4.7 Article

The root iron transporter 1 governs cadmium uptake in Vicia sativa roots

Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 398, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122873

Keywords

Vicia sativa; Root iron transporter 1,Cd toxicity; Transient Cd influx; Competitive uptake

Funding

  1. National Key Research and Development Program of China [2016YFD0800700, 2016YFD0800800]
  2. Innovative Research Team Development Plan of the Ministry of Education of China [IRT_17R56]
  3. Fundamental Research Funds for the Central Universities of China [KYT201802]
  4. Natural Science Foundation of Colleges and Universities of Jiangsu Province [17KJB180014]
  5. GDAS' Project of Science and Technology Development [2020GDASYL-20200103059]

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Cadmium is a non-essential element for plants and that inhibits plant growth and development. The Zhangye Mawan (ZM) variety of Vicia sativa is more sensitive to Cd toxicity than that Lanjian 3# (L3) variety, but the underlying mechanism is not fully understood. Here, we demonstrated that ZM showed higher Cd accumulation than L3 based on root Cd content and Cd fluorescence intensity in root protoplasts. VsRIT1, a member of the ZIP (ZRT/IRT-like protein) family, showed expression levels in ZM roots 8-fold higher than those in L3 roots under Cd exposure. VsRIT1 expression increased Cd transport and accumulation in Arabidopsis and yeast. These suggests that VsRIT1 participates in Cd uptake by V. sativa roots. Furthermore, ZM root tips have a higher capacity for transient Cd influx than L3 roots when exposed to Cd alone or Cd and iron (Fe) together, owing to the higher VsRIT1 expression in ZM. Our findings also imply that Cd may compete with Fe or/and zinc (Zn) for uptake via VsRIT1 in V. sativa or yeast.

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