on roots of the two species was confirmed, and it may have reduced iron absorption by the plants. Roots from the two species showed typical visual symptoms of stress by excess iron: change in color and mucilaginous and flaccid appearance. Anatomical damage was observed in both species: aerenchyma disruption, alterations in endodermal cells, and irregular shape of both vessel and sieve tube elements. The metal was histolocalized in the cortex and in protoxylem and metaxylem cell walls in both species, which suggests a detoxification strategy for the excess iron. Phenolic compounds were not histolocalized in roots. Microscopic analyses were therefore effective in evaluating the real damage caused by excess iron.
Palavras-chave: Setaria parviflora
Paspallum urvillei
Poaceae
Symptomatology
Histochemistry
Energy dispersive X-ray (EDX)
Editor: Environmental Science and Pollution Research
Tipo de Acesso: Open Access
URI: http://dx.doi.org/10.1007/s11356-014-3488-1
http://www.locus.ufv.br/handle/123456789/12917
Data do documento: 31-Ago-2014
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