Efeitos dos rejeitos da indústria de zinco na anatomia e crescimento de plantas jovens de Salix humboldtiana Willd: (salgueiro)

Abstract

(Effects of tailings from zinc industry in the anatomy and growth of young plants of Salix humboldtiana Willd. (willow)). The heavy metal pollution caused mainly by mining and industrial activities requires studies for the recovery of contaminated areas. Thus, we studied growth and anatomical characteristics responses of young willow plants grown in heavy metal multicontaminated soil. Plants were grown in three mixture levels of contaminated soil: 0%, 15% and 30% (v/v) for 60 days. At the highest level of contamination was noted a less dry matter production of roots and shoots and reduced root growth. Accordingly, the roots exhibited epidermis, exodermis and endodermis thicker, and a smaller number of conducting elements of xylem. Leaves showed changes in the number of conducting elements of xylem diameter and density of stomata, and epidermis, endodermis, collenchyma and mesophyll cell thickness