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The jasmonate pathway mediates salt tolerance in grapevines

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Peer-reviewed

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Article

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Authors

Riemann, Michael 
Nick, Peter 

Abstract

Salt stress is a major constraint for many crop plants, such as the moderately salt-sensitive economically important fruit crop grapevine. Plants have evolved different strategies for protection against salinity and drought. Jasmonate signalling is a central element of both biotic and abiotic stress responses. To discriminate stress quality, there must be cross-talk with parallel signal chains. Using two grapevine cell lines differing in salt tolerance, the response of jasmonate ZIM/tify-domain (JAZ/TIFY) proteins (negative regulators of jasmonate signalling), a marker for salt adaptation Na+/H+ EXCHANGER (NHX1), and markers for biotic defence STILBENE SYNTHASE (StSy) and RESVERATROL SYNTHASE (RS) were analysed. It is shown that salt stress signalling shares several events with biotic defence including activity of a gadolinium-sensitive calcium influx channel (monitored by apoplastic alkalinization) and transient induction of JAZ/TIFY transcripts. Exogenous jasmonate can rescue growth in the salt-sensitive cell line. Suppression of jasmonate signalling by phenidone or aspirin blocks the induction of JAZ/TIFY transcripts. The rapid induction of RS and StSy characteristic for biotic defence in grapevine is strongly delayed in response to salt stress. In the salt-tolerant line, NHX1 is induced and the formation of reactive oxygen species, monitored as stress markers in the sensitive cell line, is suppressed. The data are discussed in terms of a model where salt stress signalling acts as a default pathway whose readout is modulated by a parallel signal chain triggered by biotic factors downstream of jasmonate signalling.

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Keywords

Amino Acid Sequence, Aspirin, Base Sequence, Calcium, Cyclopentanes, Droughts, Gadolinium, Gene Expression Regulation, Plant, Hydrogen-Ion Concentration, Models, Biological, Molecular Sequence Data, Oxylipins, Phylogeny, Plant Growth Regulators, Plant Leaves, Plant Proteins, Plants, Genetically Modified, Pyrazoles, Reactive Oxygen Species, Salt Tolerance, Sequence Analysis, DNA, Signal Transduction, Sodium Chloride, Stress, Physiological, Vitis

Journal Title

Journal of Experimental Botany

Conference Name

Journal ISSN

0022-0957
1460-2431

Volume Title

63

Publisher

Oxford University Press (OUP)