The dual benefit of arbuscular mycorrhizal fungi under soil zinc deficiency and toxicity: linking plant physiology and gene expression

  • Stephanie J. Watts-Williams
  • Stephen D. Tyerman
  • Timothy R. Cavagnaro
Regular Article

Abstract

Background and aims

Colonisation of roots by arbuscular mycorrhizal fungi (AMF) can increase plant biomass and nutrition under soil zinc (Zn) deficiency and toxicity conditions, but the genes and transporters involved in these processes are unknown. The aim here was to determine whether there is a ZIP (Zrt-, Irt-like protein) transporter gene that is differentially-regulated by mycorrhizal colonisation that may be involved in mycorrhizal Zn uptake.

Methods

We grew Medicago truncatula plants at soil Zn concentrations ranging from deficient to toxic, with and without inoculation of the AMF Rhizophagus irregularis, and measured plant dry weight, shoot nutrient concentrations and the expression of phosphate, aquaporin and ZIP genes in the roots.

Results

At low and high soil Zn concentrations, there were positive biomass responses to AMF colonisation. Furthermore, at low soil Zn concentrations, MtZIP6 was highly up-regulated in the mycorrhizal plants. With increasing soil Zn concentration, expression of the AMF-induced phosphate transporter gene MtPT4 increased, and mycorrhizal colonisation was maintained.

Conclusions

We have identified two different mechanisms by which AMF colonisation can increase plant biomass under low and high Zn stress: first, up-regulation of MtZIP6 at low soil Zn to supplement Zn uptake from the rhizosphere; and second, persistence of mycorrhizal colonisation and expression of MtPT4, which at high Zn could promote increased plant biomass and reduced tissue Zn concentration.

Keywords

Aquaporin Arbuscular mycorrhizal fungi Medicago truncatula Phosphate transporter Rhizophagus irregularis Zinc ZIP transporter 

Supplementary material

11104_2017_3409_MOESM1_ESM.docx (1 mb)
ESM 1(DOCX 1046 kb)

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.School of Agriculture, Food and Wine, Waite Research InstituteUniversity of AdelaideGlen OsmondAustralia
  2. 2.Australian Research Council Centre of Excellence in Plant Energy BiologyUniversity of AdelaideGlen OsmondAustralia

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