Guan'gai paishui xuebao (Jun 2023)

Distribution, Enrichment and Transport of Cd in Two Maize Varieties Grown in Soils with Different Cd Contents

  • XIAO Yatao,
  • WANG Dezhe,
  • LI Shixin,
  • WANG Long,
  • SUN Chaoxiang,
  • GUO Wei

DOI
https://doi.org/10.13522/j.cnki.ggps.2022407
Journal volume & issue
Vol. 42, no. 6
pp. 45 – 52

Abstract

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【Objective】 Cadmium is a heavy metal commonly seen in contaminated soils. Its uptake and translocation in plants depends on many factors. In this paper, we investigated the effect of soil Cd content on Cd uptake and its subsequent translocation and accumulation in two maize varieties. 【Method】 The experiment was conducted in a field, with Zhengdan 985 (ZD) and Xiangyu 335 (XY) varieties used as the model plants. Cd content in the soil varied from 0.16 mg/kg (CK) to 15.76 mg/kg. In each treatment, we measured the enrichment and translocation of Cd to each tissue organ and analyzed the correlation between soil Cd content and Cd content in different tissues and organs of the two varieties. 【Result】 In all treatments, Cd was mainly accumulated in the roots, leaves and bracts, followed by stalk and ear axis. Cd content in the seeds was 0.08%~5.12%, the lowest compared with that in other organs. Cd content in the seeds of ZD increased with the increase in soil Cd content, while the maximum Cd content in the seeds of XY was 0.26 mg/kg when the soil Cd content was 6.71 mg/kg. Analysis showed that the strongest enriching organ of ZD and XY was roots and the weakest was seeds. The enrichment of Cd in stems, leaves and bracts varied with soil Cd content, though there was a varietal difference. When soil Cd content was the same, the translocation of Cd in root-to-leaf and root-to-bud was the strongest, though there were a varietal difference and soil Cd effect. Cd content in the roots, stem, leaves, bract, rachis and seeds were significantly correlated with soil Cd content, with the correlation coefficient for the root, stem and leaf being 0.973, 0.961 and 0.963, respectively. 【Conclusion】 Distribution, enrichment and translocation of Cd in maize were affected by soil Cd content and the maize variety. Both ZD and XY grew healthily; there was only a limited Cd accumulation in their seeds when soil Cd content was 1.70~15.76 mg/kg, though the XY was more productive when soil Cd content was 1.70~6.71 mg/kg.

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