Photosynthesis and Plant Growth at Elevated Levels of CO_2

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概要

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• In this review, we discuss the effects of elevated CO_2 levels on photosynthesis in relation to the whole plant growth in terrestrial higher C_3 plants. Short-term CO_2 enrichment stimulates the rate of phtosynthesis. Plant mass is also enhanced by CO_2 enrichment. However, the effects of long-term CO_2 enrichment on photosynthesis are variable. Generally, the prolonged exposure to CO_2 enrichment reduces the initial stimulation of photosynthesis in many spesies, and frequently suppresses photosynthesis. These responses are attributed to secondary responses related to either excess carbohydrate accumulation or decreased N content rather than direct responses to CO_2. Accumulation of carbohydrates in leaves may lead to the repression of photosynthetic gene expression and excess starch seems to hinder CO_2 diffusion. Therefore, the species which have the sink organs for carbohydrate accumulation do not show the suppression of photosynthesis. The supression of photosynthesis by CO_2 enrichment is always associated with decreases in leaf N and Rubisco contents. These decreases are not due to dilution of N caused by a relative increase in the plant mass but are the result of a decrease in N allocastion to leaves at the level of the whole plant, and the decrease in Rubisco content is not selective. Leaf senescence and plant development are also accelerated by CO_2 enrichment. However, they are independent of each other in some secies. Thus, various responses to CO_2 observed at the level of a single leaf result from manifold responses at the level of the whole plant grown under conditions of CO_2 enrichment.

• 日本植物生理学会の論文

著者

• Mae Tadahiko

  Department of Agricultural Chemistry, Tohoku University

• Mae Tadahiko

  Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University

• Mae Tadahiko

  Department Of Applied Plant Science Graduate School Of Agricultural Sciences Tohoku University

• MAKINO Amane

  Department of Applied Biological Chemistry, Faculty of Agriculture, Tohoku University

• Makino Amane

  Department Of Applied Plant Science Graduate School Of Agricultural Sciences Tohoku University

• Mae Tadahiko

  Department Of Agricultural Chemistry Faculty Of Agriculture

• MAKINO Amane

  Department of Agriculture, Graduate School of Agricultural Science, Tohoku University:CREST, JST

• MAKINO Amane

  Department of Agriculture, Graduate School of Agricultural Science, Tohoku University

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