4.3 Article

Diurnal photosynthetic performance of two oak species from two provenances in a Mediterranean and a central European common garden

期刊

PHOTOSYNTHETICA
卷 -, 期 -, 页码 326-336

出版社

ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.32615/ps.2022.023

关键词

assisted migration; chlorophyll fluorescence; diurnal variation; gas exchange; Quercus frainetto; Quercus pubescens

资金

  1. project IKYDA-FUTUREOAKS - program IKYDA 2018 of the Greek State Scholarships Foundation (IKY)
  2. German Society for Academic Exchanges (DAAD) [57419907]

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Research has shown that Greek and Italian provenances of Mediterranean oaks have similar diurnal photosynthetic performance under different growth regimes. These oaks exhibit high photosynthetic efficiency under the current climate in Central Europe, making them suitable for assisted migration schemes.
Oaks may contribute to the stabilization of European forests under climate change. We utilized two common gardens established in contrasting growth regimes, in Greece (Olympiada) and Germany (Schwanheim), to compare the diurnal photosynthetic performance of a Greek and an Italian provenance of two Mediterranean oaks (Quercus pubescens and Q. frainetto) during the 2019 growing season. Although the higher radiation in the southern common garden led to a strong midday depression of chlorophyll a fluorescence parameters (maximum quantum efficiency of PSII, performance index on absorption basis), comparable light-saturated net photosynthetic rates were achieved in both study areas. Moreover, both species and provenances exhibited analogous responses. Q. pubescens had enhanced chlorophyll a fluorescence traits but similar photosynthetic rates compared to Q. frainetto, whereas the provenances did not differ. These findings indicate the high photosynthetic efficiency of both oaks under the current climate in Central Europe and their suitability for assisted migration schemes.

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