Abstract
Aims
This study evaluated the effect of phloem translocation on Ni accumulation in the hyperaccumulator Noccaea caerulescens.
Methods
The first experiment assessed the metal and organic compound concentrations in phloem sap. Leaves were cut from plants grown in nutrient solutions added with 100 μM Ni or Zn, and then used for phloem sap extraction by means of the EDTA-stimulated exudation method. In the second experiment, 61Ni2+ was applied to old leaves as a foliar spray to assess bidirectional movement of Ni in phloem.
Results
In the first experiment, enrichment of Ni or Zn was found in phloem exudates, indicating high Ni and Zn phloem loading and translocation capacity in N. caerulescens. Amino acids, e.g. nicotianamine and histidine, were present at low concentrations in exudates, which are insufficient for Ni and Zn chelation. On the contrary, concentrations of organic acids, especially malate, were high in all treatments, which may be involved in Ni and Zn chelation in phloem. The second experiment showed that 89 % of 61Ni exported from old leaves was translocated upward to young leaves, whereas only 11 % moved downward to roots.
Conclusions
Phloem sap of N. caerulescens is enriched in Ni and malate, the majority of which moves upward to young tissues. Phloem translocation may play an important role for Ni accumulation in young leaves of N. caerulescens.
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Acknowledgments
We thank Dr. Zhang Renduo and Dr. Wang Shizhong for their constructive comments on this study. This work was supported by the National Natural Science Foundation of China (No. 41371315, No. 41225004), the Fundamental Research Funds for the Central Universities (No.15lgjc36) and Special Fund of Environmental Protection Research for Public Welfare (No. 20150937).
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Deng, THB., Tang, YT., van der Ent, A. et al. Nickel translocation via the phloem in the hyperaccumulator Noccaea caerulescens (Brassicaceae). Plant Soil 404, 35–45 (2016). https://doi.org/10.1007/s11104-016-2825-1
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DOI: https://doi.org/10.1007/s11104-016-2825-1