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Plant function and evolutionary biology
REVIEW

The integration of activity in saline environments: problems and perspectives

John M. Cheeseman
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A Department of Plant Biology, University of Illinois, Urbana, IL 61801, USA. Email: j-cheese@illinois.edu

This paper originates from a presentation at the COST WG2 MeetingPutting halophytes to workgenetics, biochemistry and physiologyHannover, Germany, 2831 August 2012.

Functional Plant Biology 40(9) 759-774 https://doi.org/10.1071/FP12285
Submitted: 27 September 2012  Accepted: 20 January 2013   Published: 4 March 2013

Abstract

The successful integration of activity in saline environments requires flexibility of responses at all levels, from genes to life cycles. Because plants are complex systems, there is no ‘best’ or ‘optimal’ solution and with respect to salt, glycophytes and halophytes are only the ends of a continuum of responses and possibilities. In this review, I briefly examine seven major aspects of plant function and their responses to salinity including transporters, secondary stresses, carbon acquisition and allocation, water and transpiration, growth and development, reproduction, and cytosolic function and ‘integrity’. I conclude that new approaches are needed to move towards understanding either organismal integration or ‘salt tolerance’, especially cessation of protocols dependent on sudden, often lethal, shock treatments and the embracing of systems level resources. Some of the tools needed to understand the integration of activity and even ‘salt stress’ are already in hand, such as those for whole-transcriptome analysis. Others, ranging from discovery studies of the nature of the cytosol to expanded tool kits for proteomic, metabolomic and epigenomic studies, still need to be further developed. After resurrecting the distinction between applied stress and the resultant strain and noting that with respect to salinity, the strain is manifest in changes at all -omic levels, I conclude that it should be possible to model and quantify stress responses.

Additional keywords: cation transport, chaperones, compatible osmotica, continuum, cytosolic integrity, glycophyte, halophyte, hydrophilins, photosynthesis, salt tolerance, signalling, sodium toxicity, water relations.


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