Seasonal Variation of Leaf Ecophysiological Traits within the Canopy of Quercus petraea (Matt.) Liebl. trees

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.

Abbreviations

CHL:

chlorophyll

CAR:

carotenoids, Fm, maximum fluorescence in the dark adapted state

Fo:

minimum fluorescence in the dark adapted state

Fm:

maximum fluorescence in the light adapted state

LMA:

leaf mass per area

PPFD:

Photosynthetic Photon Flux Density in μmol quanta m−2 s−1

Y(II):

quantum yield of photochemistry in PS II

Y(NO):

quantum yield of non-regulated non-photochemical quenching in PS II

Y(NPQ):

quantum yield of regulated non-photochemical quenching in PS II

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Correspondence to Ilona Mészáros.

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Szőllősi, E., Oláh, V., Kanalas, P. et al. Seasonal Variation of Leaf Ecophysiological Traits within the Canopy of Quercus petraea (Matt.) Liebl. trees. BIOLOGIA FUTURA 61, 172–188 (2010). https://doi.org/10.1556/ABiol.61.2010.Suppl.17

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Keywords

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