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Abstract

Background and aims:Salinity stress tolerance is a complex polygenic trait composed of numerous sub-traits that operate at very different timescales. This work elucidates the time-dependence and physiological mechanisms conferring differential salinity stress tolerance between Atriplex lntiformis (halophyte) and Medicago arborea (glycophyte) exposed to prolonged NaCl treatments grown in various soil types.Methods:Plant (leaf sap Na+, K+ and Cl− concentrations and osmolality, chlorophyll content, stomatal conductance) and soil characteristic (pH, soil and leachate electrical conductivity) were measured at monthly intervals for up to five months of salinity treatments and then correlated with each other.Results and conclusions:The overall poor performance of salt-grown M. arborea (compared with A. lentiformis) was associated with several factors. This included: (i) its strong reliance on organic osmolytes (hence, associated carbon costs) for osmotic adjustment; (ii) poor K+ retention that compromised stomatal opening; (iii) its inability to prevent Na+ loading into the xylem; and (iv) its poor shoot tissue tolerance, most likely due to inability to provide efficient Na+ sequestration in vacuoles. Also, the salinity of sandy loam soil was only ∼50% of the salinity of irrigation water suggesting the possibility of long-term usage of saline irrigation in soils with low clay content.

Item Type:	Article
Authors/Creators:	Panta, S and Flowers, T and Doyle, R and Lane, P and Haros, G and Shabala, S
Keywords:	salinity stress, osmotic adjustment, soil texture, osmolytes, sodium, potassium, stomata, salinity, halophyte
Journal or Publication Title:	Plant and Soil
Publisher:	Kluwer Academic Publ
ISSN:	0032-079X
DOI / ID Number:	https://doi.org/10.1007/s11104-018-3793-4
Copyright Information:	Copyright 2018 Springer Nature Switzerland AG
Related URLs:	Google Scholar: Doyle, R UTAS Profile: Doyle, R UTAS Profile: Lane, P Google Scholar: Shabala, S UTAS Profile: Shabala, S
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