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| Variation in Cadmium and Lead Accumulation and Translocation among Pokchoi Cultivars under Hydroponic Condition |
| GUO Xiongchang2，SUI Xiuyu1，3，WU Yiyi1，XIN Zaijun1，SUN Xiaoyan1，2* |
| 1Jiangxi Heavy Metal Pollution Ecological Restoration Engineering Research Center，Institute of Microbiology，Nanchang 330096，Jiangxi，China；2Institute of Biological Resources，Nanchang 330096，Jiangxi，China；3Jiangxi Agricultural University，Nanchang 330006，Jiangxi，China |
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Abstract Seventeen pokchoi〔Brassica campestris L. ssp. chinensis（L.）Makino var. communis Tsen et Lee〕cultivars，conventionally planted in southern China，were selected to study their differences in biomass，tolerance index，cadmium（Cd）concentration，lead（Pb）concentration，translocation factor，and explore the interactive relationship between Cd and Pb under three treatments，including single Cd，single Pb，combined of Cd and Pb，by hydroponic experiments．Results showed that single Cd treatment and single Pb treatment inhibited the growth of most of pokchoi cultivars，but combined of Cd and Pb treatment alleviated the growth inhibition to varying degrees．There were significant different Cd and Pb concentrations in roots and shoots among seventeen pokchoi cultivars．Under single Cd treatment，Cd concentrations in shoots of seventeen pokchoi cultivars ranged from 103.4 to 183.0 mg · kg-1，while Cd translocation factors from roots to shoots ranged from 0.104 to 0.295．Under combined of Cd and Pb treatment，the Cd concentrations ranged from 69.4 to 142.1 mg · kg-1，while Cd translocation factors ranged from 0.104 to 0.222．Under single Pb treatment，the Pb concentrations in shoots of seventeen pokchoi cultivars ranged from 21.64 to 75.19 mg · kg-1，and the translocation factors ranged from 0.057 to 0.283．Under combined of Cd and Pb treatment，the lead concentrations in shoots of seventeen pokchoi cultivars ranged from 12.66 to 31.91 mg · kg-1，while Pb translocation factors ranged from 0.027 to 0.187．Cd and Pb mostly accumulated in roots，and root fixation ability to Pb was significantly higher than that of Cd．The concentrations of Cd and Pb in shoots were significantly decreased under combined of Cd and Pb，when compared with single Cd or single Pb treatment，indicating that there was a competitive antagonistic effect on the uptake and translocation of Cd and Pb．‘Zhengwangda 88 xiaobaicai’‘Zhongshukuaicai No.1’‘Shengcuikuaicai’always showed lower Pb concentrations in shoots under Pb with or without Cd treatment，suggesting these cultivars had a lower risk on Pb accumulation in heavy metal-contaminated soils．
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Received: 27 April 2022
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