Acta Physiologiae Plantarum

, Volume 34, Issue 2, pp 495–502 | Cite as

The decline in potassium concentration is associated with cadmium toxicity of rice seedlings

Original Paper

Abstract

Cadmium (Cd) is one of the most dangerous environmental pollutants, among other things, affecting plant mineral composition. Thus, in this study, we investigated the changes in potassium (K) concentration in Cd-treated rice (Oryza sativa L.) seedlings of two cultivars. On treatment with 5 μM CdCl2, the Cd concentration increased in the shoot and roots of Cd-sensitive cultivar (cv. Taichung Native 1, TN1) but not or slightly in the Cd-tolerant cultivar (cv. Tainung 67, TNG67). The decrease in K concentration in the shoot and roots of TN1 caused by Cd was more pronounced than that of TNG67. Exogenous addition of KCl decreased Cd concentration and reduced Cd toxicity of TN1 seedlings. Evidence presented in this study suggests that the improvement of K status is able to reduce toxicity of rice seedlings to CdCl2.

Keywords

Cadmium Antioxidant system Potassium Rice 

Abbreviations

APX

Ascorbate peroxidase

AsA

Ascorbic acid

CAT

Catalase

DW

Dry weight

FW

Fresh weight

GR

Glutathione reductase

ROS

Reactive oxygen species

MDA

Malondialdehyde

SOD

Superoxide dismutase

TN1

Taichung native 1

TNG67

Tainung 67

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2011

Authors and Affiliations

  1. 1.Department of AgronomyNational Taiwan UniversityTaipeiTaiwan, ROC

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