Leaf gas exchange and fluorescence of Phillyrea latifolia, Pistacia lentiscus and Quercus ilex saplings in severe drought and high temperature conditions

I. Filella, J. Llusià, J. Piñol, J. Peñuelas

    Research output: Contribution to journalArticleResearchpeer-review

    100 Citations (Scopus)

    Abstract

    Saplings of Phillyrea latifolia, Pistacia lentiscus and Quercus ilex were witheld watering for 7 days, followed by reirrigation. Incident photosynthetic photon flux density (PPFD), leaf temperature, net photosynthetic rates, stomatal conductance, and photochemical efficiency of the photosystem II (ΔF/F'm) were measured three times during the day. The watered plants had higher photosynthetic rates, stomatal conductances, ΔF/F'm and ETR than non-watered plants. However, watered plants were mildly water stressed as shown by low ratio of variable to maximal fluorescence (Fv/Fm) and high non-photochemical fluorescence quenching (qN). Their ΔF/F'm was low in the morning and increased in the evening, following the variations in PPFD. Watered plants of Q. ilex had lower photosynthetic activity, stomatal conductance and photosynthetic radiation use efficiency than Ph. latifolia and P. lentiscus, and, conversely, reached the highest ΔF/F'm and ETR. This seems to indicate a different relationship between photosynthetic activity and electron transport rate in Q. ilex compared to the other two species. Ph. latifolia and P. lentiscus appeared to be better adapted to severe drought than Q. ilex.
    Original languageEnglish
    Pages (from-to)213-220
    JournalEnvironmental and Experimental Botany
    Volume39
    Issue number3
    DOIs
    Publication statusPublished - 1 Jun 1998

    Keywords

    • ΔF/F'm
    • Drought
    • Phillyrea latifolia
    • Photosynthetic rate
    • Pistacia lentiscus
    • Quercus ilex
    • Stomatal conductance

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