Redox changes during cold acclimation affect freezing tolerance but not the vegetative/reproductive transition of the shoot apex in wheat

A. Soltész, I. Tímár, I. Vashegyi, B. Tóth, T. Kellos, G. Szalai, A. Vágújfalvi, G. Kocsy, G. Galiba

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Cold acclimation is necessary for winter wheat (Triticum aestivum L.) to achieve its genetically determined maximum freezing tolerance, and cold also fulfils the vernalisation requirement. Chromosome 5A is a major regulator of these traits. The aim of the present study was to discover whether changes in the half-cell redox potential of the glutathione/glutathione disulphide (GSH/GSSG) and ascorbate/dehydroascorbate (AA/DHA) couples induced by cold acclimation are related to freezing tolerance and vernalisation requirement in a specific genetic system including chromosome 5A substitution lines. The amounts of H 2O 2 and AA, and the AA/DHA ratio showed a rapid and transient increase in the crown of all genotypes during the first week of acclimation, followed by a gradual increase during the subsequent 2weeks. The amount of GSH and its ratio compared to GSSG quickly decreased during the first day, while later these parameters showed a continuous slow increase. The H 2O 2, AA and GSH concentrations, AA/DHA and GSH/GSSG ratios and the half-cell reduction potential of the GSH/GSSG couple were correlated with the level of freezing tolerance after 22days at 2°C; hence these parameters may have an important role in the acclimation process. In contrast to H 2O 2 and the non-enzymatic antioxidants, the lipid peroxide concentration and activity of the four antioxidant enzymes exhibited a transient increase during the first week, with no significant difference between genotypes. None of the parameters studied showed any relationship with the vegetative/generative transition state monitored as apex morphology and vernalisation gene expression.

Original languageEnglish
Pages (from-to)757-766
Number of pages10
JournalPlant Biology
Volume13
Issue number5
DOIs
Publication statusPublished - Sep 2011

Fingerprint

vernalization
cold tolerance
acclimation
freezing
shoot
tolerance
wheat
shoots
antioxidant
glutathione
chromosome
genotype
antioxidants
substitution lines
redox potential
peroxides
sulfides
tree crown
gene expression
winter wheat

Keywords

  • Antioxidants
  • Cold acclimation
  • Freezing tolerance
  • Redox changes
  • Triticum

ASJC Scopus subject areas

  • Plant Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

Redox changes during cold acclimation affect freezing tolerance but not the vegetative/reproductive transition of the shoot apex in wheat. / Soltész, A.; Tímár, I.; Vashegyi, I.; Tóth, B.; Kellos, T.; Szalai, G.; Vágújfalvi, A.; Kocsy, G.; Galiba, G.

In: Plant Biology, Vol. 13, No. 5, 09.2011, p. 757-766.

Research output: Contribution to journalArticle

Soltész, A. ; Tímár, I. ; Vashegyi, I. ; Tóth, B. ; Kellos, T. ; Szalai, G. ; Vágújfalvi, A. ; Kocsy, G. ; Galiba, G. / Redox changes during cold acclimation affect freezing tolerance but not the vegetative/reproductive transition of the shoot apex in wheat. In: Plant Biology. 2011 ; Vol. 13, No. 5. pp. 757-766.
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AU - Tóth, B.

AU - Kellos, T.

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