Plant and Soil

, Volume 354, Issue 1–2, pp 1–19 | Cite as

Plant growth and physiology under heterogeneous salinity

  • Nadia Bazihizina
  • Edward G. Barrett-Lennard
  • Timothy D. Colmer
Marschner Review



Soil salinity is heterogeneous, and within the root-zone of single plants the salinity of the soil solution can vary widely.


This review shows that water uptake by roots from the least saline part of the soil is the key factor driving shoot growth; plants with part of the root at low salinity (0–10 mM NaCl) had 3- to 10-fold higher shoot dry mass than plants with roots in uniformly saline (50–800 mM NaCl) media. Plants in heterogeneous salinity had shoot water potentials similar to those of plants growing in uniform low-salt media, and this was likely a result of uptake of low salinity water and reduced stomatal conductance. Under heterogeneous conditions, roots in saline media took up ions, resulting in higher shoot Na+ and Cl- concentrations compared with plants growing in low-salt media.


Results from split-root experiments complement knowledge of plant responses to uniform salinities; the next challenge is to develop new protocols so that this understanding can be extrapolated to more complex soil- and field-based systems. More work is also required to understand the physiological mechanisms underlying changes in stomatal conductance and shoot ion regulation in plants under heterogeneous salinities and how these are linked to the saline parts of the root-zone.


Halophytes Root-to-shoot signalling Salinity tolerance Soil salinity Split-root experiments Stomatal conductance Water relations Water uptake. 



We are grateful to the Director General of the Western Australian Department of Agriculture and Food for the permission to use Fig. 1a. We thank Dr. Karen Holmes (Centre for Ecohydrology) who redrew Fig. 1b from original data generously provided by Dr. Congjuan Li (Chinese Academy of Sciences). Dr. Rana Munns and three anonymous referees provided useful comments on the manuscript. NB thanks the Australian Government’s Endeavour Europe Award and The University of Western Australia Scholarship for International Fees. EBL received financial support from ACIAR Project LWR/2009/034. Support was also received from the School of Plant Biology (UWA), the Western Australian Government’s Centre for Ecohydrology and the Future Farm Industries Cooperative Research Centre.


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Nadia Bazihizina
    • 1
    • 2
  • Edward G. Barrett-Lennard
    • 1
    • 2
    • 3
  • Timothy D. Colmer
    • 1
    • 4
  1. 1.School of Plant BiologyThe University of Western AustraliaCrawleyAustralia
  2. 2.Centre for EcohydrologyThe University of Western AustraliaCrawleyAustralia
  3. 3.Department of Agriculture and Food of Western AustraliaThe University of Western AustraliaCrawleyAustralia
  4. 4.Institute of AgricultureThe University of Western AustraliaCrawleyAustralia

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