Short-term effects of high CO2 accelerate photosynthetic induction in Populus koreana × trichocarpa with always-open stomata regardless of phenotypic changes in high CO2 growth conditions

Hajime Tomimatsu, Tsuyoshi Sakata, Hiroshi Fukayama, Yanhong Tang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Long-term high CO2 exposure accelerates photosynthetic induction response due to rapid light increase. However, it is unclear whether the acceleration is caused by acclimation of photosynthetic components (long-term CO2 effect) and/or by the sufficient substrate under high CO2 at the measurement (short-term CO2 effect). Populus koreana × trichocarpa cv. Peace has wide-open stomata almost not responding to changes of photon flux density. Using this species, we examined the long- and short-term CO2 effects on photosynthetic induction by focusing on biochemical components. We grew the plants under [CO2] of 380, 700 and 1020 μmol CO2 mol−1 air and measured the photosynthetic induction response under [CO2] of 380 and 1020 μmol CO2 mol1 air. Despite significant reduction in Rubisco content and light-saturated photosynthetic rate in the leaves from the high growth CO2, the photosynthetic induction time was similar in leaves from different growth CO2 plants when measurement [CO2] was the same. The induction, however, was significantly fast at the higher than at the lower measurement [CO2], regardless of growth CO2 of the plants. These results demonstrate that the acceleration of apparent photosynthetic induction under high CO2 environment was mainly contributed by a short-term CO2 effect rather than by a long-term acclimation effect when stomatal limitation is not the major factor.

Original languageEnglish
Pages (from-to)474-483
Number of pages10
JournalTree Physiology
Volume39
Issue number3
DOIs
Publication statusPublished - 2019 Mar 1
Externally publishedYes

Keywords

  • Acclimation
  • Dynamic photosynthesis
  • Fluctuating light
  • High CO
  • Photosynthetic induction
  • Populus
  • RuBP
  • Rubisco activase
  • Stomata

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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