Seasonal changes in the temperature response of photosynthesis in canopy leaves of Quercus crispula in a cool-temperate forest

Kouki Hikosaka, Eri Nabeshima, Tsutom Hiura

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Understanding seasonal changes in photosynthetic characteristics of canopy leaves is indispensable for modeling the carbon balance in forests. We studied seasonal changes in gas exchange characteristics that are related to the temperature dependence of photosynthesis in canopy leaves of Quercus crispula Blume, one of the most abundant species in cool-temperate forests in Japan. Photosynthetic rate and ribulose-1,5-bisphosphate (RuBP) carboxylation capacity (Vcmax) at 20°C increased from June to August and then decreased in September. The activation energy of Vcmax, a measure of the temperature dependence of Vcmax, was highest in summer, indicating that Vcmax was most sensitive to leaf temperature at this time. The activation energy of Vcmax was significantly correlated with growth temperature. Other parameters related to the temperature dependence of photosynthesis, such as intercellular CO2 partial pressure and temperature dependence of RuBP regeneration capacity, showed no clear seasonal trend. It was suggested that leaf senescence affected the balance between carboxylation and regeneration of RuBP. The model simulation showed that photosynthetic rate and its optimal temperature were highest in summer.

Original languageEnglish
Pages (from-to)1035-1041
Number of pages7
JournalTree Physiology
Volume27
Issue number7
DOIs
Publication statusPublished - 2007 Jul

Keywords

  • Activation energy
  • J
  • Temperature acclimation
  • Temperature dependence of photosynthesis
  • V

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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