Effects of high CO2 levels on dynamic photosynthesis: carbon gain, mechanisms, and environmental interactions

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• 作者：Hajime Tomimatsu ; Yanhong Tang
• 刊名：Journal of Plant Research
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：129
• 期：3
• 页码：365-377
• 全文大小：3,154 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Plant Ecology
  Plant Physiology
  Plant Biochemistry
  
• 出版者：Springer Japan
• ISSN：1618-0860
• 卷排序：129

文摘

Understanding the photosynthetic responses of terrestrial plants to environments with high levels of CO₂ is essential to address the ecological effects of elevated atmospheric CO₂. Most photosynthetic models used for global carbon issues are based on steady-state photosynthesis, whereby photosynthesis is measured under constant environmental conditions; however, terrestrial plant photosynthesis under natural conditions is highly dynamic, and photosynthetic rates change in response to rapid changes in environmental factors. To predict future contributions of photosynthesis to the global carbon cycle, it is necessary to understand the dynamic nature of photosynthesis in relation to high CO₂ levels. In this review, we summarize the current body of knowledge on the photosynthetic response to changes in light intensity under experimentally elevated CO₂ conditions. We found that short-term exposure to high CO₂ enhances photosynthetic rate, reduces photosynthetic induction time, and reduces post-illumination CO₂ burst, resulting in increased leaf carbon gain during dynamic photosynthesis. However, long-term exposure to high CO₂ during plant growth has varying effects on dynamic photosynthesis. High levels of CO₂ increase the carbon gain in photosynthetic induction in some species, but have no significant effects in other species. Some studies have shown that high CO₂ levels reduce the biochemical limitation on RuBP regeneration and Rubisco activation during photosynthetic induction, whereas the effects of high levels of CO₂ on stomatal conductance differ among species. Few studies have examined the influence of environmental factors on effects of high levels of CO₂ on dynamic photosynthesis. We identified several knowledge gaps that should be addressed to aid future predictions of photosynthesis in high-CO₂ environments.KeywordsCarbon dioxideDynamic photosynthesisElevated CO₂Fluctuating irradianceLightfleckSunfleck