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Energy costs of salt tolerance in crop plants

Munns, R, Day, DA, Fricke, W, Watt, M, Arsova, B, Barkla, BJ, Bose, J, Byrt, CS, Chen, Z-H, Foster, KJ, Gilliham, M, Henderson, SW, Jenkins, CLD, Kronzucker, HJ, Miklavcic, SJ, Plett, D, Roy, SJ, Shabala, S ORCID: 0000-0003-2345-8981, Shelden, MC, Soole, KL, Taylor, NL, Tester, M, Wege, S, Wegner, LH and Tyerman, SD 2020 , 'Energy costs of salt tolerance in crop plants' , New Phytologist, vol. 225, no. 3 , pp. 1072-1090 , doi: 10.1111/nph.15864.

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Abstract

Agriculture is expanding into regions that are affected by salinity. This review considers the energetic costs of salinity tolerance in crop plants and provides a framework for a quantitative assessment of costs. Different sources of energy, and modifications of root system architecture that would maximize water vs ion uptake are addressed. Energy requirements for transport of salt (NaCl) to leaf vacuoles for osmotic adjustment could be small if there are no substantial leaks back across plasma membrane and tonoplast in root and leaf. The coupling ratio of the H+‐ATPase also is a critical component. One proposed leak, that of Na+ influx across the plasma membrane through certain aquaporin channels, might be coupled to water flow, thus conserving energy. For the tonoplast, control of two types of cation channels is required for energy efficiency. Transporters controlling the Na+ and Cl− concentrations in mitochondria and chloroplasts are largely unknown and could be a major energy cost. The complexity of the system will require a sophisticated modelling approach to identify critical transporters, apoplastic barriers and root structures. This modelling approach will inform experimentation and allow a quantitative assessment of the energy costs of NaCl tolerance to guide breeding and engineering of molecular components.

Item Type: Article
Authors/Creators:Munns, R and Day, DA and Fricke, W and Watt, M and Arsova, B and Barkla, BJ and Bose, J and Byrt, CS and Chen, Z-H and Foster, KJ and Gilliham, M and Henderson, SW and Jenkins, CLD and Kronzucker, HJ and Miklavcic, SJ and Plett, D and Roy, SJ and Shabala, S and Shelden, MC and Soole, KL and Taylor, NL and Tester, M and Wege, S and Wegner, LH and Tyerman, SD
Keywords: energy, salinity, sodium, chloride, membrane transport
Journal or Publication Title: New Phytologist
Publisher: Blackwell Publishing Ltd
ISSN: 0028-646X
DOI / ID Number: 10.1111/nph.15864
Copyright Information:

Copyright 2019 The Authors

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