Effects of seasonal change and experimental warming on the temperature dependence of photosynthesis in the canopy leaves of Quercus serrata

Daisuke P. Yamaguchi, Tatsuro Nakaji, Tsutom Hiura, Kouki Hikosaka

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    The effects of warming on the temperature response of leaf photosynthesis have become an area of major concern in recent decades. Although growth temperature (GT) and day length (DL) affect leaf gas exchange characteristics, the way in which these factors influence the temperature dependence of photosynthesis remains uncertain. We established open-Top canopy chambers at the canopy top of a deciduous forest, in which average daytime leaf temperature was increased by 1.0-°C. We conducted gas exchange measurements for the canopy leaves of deciduous trees exposed to artificial warming during different seasons. The carbon dioxide assimilation rate at 20-°C (A20) was not affected by warming, whereas that at °C (A25) tended to be higher in leaves exposed to warming. Warming increased the optimal temperature of photosynthesis by increasing the activation energy for the maximum rate of carboxylation. Regression analysis indicated that both GT and DL strongly influenced gas exchange characteristics. Sensitivity analysis revealed that DL affected A without obvious effects on the temperature dependence of A, whereas GT almost maintained constant A20 and strongly influenced the temperature dependence. These results indicate that GT and DL have different influences on photosynthesis; GT and DL affect the 'slope' and intercept' of the temperature dependence of photosynthesis, respectively.

    Original languageEnglish
    Pages (from-to)1283-1295
    Number of pages13
    JournalTree Physiology
    Volume36
    Issue number10
    DOIs
    Publication statusPublished - 2016 Oct 1

    Keywords

    • Vcmax
    • activation energy
    • day length
    • optimal temperature of photosynthesis
    • simulation
    • temperature acclimation

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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