Morpho-anatomical and growth alterations induced by arsenic in Cajanus cajan (L.) DC (Fabaceae)

Environmental Science and Pollution Research International
Alice Pita-BarbosaAristéa Alves Azevedo

Abstract

Arsenic (As) is a toxic element to most organisms. Studies investigating anatomic alterations due to As exposure in plants are scarce but of utmost importance to the establishment of environmental biomonitoring techniques. So, this study aimed to investigate the effects of As on the development and initial root growth in Cajanus cajan (Fabaceae), characterize and quantify the possible damages, evaluate genotoxic effects, and identify structural markers to be used in environmental bioindication. Plants were exposed hydroponically to 0.5, 1.0, 1.5, and 2.0 mg As L(-1), as sodium arsenate. Growth parameters were measured, and in the end of the exposure, root samples were analyzed for qualitative and quantitative anatomical alterations. Arsenic genotoxicity was evaluated through analysis of the mitotic index in the root apex. Compared to the control, As-treated seedlings showed an altered architecture, with significantly decreased root length (due to the lower mitotic index in the apical meristem and reduced elongation of parenchyma cells) with darkened color, and abnormal development of the root cap. A significant increase in vascular cylinder/root diameter ratio was also detected, due to the reduction of the cellular spaces in th...Continue Reading

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Citations

Feb 6, 2018·Environmental Science and Pollution Research International·Naiara Viana CamposAristéa Alves Azevedo
Jul 30, 2020·International Journal of Phytoremediation·Regiane Aparecida CanattoBruno Éric Siqueira Albino
Dec 29, 2020·Plant Physiology and Biochemistry : PPB·Vaishali YadavMarek Vaculík

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