H2O2 homeostasis in wild-type and ethylene-insensitive Never ripe tomato in response to salicylic acid treatment in normal photoperiod and in prolonged darkness

Zoltán Takács, Péter Poór, Péter Borbély, Zalán Czékus, G. Szalai, I. Tari

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Ethylene proved to be an important modulator of salicylic acid (SA) signalling pathway. Since SA may regulate both the production and scavenging of hydrogen peroxide (H2O2), which show light-dependency, the aim of this study was to compare H2O2 metabolism in the leaves of SA-treated wild-type (WT) tomato (Solanum lycopersicum L. cv. Ailsa Craig) and in ethylene receptor Never-ripe (Nr) mutants grown in normal photoperiod or in prolonged darkness. H2O2 accumulation was higher in the WT than in the mutants in normal photoperiod after 1 mM SA treatment, while Nr leaves contained more H2O2 after light deprivation. The expression of certain superoxide dismutase (SOD) genes and activity of the enzyme followed the same tendency as H2O2, which was scavenged by different enzymes in the two genotypes. Catalase (CAT, EC 1.11.1.6) activity was inhibited by SA in WT, while the mutants maintained enhanced enzyme activity in the dark. Thus, in WT, CAT inhibition was the major component of the H2O2 accumulation elicited by 1 mM SA in a normal photoperiod, since the expression and/or activity of ascorbate (APX, EC 1.11.1.11) and guaiacol peroxidases (POD, EC 1.11.1.7) were induced in the leaves. The absence of APX and POD activation in mutant plants suggests that the regulation of these enzymes by SA needs functional ethylene signalling. While the block of ethylene perception in Nr mutants was overwritten in the transcription and activity of certain SOD and CAT isoenzymes during prolonged darkness, the low APX and POD activities led to H2O2 accumulation in these tissues.

Original languageEnglish
Pages (from-to)74-85
Number of pages12
JournalPlant Physiology and Biochemistry
Volume126
DOIs
Publication statusPublished - May 1 2018

Fingerprint

Salicylic Acid
Darkness
Photoperiod
Lycopersicon esculentum
salicylic acid
ethylene
homeostasis
Homeostasis
photoperiod
tomatoes
mutants
Enzymes
Superoxide Dismutase
catalase
superoxide dismutase
peroxidase
enzyme activity
Light
leaves
Solanum lycopersicum

Keywords

  • Antioxidant enzymes
  • Ethylene signalling
  • Hydrogen-peroxide homeostasis
  • Never ripe mutant
  • Prolonged dark treatment
  • Salicylic acid
  • Tomato

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science

Cite this

H2O2 homeostasis in wild-type and ethylene-insensitive Never ripe tomato in response to salicylic acid treatment in normal photoperiod and in prolonged darkness. / Takács, Zoltán; Poór, Péter; Borbély, Péter; Czékus, Zalán; Szalai, G.; Tari, I.

In: Plant Physiology and Biochemistry, Vol. 126, 01.05.2018, p. 74-85.

Research output: Contribution to journalArticle

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AU - Takács, Zoltán

AU - Poór, Péter

AU - Borbély, Péter

AU - Czékus, Zalán

AU - Szalai, G.

AU - Tari, I.

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