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Version 3.18
Publication Type J
Authors Gil, R., M. Boscaiu, C. Lull, I. Bautista, A. Lidon and O. Vicente
Title Are soluble carbohydrates ecologically relevant for salt tolerance in halophytes?
Source Functional Plant Biology
Author Keywords abiotic stress biochemical diversity carbohydrate metabolism osmotic adjustment salt stress salinity stress coarctata roxb. tateoka transgenic tobacco compatible solutes salinity tolerance drought tolerance abiotic stress organic osmolytes water relations trehalose metabolism chemical-composition
Abstract A general response of plants to high soil salinity relies on the cellular accumulation of osmolytes, which help the plant tomaintain osmotic balance under salt stress condition and/or act as 'osmoprotectants' with chaperon or reactive oxygen species (ROS) scavenging activities. Yet the ecological relevance of this response for the salt tolerance mechanisms of halophytes in their natural habitats remains largely unknown. In this review, we describe and discuss published data supporting the participation of compatible solutes in those mechanisms, with especial focus on soluble carbohydrates. Evidence for a functional role of carbohydrates in salt tolerance include: (i) relatively high levels of specific sugars and polyols have been detected inmany halophytic taxa; (ii) an increase in salt tolerance has often been observed in parallel with increased intracellular levels of particular soluble carbohydrates, in transgenic plants overexpressing the corresponding biosynthetic enzymes; (iii) there are several examples of genes involved in carbohydrate metabolism which are induced under salt stress conditions; (iv) specific sugars or polyols have been shown to accumulate in different halophytes upon controlled salt treatments; and (v) although very few field studies on environmentally induced carbohydrate changes in halophytes exist, in general they also support the involvement of this type of osmolytes in salt stress tolerance mechanisms. We also highlight the complexities of unequivocally attributing carbohydrates a biological role in salt tolerance mechanisms of a given tolerant species. It is proposed that research on halophytes in their natural ecosystems should be intensified, correlating seasonal changes in carbohydrate contents with the degree of environmental stress affecting the plants. This could be an important complement to experiments made under more controlled (but artificial) conditions, such as laboratory set-ups.
Author Address [Gil, Ricardo; Vicente, Oscar] Univ Politecn Valencia, Inst Biol Mol & Celular Plantas UPV CSIC, Valencia, Spain. [Boscaiu, Monica] Univ Politecn Valencia, Inst Agroforestal Mediterraneo UPV, Valencia, Spain. [Lull, Cristina; Bautista, Inmaculada; Lidon, Antonio] Univ Politecn Valencia, ReForest Dept Ingn Hidraul & Medio Ambiente, Valencia, Spain. Vicente, O (reprint author), Univ Politecn Valencia, Inst Biol Mol & Celular Plantas UPV CSIC, Valencia, Spain. ovicente@ibmcp.upv.es
ISSN 1445-4408
ISBN 1445-4408
29-Character Source Abbreviation Funct. Plant Biol.
Year Published 2013
Volume 40
Issue 8-9
Beginning Page 805-818
Digital Object Identifier (DOI) 10.1071/fp12359
Unique Article Identifier WOS:000322672000005
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