Iron plaque formation and morphoanatomy of roots from species of restinga subjected to excess iron
- 作者：Advanio Iná ; cio Siqueira-Silva ; Luzimar Campos da Silva ; luzimar@ufv.br ; luzimarcampos@yahoo.com.br ; Aristé ; a Alves Azevedo ; Marco Antonio Oliva
- 关键词：Iron plaque ; Ipomoea pes-caprae ; Canavalia rosea ; Hydroponic culture ; Sandy coastal plain
- 刊名：Ecotoxicology and Environmental Safety
- 出版年：2012
- 期刊代码：77_01476513
- 类别：env
- 出版时间：1 April, 2012
- 卷：78
- 期：Complete
- 页码：265-275
- 文件大小：2497 K
摘要
The restingas, a sandy coastal plain ecosystem of Brazil, have received an additional amount of iron due to the activity of mining industries. The present study aims to characterize morphoanatomically and histochemically the iron plaque formation on roots of Ipomoea pes-caprae L. and Canavalia rosea DC, cultivated in hydroponic solution with and without excess iron. The iron plaque formation as well as changes in the external morphology of the lateral roots of both species were observed after the subjection to excess iron. Changes in the nutrient uptake, and in the organization and form of the pericycle and cortex cells were observed for both species. Scanning electron microscopy showed evident iron plaques on the whole surface of the root. The iron was histolocalized in all root tissues of both species. The species of restinga studied here formed iron plaque in their roots when exposed to excess of this element, which may compromise their development in environments polluted by particulated iron.