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Authors Lee, G; Carrow, RN; Duncan, RR; Eiteman, MA; Rieger, MW
Author Full Name Lee, Geungjoo; Carrow, Robert N.; Duncan, Ronny R.; Eiteman, Mark A.; Rieger, Mark W.
Title Synthesis of organic osmolytes and salt tolerance mechanisms in Paspalum vaginatum
Source ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Language English
Document Type Article
Author Keywords salinity; seashore paspalum; compatible osmolytes; proline
Keywords Plus SALINITY TOLERANCE; OSMOTIC ADJUSTMENT; WATER-STRESS; RESPONSES; GROWTH; PLANTS; GRASS; SUGAR
Abstract Synthesis of organic compounds in response to salinity stress and their contribution to organic osmotic adjustment were investigated in seashore paspalum (Paspalum vaginatum Swartz). Nine genotypes exhibiting the widest range of salt tolerance were grown in sea-salt amended nutrient solution in a greenhouse. Salinity ranges were 1.1 (EC(w)0, control) to 49.7dSm(-1) (EC(w)50) based on electrical conductivity of the solution (ECw). Organic osmolytes most important within seashore paspalum under salinity stress were proline, Gly-betaine, and trigonelline in terms of explaining intraspecific salt tolerance differences and, therefore, should be the focus of biotechnology approaches to enhance these traits. While these osmolytes differed in accumulation with increasing salinity and absolute concentrations among salt tolerant and intolerant genotypes, the magnitude of responses was not sufficiently large to suggest use for salt screening as physiological/biochemical markers. Fructose concentration increased with salinity, especially for salt sensitive ecotypes, and may have potential as a marker. Glucose, sucrose, and myo-inositol tended to increase with salinity, but changes did not relate to intraspecific salt tolerance, while mannitol and sorbitol were not affected by salinity. Proline demonstrated a 20.8-fold increase averaged across genotypes from ECwO to EC(w)50 salinity. Proline was the primary organic osmolyte for osmotic adjustment accounting for an average of 9.3% to total solute potential (Psi(s)) at EC(w)50 and 56% of the organic solute contribution to Psi(s). In the salt tolerant genotype, SI 93-2, proline and Gly-betaine exhibited greater absolute concentration and accumulation rate relative to the least salt tolerant, Adalayd. The intraspecific role of Gly-betaine did not relate to osmotic adjustment differences, suggesting another role perhaps in protection of the thylakoid membrane. (c) 2007 Elsevier B.V. All rights reserved.
Author Address [Lee, Geungjoo; Carrow, Robert N.; Duncan, Ronny R.] Univ Georgia, Dept Crop & Soil Sci, Griffin, GA 30221 USA; [Eiteman, Mark A.] Univ Georgia, Dept Biol & Agr Engn, Athens, GA 30602 USA; [Rieger, Mark W.] Univ Florida, Coll Agr & Life Sci, Off Associate Dean, Gainesville, FL 32611 USA
Reprint Address Carrow, RN (corresponding author), Univ Georgia, Dept Crop & Soil Sci, Griffin, GA 30221 USA.
E-mail Address rcarrow@uga.edu
ORCID Number Lee, Geung-Joo/0000-0002-3774-1860; Eiteman, Mark/0000-0002-6155-6446
Times Cited 81
Total Times Cited Count (WoS, BCI, and CSCD) 91
Publisher PERGAMON-ELSEVIER SCIENCE LTD
Publisher City OXFORD
Publisher Address THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
ISSN 0098-8472
29-Character Source Abbreviation ENVIRON EXP BOT
ISO Source Abbreviation Environ. Exp. Bot.
Publication Date MAY
Year Published 2008
Volume 63
Issue 1-3
Beginning Page 19
Ending Page 27
Digital Object Identifier (DOI) 10.1016/j.envexpbot.2007.10.009
Page Count 9
Web of Science Category Plant Sciences; Environmental Sciences
Subject Category Plant Sciences; Environmental Sciences & Ecology
Document Delivery Number 283YF
Unique Article Identifier WOS:000254671700003
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