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Hydraulic redistribution: limitations for plants in saline soils

Citation

Bazihizina, N and Veneklaas, EJ and Barrett-Lennard, EG and Colmer, TD, Hydraulic redistribution: limitations for plants in saline soils, Plant, Cell and Environment, 40, (10) pp. 2437-2446. ISSN 0140-7791 (2017) [Refereed Article]


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DOI: doi:10.1111/pce.13020

Abstract

Hydraulic redistribution (HR), the movement of water from wet to dry patches in the soil via roots, occurs in different ecosystems and plant species. By extension of the principle that HR is driven by gradients in soil water potential, HR has been proposed to occur for plants in saline soils. Despite the inherent spatial patchiness and salinity gradients in these soils, the lack of direct evidence of HR in response to osmotic gradients prompted us to ask the question: are there physical or physiological constraints to HR for plants in saline environments? We propose that build-up of ions in the root xylem sap and in the leaf apoplast, with the latter resulting in a large predawn disequilibrium of water potential in shoots compared with roots and soil, would both impede HR. We present a conceptual model that illustrates how processes in root systems in heterogeneous salinity with water potential gradients, even if equal to those in non-saline soils, will experience a dampened magnitude of water potential gradients in the soil–plant continuum, minimizing or preventing HR. Finally, we provide an outlook for understanding the relevance of HR for plants in saline environments by addressing key research questions on plant salinity tolerance

Item Details

Item Type:Refereed Article
Keywords:Halophyte, heterogeneous soil salinity, hydrauliclift, hydraulic conductivity, osmotic potential, plant waterpotential, plant predawn disequilibrium, roots, xylem, watertransfer
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Bazihizina, N (Dr Nadia Bazihizina)
ID Code:125881
Year Published:2017
Deposited By:TIA - Research Institute
Deposited On:2018-05-14
Last Modified:2018-05-14
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