Comparison of changes in water status and photosynthetic parameters in wild type and abscisic acid-deficient sitiens mutant of tomato (Solanum lycopersicum cv. Rheinlands Ruhm) exposed to sublethal and lethal salt stress

Péter Poór, Péter Borbély, Zalán Czékus, Zoltán Takács, Attila Ördög, Boris Popović, I. Tari

Research output: Contribution to journalArticle

Abstract

Abscisic acid (ABA) regulates many salt stress-related processes of plants such as water balance, osmotic stress tolerance and photosynthesis. In this study we investigated the responses of wild type (WT) and the ABA-deficient sitiens mutant of tomato (Solanum lycopersicum cv. Rheinlands Ruhm) to sublethal and lethal salt stress elicited by 100 mM and 250 mM NaCl, respectively. Sitiens mutants displayed much higher decrease in water potential, stomatal conductance and net CO2 assimilation rate under high salinity, especially at lethal salt stress, than the WT. However, ABA deficiency in sitiens caused more severe osmotic stress and more moderate ionic stress, higher K+/Na+ ratio, in leaf tissues of plants exposed to salt stress. The higher salt concentration caused irreversible damage to Photosystem II (PSII) reaction centres, severe reduction in the linear photosynthetic electron transport rate and in the effective quantum yields of PSII and PSI in sitiens plants. The cyclic electron transport (CET) around PSI, which is an effective defence mechanism against the damage caused by photoinhibition in PSI, decreased in sitiens mutants, while WT plants were able to increase CET under salt stress. This suggests that the activation of CET needs active ABA synthesis and/or signalling. In spite of ABA deficiency, proline accumulation could alleviate the stress injury at sublethal salt stress in the mutants but its accumulation was not sufficient at lethal salt stress.

Original languageEnglish
Pages (from-to)130-140
Number of pages11
JournalJournal of Plant Physiology
Volume232
DOIs
Publication statusPublished - Jan 1 2019

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Abscisic Acid
Solanum lycopersicum
Lycopersicon esculentum
salt stress
abscisic acid
Salts
tomatoes
mutants
Water
electron transfer
Electron Transport
water
Photosystem II Protein Complex
osmotic stress
Osmotic Pressure
photosystem II
photoinhibition
Plant Leaves
salt concentration
defense mechanisms

Keywords

  • Abscisic acid-specific changes in photosynthesis
  • Cyclic electron flow
  • Ionic stress
  • Proline
  • Salt stress
  • Sitiens mutant

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

Cite this

Comparison of changes in water status and photosynthetic parameters in wild type and abscisic acid-deficient sitiens mutant of tomato (Solanum lycopersicum cv. Rheinlands Ruhm) exposed to sublethal and lethal salt stress. / Poór, Péter; Borbély, Péter; Czékus, Zalán; Takács, Zoltán; Ördög, Attila; Popović, Boris; Tari, I.

In: Journal of Plant Physiology, Vol. 232, 01.01.2019, p. 130-140.

Research output: Contribution to journalArticle

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AU - Borbély, Péter

AU - Czékus, Zalán

AU - Takács, Zoltán

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AU - Popović, Boris

AU - Tari, I.

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