Plant and Soil

, Volume 424, Issue 1–2, pp 451–462 | Cite as

Does the major aluminium-resistance gene in wheat, TaALMT1, also confer tolerance to alkaline soils?

  • Carolina M. S. Silva
  • Chunyan Zhang
  • Gustavo Habermann
  • Emmanuel Delhaize
  • Peter R. Ryan
Regular Article

Abstract

Aim

A major limitation to plant growth in acid soils is the prevalence of toxic Al3+. Most genotypic variation for acid soil-tolerance in wheat is linked with the Al3+-activated efflux of malate anions from roots which is controlled by TaALMT1 on chromosome 4DL. Recent studies have also linked TaALMT1 with tolerance to high pH solutions and alkaline soils. This study tested the hypothesis that an Al3+-resistant allele of TaALMT1 also confers tolerance to alkaline conditions.

Methods

The near-isogenic wheat lines, ET8 (Al3+-resistant) and ES8 (Al3+-sensitive), have different alleles of the TaALMT1 gene and contrasting resistance to Al3+ toxicity. Growth of these lines was compared in acid and alkaline soils with contrasting mineralogy and in a range of high pH hydroponic solutions of varying composition.

Results

No consistent differences in root or shoot growth were detected between the lines in the alkaline soils or in the high pH hydroponic treatments. Malate efflux was detected from ET8 in acidic solution with Al3+ but no substantial malate efflux was detected at pH 9.0 treatment with added Na2SO4.

Conclusion

The results are inconsistent with the hypothesis that the TaALMT1 gene confers an advantage to wheat on alkaline soils.

Keywords

Wheat Malate TaALMT1 Aluminum Resistance Tolerance Alkaline Acidic Soil Boron 

Notes

Acknowledgements

The authors are grateful to Glenn McDonald, Rhiannon Schilling, Ian Richter and Naomi Scholz for providing alkaline soils from South Australia. We thank Kumara Weligama for assistance in characterizing the soils. Carolina Silva’s research was supported by the São Paulo Research Foundation (Fapesp) in Brazil.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.CSIRO Agriculture and FoodCanberraAustralia
  2. 2.Botanics departmentSao Paulo State University UNESPRio ClaroBrazil
  3. 3.Chengdu Institute of BiologyChinese Academy of SciencesChengduChina

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