Journal of Ecology and Rural Environment ›› 2023, Vol. 39 ›› Issue (4): 547-555.doi: 10.19741/j.issn.1673-4831.2022.0123

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Cadmium Accumulation and Pollution Reduction Potential of Different Rice Varieties on Cadmium-contaminated Soils

SHEN Yi-chen1,2, TU Chen1,2,3, QIU Wei1, ZHU Xia1,2, FAN Wan-yi1,2, CAO Zhen-yu1,2, ZHU Xiao-fang4, LUO Yong-ming1,2   

  1. 1. Key Laboratory of Soil Environment and Pollution Remediation/Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Key Laboratory of Coastal Environmental Processes and Ecological Remediation/Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
    4. State Key Laboratory of Soil and Sustainable Agriculture/Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
  • Received:2022-02-18 Published:2023-04-25

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Abstract: In order to compare the cadmium (Cd) accumulation capacity of different rice varieties in Cd-contaminated soils, and to screen the high Cd-accumulating rice varieties with strong pollution reduction potential, pot experiments were conducted in this study to analyze the agronomic traits and Cd accumulation characteristics of 6 different rice varieties on two Cd-contaminated soils with Cd concentration of 0.41 mg·kg-1 (slightly polluted soil) and 0.80 mg·kg-1 (mildly polluted soil), respectively. The changes in CaCl2 extractable and NH4OAc extractable Cd content in the soil after the removal of the rice plants were also compared. The results show that rice varieties Luyou 616 (Lu-616), 383 and Yangdao 6 (9311) had larger aboveground biomass, and the Cd contents in their shoots and unpolished rice were significantly higher than those of other varieties. The aboveground bioaccumulation factors (BCF) of these rice varieties were > 1. Meanwhile, rice varieties 371 and Huanghuazhan (HHZ) showed lower Cd accumulation capability, and the Cd accumulation capability of all the rice varieties were consistent with the single nucleotide polymorphism (SNP) test of their Cd-accumulation related molecular markers. In the slightly Cd-polluted soil, the amount of Cd uptake by the rice varieties Lu-616 and 9311 were 40.11 and 22.24 μg per pot, respectively. In the mildly Cd-polluted soil, the amount of Cd uptake by rice varieties Lu-616, 383 and 9311 were 127.46, 93.76 and 90.58 μg per pot, respectively. After rice harvest, both the CaCl2 and NH4OAc extractable Cd in the mildly polluted soil were decreased compared to the unplanted control except for the variety HHZ, and the reduction rate of CaCl2 extractable Cd was higher than that of NH4OAc extractable Cd. The reduction rates of NH4OAc-extractable Cd in the soil planted with rice varieties Lu-616, 383 and 9311 reached to 14.36%, 21.29% and 14.47%, respectively. The uptake of Cd in the aboveground parts of rice were positively correlated with the reduction of CaCl2 and NH4OAc extractable Cd in soil. The results of the study may provide a plant solution to the remediation of Cd-contaminated paddy soils.

Key words: cadmium, rice varieties, phytoremediation, bioavailable fraction, pollution reduction potential

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