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Review
. 2020 Feb;225(3):1091-1096.
doi: 10.1111/nph.15862. Epub 2019 May 21.

Osmotic adjustment and energy limitations to plant growth in saline soil

Rana Munns  1   2 , John B Passioura  2 , Timothy D Colmer  3 , Caitlin S Byrt  4   5
Affiliations
Free article
Review

Osmotic adjustment and energy limitations to plant growth in saline soil

Rana Munns et al. New Phytol. 2020 Feb.
Free article

Abstract

Plant roots must exclude almost all of the Na+ and Cl- in saline soil while taking up water, otherwise these ions would build up to high concentrations in leaves. Plants evaporate c. 50 times more water than they retain, so 98% exclusion would result in shoot NaCl concentrations equal to that of the external medium. Taking up just 2% of the NaCl allows a plant to osmotically adjust the Na+ and Cl- in vacuoles, while organic solutes provide the balancing osmotic pressure in the cytoplasm. We quantify the costs of this exclusion by roots, the regulation of Na+ and Cl- transport through the plant, and the costs of osmotic adjustment with organic solutes in roots.

Keywords: barley; chloride; salt; sodium; wheat; xylem.

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Comment in

  • The salinity challenge.
    Sanders D. Sanders D. New Phytol. 2020 Feb;225(3):1047-1048. doi: 10.1111/nph.16357. New Phytol. 2020. PMID: 31894589 Free PMC article.

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