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Title: Effective use of high CO₂ efflux at the soil surface in a tropical understory plant.
Authors: Ishida, Atsushi  kyouindb  KAKEN_id
Nakano, Takashi
Adachi, Minaco
Yoshimura, Kenichi
Osada, Noriyuki
Ladpala, Phanumard
Diloksumpun, Sapit
Puangchit, Ladawan
Yoshimura, Jin
Author's alias: 石田, 厚
Keywords: Ecophysiology
C3 photosynthesis
Issue Date: 11-Mar-2015
Publisher: Nature Publishing Group
Journal title: Scientific reports
Volume: 5
Thesis number: 8991
Abstract: Many terrestrial plants are C3 plants that evolved in the Mesozoic Era when atmospheric CO2 concentrations ([CO2]) were high. Given current conditions, C3 plants can no longer benefit from high ambient [CO2]. Kaempferia marginata Carey is a unique understory ginger plant in the tropical dry forests of Thailand. The plant has two large flat leaves that spread on the soil surface. We found a large difference in [CO2] between the partly closed space between the soil surface and the leaves (638 µmol mol(-1)) and the atmosphere at 20 cm above ground level (412 µmol mol(-1)). This finding indicates that the plants capture CO2 efflux from the soil. Almost all of the stomata are located on the abaxial leaf surface. When ambient air [CO2] was experimentally increased from 400 to 600 μmol mol(-1), net photosynthetic rates increased by 45 to 48% under near light-saturated conditions. No significant increase was observed under low light conditions. These data demonstrate that the unique leaf structure enhances carbon gain by trapping soil CO2 efflux at stomatal sites under relatively high light conditions, suggesting that ambient air [CO2] can serve as an important selective agent for terrestrial C3 plants.
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
URI: http://hdl.handle.net/2433/198826
DOI(Published Version): 10.1038/srep08991
PubMed ID: 25758763
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