Plant Growth Regulation

, Volume 76, Issue 1, pp 25–40 | Cite as

Salicylic acid in plant salinity stress signalling and tolerance

  • Maheswari Jayakannan
  • Jayakumar Bose
  • Olga Babourina
  • Zed Rengel
  • Sergey Shabala
Original paper

Abstract

Soil salinity is one of the major environmental stresses affecting crop production worldwide, costing over $27Bln per year in lost opportunities to agricultural sector and making improved salinity tolerance of crops a critical step for sustainable food production. Salicylic acid (SA) is a signalling molecule known to participate in defence responses against variety of environmental stresses including salinity. However, the specific knowledge on how SA signalling propagates and promotes salt tolerance in plants remains largely unknown. This review focuses on the role of SA in regulation of ion transport processes during salt stress. In doing this, we briefly summarise a current knowledge on SA biosynthesis and metabolism, and then discuss molecular and physiological mechanisms mediating SA intracellular and long distance transport. We then discuss mechanisms of SA sensing and interaction with other plant hormones and signalling molecules such as ROS, and how this signalling affects activity of sodium and potassium transporters during salt stress. We argue that NPR1-mediated SA signalling is pivotal for (1) controlling Na+ entry into roots and the subsequent long-distance transport into shoots, (2) enhancing H+-ATPase activity in roots, (3) preventing stress-induced K+ leakage from roots via depolarisation-activated potassium outward-rectifying channel (KOR) and ROS-activated non-selective cation channels, and (4) increasing K+ concentration in shoots during salt stress. Future work should focus on how SA can regulate Na+ exclusion and sequestration mechanisms in plants.

Keywords

Sodium Potassium Reactive oxygen species Intracellular ionic homeostasis Stomatal regulation H+-ATPase Membrane transporters Voltage gating 

Abbreviations

ABA

Abscisic acid

aba3-1

ABA biosynthesis mutant3-1

acd

Accelerated cell death

agd2

Aberrant growth and death2

AHG2

Encoding poly (A)-specific ribonuclease

BA2H

Benzoic-acid-2-hydroxylase

cpr

Constitutive expresser of PR (pathogenesis related protein)

dnd

Defence no death

eds

Enhanced disease susceptibility 5

GLR

Glutamate receptor channels

GORK

Guard cells Outward-Rectifying depolarisation-activated K+ channel

HKT

High-affinity K+ transporter

ICS

Isochorismate synthase

IPL

Isochorismate pyruvate lyase

isd1

Lesions simulating disease1

MeSAG

Methyl salicylic acid O-β-glucose

MeSA

Methyl salicylate

NahG

Naphthalene hydroxylase G

NPR1

Non-expresser of pathogenesis related protein 1

NSCC

Non-selective cation channels

nudt7

Nudix hydrolase7

PAL

Phenylalanine ammonia-lyase

SABP2

SA-binding protein 2

SAG

Salicylic acid O-β-glucoside

SAGT

SA glycosyltransferase

SAR

Systemic acquired resistance

SA

Salicylic acid

SGE

Salicyloyl glucose ester

sid2

SA-induction-deficient

siz1

Small ubiquitin-like modifier E3 ligase1

snc1

Suppressor of npr1-1 consitutive1

SOS1

Salt overly sensitive1

SUMO

Small ubiquitin-related modifier

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Maheswari Jayakannan
    • 1
    • 2
    • 3
  • Jayakumar Bose
    • 2
  • Olga Babourina
    • 1
  • Zed Rengel
    • 1
  • Sergey Shabala
    • 2
  1. 1.School of Earth and EnvironmentUniversity of Western AustraliaPerthAustralia
  2. 2.School of Land and Food and Tasmanian Institute for AgricultureUniversity of TasmaniaHobartAustralia
  3. 3.School of Biological ScienceUniversity of TasmaniaHobartAustralia

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