Cadmium re-distribution from pod and root zones and accumulation by peanut (Arachis hypogaea L.)

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• 作者：Kairong Wang ; Ningning Song ; Qiaoqiao Zhao…
• 关键词：Cadmium ; Peanut ; Uptake ; Translocation ; Genotypic variation ; Food safety
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：23
• 期：2
• 页码：1441-1448
• 全文大小：431 KB
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• 作者单位：Kairong Wang (1)
  Ningning Song (1)
  Qiaoqiao Zhao (1)
  S. E. A. T. M. van der Zee (2)
  
  1. Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao, 266109, China
  2. Department of Soil Physics and Land Management, Wageningen University, P.O. Box 47, 6700 AA, Wageningen, The Netherlands
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Peanut (Arachis hypogaea L.) genotypes may differ greatly with regard to cadmium (Cd) accumulation, but the underlying mechanisms remain unclear. To determine the key factors that may contribute to Cd re-distribution and accumulation in peanut genotypes with different Cd accumulating patterns, a split-pot soil experiment was conducted with three common Chinese peanut cultivars (Fenghua-6, Huayu-20, and Huayu-23). The growth medium was separated into pod and root zones with varied Cd concentrations in each zone to determine the re-distribution of Cd after it is taken up via different routes. The peanut cultivars were divided into two groups based on Cd translocation efficiency as follows: (1) high internal Cd translocation efficiency cultivar (Fenghua-6) and (2) low internal Cd translocation efficiency cultivars (Huayu-20 and Huayu-23). Compared with Fenghua-6, low Cd translocation cultivars Huayu-20 and Huayu-23 showed higher biomass production, especially in stems and leaves, leading to dilution of metal concentrations. Results also showed that Cd concentration in roots increased significantly with increasing Cd concentrations in soils when Cd was applied in the root zone. However, there were no significant differences in the root Cd concentrations between different pod zone Cd treatments and the control, suggesting that root uptake, rather than pod uptake, is responsible for Cd accumulation in the roots of peanuts. Significant differences of Cd distribution were observed between pod and root zone Cd exposure treatments. The three peanut cultivars revealed higher kernel over total Cd fractions for pod than for root zone Cd exposure if only extra applied Cd was considered. This suggests that uptake through peg and pod shell might, at least partially, be responsible for the variation in Cd re-distribution and accumulation among peanut cultivars. Cd uptake by plants via two routes (i.e., via roots and via pegs and pods, respectively) and internal Cd translocation appear to be important mechanisms in determining Cd accumulation in the kernels of peanuts. Keywords Cadmium Peanut Uptake Translocation Genotypic variation Food safety