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Mechanism of Iodine Uptake by Cabbage: Effects of Iodine Species and Where It is Stored

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Abstract

Iodine-enhanced vegetable has been proven to be an effective way to reduce iodine deficiency disorders in many regions. However, the knowledge about what mechanisms control plant uptake of iodine and where iodine is stored in plants is still very limited. A series of controlled experiments, including solution culture, pot planting, and field experiments were carried out to investigate the uptake mechanism of iodine in different forms. A new methodology for observing the iodine distribution within the plant tissues, based on AgI precipitation reaction and transmission electron microscope techniques, has been developed and successfully applied to Chinese cabbage. Results show that iodine uptake by Chinese cabbage was more effective when iodine was in the form of IO3 − than in the form of I− if the concentration was low (<0.5 mg L−1), but the trend was opposite if iodine concentration was 0.5 mg L−1 or higher. The uptake was more sensitive to metabolism inhibitor in lower concentration of iodine, which implies that the uptake mechanism transits from active to passive as the iodine concentration increases, especially when the iodine is in the form of IO3 −. The inorganic iodine fertilizer provided a quicker supply for plant uptake, but the higher level of iodine was toxic to plant growth. The organic iodine fertilizer (seaweed composite) provided a more sustainable iodine supply for plants. Most of the iodine uptake by the cabbage is intercepted and stored in the fibrins in the root while the iodine that is transported to the above-ground portion (shoots and leaves) is selectively stored in the chloroplasts.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant no. 40373043). Thanks are due to Qinshi Pan for her editing review.

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Author notes

  1. Chun-Lai Hong

    Present address: Institute of Jiaxing Agricultural Science, Jiaxing, 314016, People’s Republic of China

Authors and Affiliations

  1. Department of Earth Sciences, Institute of Environment & Biogeochemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, People’s Republic of China

    Huan-Xin Weng, Chun-Lai Hong, Ai-Lan Yan, Ya-Chao Qin, Lü-Ting Bao & Ling-Li Xie

  2. Earth Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, One Cyclotron Road, MS: 90-1116, Berkeley, 94720, USA

    Le-Hua Pan

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  1. Huan-Xin Weng
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Correspondence to Huan-Xin Weng.

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Weng, HX., Hong, CL., Yan, AL. et al. Mechanism of Iodine Uptake by Cabbage: Effects of Iodine Species and Where It is Stored. Biol Trace Elem Res 125, 59–71 (2008). https://doi.org/10.1007/s12011-008-8155-2

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  • DOI: https://doi.org/10.1007/s12011-008-8155-2

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