Singlet oxygen scavenging by leaf flavonoids contributes to sunlight acclimation in Tilia platyphyllos

Petra Majer, Susanne Neugart, Angelika Krumbein, Monika Schreiner, É. Hideg

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Both high photosynthetically active radiation (PAR) and ultraviolet radiation (UV) are capable of causing photooxidative stress, but leaves are equipped with an array of protective mechanisms making life under full sunlight possible. Comparing acclimation strategies of Tilia platyphyllos leaves we found that sun leaves were better protected against stress than shade leaves by having (i) more efficient regulated non-photochemical quenching, (ii) a higher capacity to neutralize singlet oxygen, a reactive oxygen species known to be capable of promoting oxidative damage by excess PAR and (iii) containing more UV absorbing pigments. HPLC-MSn analysis showed both quantitative and qualitative differences in higher flavonoid contents: sun leaves contained 4.2-times more flavonoids than shade leaves and the quercetin:kaempferol ratio was also higher in the former. In addition, sun leaves also contained significant amounts of myricetin, which was detectable only in traces in shade leaves. Flavonols were mainly present as rhamnosides and in vitro tests of these compounds showed that quercetin and myricetin glycosides were much better singlet oxygen antioxidants than kaempferol glycosides. Thus a shift from monohydroxylated flavonols (kaempferol derivatives) towards dihydroxylated quercetin or trihydroxylated myricetin improves the singlet oxygen targeted antioxidant potential of leaves and potentially improves protection against photoinhibition by high PAR. On the other hand, experiments with pure test compounds also showed that multihydroxylated flavonol rhamnosides do not have better UV-B absorption than monohydroxylated ones. Thus the observed difference in flavonoid composition is not expected to contribute to the observed better UV-B absorbing capacity of sun leaves. Our data suggest that responses to high intensity PAR and to solar UV-B are closely connected and that UV-inducible flavonols play a key role in the successful acclimation of sun leaves to high PAR as efficient singlet oxygen antioxidants.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalEnvironmental and Experimental Botany
Volume100
DOIs
Publication statusPublished - Apr 2014

Fingerprint

Tilia platyphyllos
singlet oxygen
acclimation
solar radiation
flavonoids
oxygen
ultraviolet radiation
photosynthetically active radiation
leaves
flavonols
ultraviolet B radiation
myricetin
kaempferol
quercetin
antioxidant
shade
antioxidants
glycosides
photoinhibition
pigment

Keywords

  • Flavonoid
  • Kaempferol
  • Quercetin
  • Singlet oxygen
  • Sunlight acclimation
  • UV

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science
  • Agronomy and Crop Science

Cite this

Singlet oxygen scavenging by leaf flavonoids contributes to sunlight acclimation in Tilia platyphyllos. / Majer, Petra; Neugart, Susanne; Krumbein, Angelika; Schreiner, Monika; Hideg, É.

In: Environmental and Experimental Botany, Vol. 100, 04.2014, p. 1-9.

Research output: Contribution to journalArticle

Majer, Petra ; Neugart, Susanne ; Krumbein, Angelika ; Schreiner, Monika ; Hideg, É. / Singlet oxygen scavenging by leaf flavonoids contributes to sunlight acclimation in Tilia platyphyllos. In: Environmental and Experimental Botany. 2014 ; Vol. 100. pp. 1-9.
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