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 language | English |
|---|---|
| Journal | New Phytologist |
| DOIs | |
| Publication status | E-pub ahead of print - 21 Apr 2019 |
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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 journal › Review 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
UR - http://www.scopus.com/inward/record.url?scp=85066095058&partnerID=8YFLogxK
U2 - 10.1111/nph.15862
DO - 10.1111/nph.15862
M3 - Review article
JO - The New Phytologist
JF - The New Phytologist
SN - 0028-646X
ER -