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|Title:||Osmotic adjustment and energy limitations to plant growth in saline soil|
|Citation:||New Phytologist, 2019; 225(3):1-6|
|Publisher:||John Wiley & Sons|
|Rana Munns, John B. Passioura, Timothy D. Colmer, Caitlin S. Byrt|
|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.|
|Rights:||© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust|
|Appears in Collections:||Agriculture, Food and Wine publications|
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