title: Assessment of the root system of Brassica juncea (L.) czern. and Bidens pilosa L. exposed to lead polluted soils using rhizobox systems.
abstract: The purpose of this study was to compare the behavior of the root system of one of the most frequently cited species in phytoremediation Indian mustard [Brassica juncea (L.) Czern.] and a representative perennial herb (Bidens pilosa L.) native of Argentina, for different concentrations of lead in soils through chemical and visualization techniques of the rhizosphere. Lead polluted soils from the vicinity of a lead recycling plant in the locality of Bouwer, were used in juxtaposed rhizobox systems planted with seedlings of B. juncea and B. pilosa with homogeneous and heterogeneous soil treatments. Root development, pH changes in the rhizosphere, dry weight biomass, lead content of root and aerial parts and potential extraction of lead by rhizosphere exudates were determined. In both species lead was mainly accumulated in roots. However, although B. juncea accumulated more lead than B. pilosa at elevated concentrations in soils, the latter achieved greater root and aerial development. No changes in the pH of the rhizosphere associated to lead were observed, despite different extractive potentials of lead in the exudates of the species analyzed. Our results indicated that Indian mustard did not behave as a hyperaccumulator in the conditions of the present study.
authors: a Multidisciplinary Institute of Plant Biology, Pollution and Bioindicator section, Faculty of Physical and Natural Sciences , National University of Córdoba , Av. Vélez Sársfield, Córdoba , Argentina.
authors: Natalia Soledad
authors: NS
authors: Graziani
authors: a Multidisciplinary Institute of Plant Biology, Pollution and Bioindicator section, Faculty of Physical and Natural Sciences , National University of Córdoba , Av. Vélez Sársfield, Córdoba , Argentina.
authors: María Julieta
authors: MJ
authors: Salazar
authors: a Multidisciplinary Institute of Plant Biology, Pollution and Bioindicator section, Faculty of Physical and Natural Sciences , National University of Córdoba , Av. Vélez Sársfield, Córdoba , Argentina.
authors: María Luisa
authors: ML
authors: Pignata
authors: a Multidisciplinary Institute of Plant Biology, Pollution and Bioindicator section, Faculty of Physical and Natural Sciences , National University of Córdoba , Av. Vélez Sársfield, Córdoba , Argentina.
authors: Judith Hebelen
authors: JH
authors: Rodriguez
mesh_terms: D031176:Bidens / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018533:Biomass; D007854:Lead / Q000378:metabolism*; D009149:Mustard Plant / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D018517:Plant Roots / Q000737:chemistry / Q000254:growth & development* / Q000378:metabolism; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D007854:Lead
keywords: B. juncea; B. pilosa; Pb; phytoremediation; rhizobox; rhizosphere