Osmotic adjustment and energy limitations to plant growth in saline soil. Issue 3 (21st May 2019)

• Record Type: Journal Article
• Authors: Munns, Rana; Passioura, John B.; Colmer, Timothy D.; Byrt, Caitlin S.
• Is Part Of: New phytologist. Volume 225:Issue 3(2020)
• Page Start: 1091
• Page End: 1096
• Publication Date: 2019-05-21
• Subjects: barley -- chloride -- salt -- sodium -- wheat -- xylem; Botany -- Periodicals; 580
• DOI: 10.1111/nph.15862
• Languages: English
• ISSNs: 0028-646X

Abstract

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. Abstract : See also the Commentary on this article by Sanders, 225 : 1047–1048 .