Osmotic adjustment and energy limitations to plant growth in saline soil

Rana Munns, John B. Passioura, Timothy D. Colmer, Caitlin S. Byrt

Research output: Contribution to journalReview article

3 Citations (Scopus)

Abstract

Summary: 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.

Original languageEnglish
JournalNew Phytologist
DOIs
Publication statusE-pub ahead of print - 21 Apr 2019

Fingerprint

saline soils
Soil
plant growth
energy
Growth
solutes
Costs and Cost Analysis
Plant Roots
Water
Osmotic Pressure
Vacuoles
Cytoplasm
osmotic pressure
Ions
vacuoles
cytoplasm
water
ions
shoots
leaves

Cite this

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title = "Osmotic adjustment and energy limitations to plant growth in saline soil",
abstract = "Summary: 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.",
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Osmotic adjustment and energy limitations to plant growth in saline soil. / Munns, Rana; Passioura, John B.; Colmer, Timothy D.; Byrt, Caitlin S.

In: New Phytologist, 21.04.2019.

Research output: Contribution to journalReview article

TY - JOUR

T1 - Osmotic adjustment and energy limitations to plant growth in saline soil

AU - Munns, Rana

AU - Passioura, John B.

AU - Colmer, Timothy D.

AU - Byrt, Caitlin S.

PY - 2019/4/21

Y1 - 2019/4/21

N2 - Summary: 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.

AB - Summary: 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.

KW - barley

KW - chloride

KW - salt

KW - sodium

KW - wheat

KW - xylem

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DO - 10.1111/nph.15862

M3 - Review article

JO - The New Phytologist

JF - The New Phytologist

SN - 0028-646X

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