Cadmium Induces Changes in Sucrose Partitioning, Invertase Activities, and Membrane Functionality in Roots of Rangpur Lime (Citrus limonia L. Osbeck)

G. Podazza; M. Rosa; J. A. González; M. Hilal; F. E. Prado

doi:10.1055/s-2006-924171

Plant Biology, Table of Contents

Plant Biol (Stuttg) 2006; 8(5): 706-714
DOI: 10.1055/s-2006-924171

Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Cadmium Induces Changes in Sucrose Partitioning, Invertase Activities, and Membrane Functionality in Roots of Rangpur Lime (Citrus limonia L. Osbeck)

G. Podazza¹ , M. Rosa² , J. A. González¹ , M. Hilal² , F. E. Prado²

¹Fundación Miguel Lillo, Area Botánica. Miguel Lillo 251 CP 4000 Tucumán, Argentina
²Cátedra de Fisiología Vegetal, Facultad de Ciencias Naturales e IML. Miguel Lillo 205 CP 4000 Tucumán, Argentina

Abstract

Cadmium (Cd) uptake effects on sucrose content, invertase activities, and plasma membrane functionality were investigated in Rangpur lime roots (Citrus limonia L. Osbeck). Cadmium accumulation was significant in roots but not in shoots and leaves. Cadmium produced significant reduction in roots DW and increment in WC. Leaves and shoots did not show significant differences on both parameters. Sucrose content was higher in control roots than in Cd-exposed ones. Apoplastic sucrose content was much higher in Cd-exposed roots than in control ones. Cd-exposed roots showed a significant decrease in both cell wall-bound and cytoplasmic (neutral) invertase activities; while the vacuolar isoform did not show any change. Alterations in lipid composition and membrane fluidity of Cd-exposed roots were also observed. In Cd-exposed roots phospholipid and glycolipid contents decreased about 50 %, while sterols content was reduced about 22 %. Proton extrusion was inhibited by Cd. Lipid peroxidation and proton extrusion inhibition were also detected by histochemical analysis. This work's findings demonstrate that Cd affects sucrose partitioning and invertase activities in apoplastic and symplastic regions in Rangpur lime roots as well as the plasma membrane functionality and H⁺-ATPase activity.

Key words

Cd - Citrus limonia - invertases - membrane - roots - sucrose.

Full Text

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F. E. Prado

Fac. de Ciencias Naturales e IML

Miguel Lillo 205

4000 Tucumán

Argentina

Email: pra@tucbbs.com.ar

Editor: J. Schroeder