Seasonal variation of leaf ecophysiological traits within the canopy of Quercus petraea (Matt.) Liebl. trees

Erzsébet Szollosi, V. Oláh, P. Kanalas, J. Kis, A. Fenyvesi, Ilona Mészáros

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Facing contrasting light regimes during a vegetation season and depending on canopy position, physiological plasticity of leaves is vital for tree species to sustain the optimal ratio between the benefit of carbon assimilation and the costs of photoprotection in a given leaf. We tested the seasonal adjustment of sun and shade leaf photochemistry of sessile oak (Quercus petraea (Matt.) Liebl.) to changing light environments by parallel investigation of the meteorological conditions, photosynthetic pigment content, PSII quantum efficiency and excitation energy quenching. Sun and shade leaves got adapted to their prevailing light regimes till mid of May. High LMA was a favourable trait in avoiding water loss and decreasing photoinhibition in both flushing and sun leaves, while low LMA optimized the light absorbing leaf surface in the lower canopy layer. Partitioning of excitation energy dissipation pathyways that is PSII photochemistry-Y(II), regulated-Y(NPQ) and non-regulated-Y(NO) quenching changed significantly during leaf ontogeny and with the position of leaves in the canopy. At 800 μmol m-2 s-1Y(II) <Y (NO) <Y (NPQ) was characteristic to early developmental stage of leaves from both canopy layers and to mature shade leaves, and Y(NO) <Y (II) <Y (NPQ) to mature sun leaves but the magnitude of Y(NPQ) and violaxanthin cycle activity differed in different canopy positions.

Original languageEnglish
Pages (from-to)172-188
Number of pages17
JournalActa Biologica Hungarica
Volume61
Issue numberSUPPL. 1
DOIs
Publication statusPublished - Jan 1 2010

Fingerprint

Quercus
Solar System
Sun
seasonal variation
canopy
Photochemistry
Light
Excitation energy
Photochemical reactions
Quenching
Activity Cycles
Quantum efficiency
Pigments
Plasticity
Energy dissipation
photochemistry
Carbon
Costs and Cost Analysis
Water
photoprotection

Keywords

  • chlorophyll fluorescence
  • photosynthetic pigments
  • Quercus petraea
  • sun and shade leaves
  • VA Z (violaxanthin + antheraxanthin + zeaxanthin)

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Environmental Science(all)
  • Neurology

Cite this

Seasonal variation of leaf ecophysiological traits within the canopy of Quercus petraea (Matt.) Liebl. trees. / Szollosi, Erzsébet; Oláh, V.; Kanalas, P.; Kis, J.; Fenyvesi, A.; Mészáros, Ilona.

In: Acta Biologica Hungarica, Vol. 61, No. SUPPL. 1, 01.01.2010, p. 172-188.

Research output: Contribution to journalArticle

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