Assessment of the root system of Brassica juncea (L.) Czern. and Bidens pilosa L. exposed to lead polluted soils using rhizobox systems.

NATALIA S. GRAZIANI; DRA. M. JULIETA SALAZAR; DRA. M. L. PIGNATA; DRA. J. H. RODRIGUEZ

INTERNATIONAL JOURNAL OF PHYTOREMEDIATION

TAYLOR & FRANCIS INC

Lugar: Londres; Año: 2016 vol. 18 p. 235 - 244

1522-6514

The purpose of this study was to compare the behaviorof the root system of one of the most frequently cited species inphytoremediation Indian mustard [Brassicajuncea (L.) Czern.] and a representative perennial herb (Bidens pilosa L.) which is a nativespecies in Argentina, and globally distributed, for different concentrations oflead in soils through chemical and visualization techniques of the rhizosphere.Lead polluted soils (from 1.85 to 981 µg g-1 Pb) from the vicinityof a lead recycling plant in the locality of Bouwer, were used in juxtaposedrhizobox systems planted with seedlings of B.juncea and B. pilosa with homogeneousand heterogeneous soil treatments. Root development,pH changes in the rhizosphere, dry weight of roots and aerial parts, leadcontent of root and aerial parts and potential extraction of lead byrhizosphere exudates were determined. In both species leadwas mainly accumulated in roots. However, although B. juncea accumulated significantly more lead than B. pilosa at elevated concentrations insoils, the latter achieved greater root and aerial development. No changes inthe pH of the rhizosphere associated to lead were observed, despite differentextractive potentials of lead in the exudates of the species analyzed beingobserved. Our results indicated that Indian mustard did not behave as ahyperaccumulator.