期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 91, 期 -, 页码 147-155出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2013.01.017
关键词
Peanut; Cultivar variation; Cadmium accumulation; Root morphology
资金
- National Natural Science Foundation of China [31171464]
- Anhui Provincial Natural Science Foundation [11040606M87]
- Natural Science Foundation for College of Anhui Province [KJ2012B161]
This study aimed to test the hypothesis that root morphology may play a crucial role in the variation in Cd accumulation among peanut (Arachis hypogaea L.) cultivars. The biomass, Cd accumulation and root morphology of five peanut cultivars were determined under 2 and 20 mu M CdCl2 in a hydroponic experiment. Excess Cd considerably decreased the root lengths (RL), surface area (SA), specific root length (SRL) and number of root tips, but increased the root diameters (RD). Cd-induced decreases in RL and SA were significant in the 0-0.2 and 0.2-0.4 mm diameter classes. Peanut cultivars differ in Cd accumulation and root morphological parameters. A positive correlation was observed between RL and Cd amount in shoots. RD negatively correlated to Cd concentrations in roots and shoots. Positive correlations were also found between RL vs. shoot Cd concentration, SA vs. Cd amount in shoots, SRL vs. root Cd concentration, SRL vs. shoot Cd concentration, and SRL vs. Cd amount in shoots. The fine roots play a crucial role in determining Cd accumulation in peanut plants. Cultivars with more fine roots in their root system (i.e. Haihua 1 and Zhenghong 3) have high capability of Cd accumulation. (c) 2013 Elsevier Inc. All rights reserved.
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