Response of gas exchange rates in <Emphasis Type="Italic">Abies firma</Emphasis> seedlings to various additional stresses under chronic acid fog stress |
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| Authors: | Email author" target="_blank">Koji?YoshidaEmail author Ryota?Shibasaki Chika?Takami Chisato?Takenaka Kazukiyo?Yamamoto Takafumi?Tezuka |
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| Institution: | (1) Laboratory of Forest Environment and Resources, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan;(2) Japan Science and Technology Corporation (CREST), Japan;(3) School of Agricultural Sciences, Nagoya University, Nagoya, Japan;(4) Graduate School of Science, Nagoya University, Nagoya, Japan |
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| Abstract: | In order to clarify the chronic influence of acid fog on the gas exchange rates of momi fir (Abies firma Sieb. et Zucc.) trees, we exposed them to simulated acid fog (pH 3) for 3 years. The composition of the acid fog was similar to that observed in a region where momi fir trees have been declining, and it contained organic acids. We then treated the firs with various additional stresses, such as drought, low temperature, fine root cutting, ozone exposure, soil acidification, nitrogen load, and rhizosphere aluminum stress. Under chronic exposure to acid fog, the momi fir seedlings exhibited a pattern of stomatal behavior whereby they excessively opened in summer and closed in winter. Furthermore, the stomata of these seedlings tended to open during drought stress, and their needles were visibly injured after ozone exposure. The net photosynthesis rates of the seedlings exposed to acid fog were regulated by their stomatal aperture, rather than directly by acid fog. These results suggest that acid fog exposure disturbs the control of stomatal function in the momi fir seedlings. In addition, we found that chronic acid fog exposure suppressed the decrease in net photosynthesis rate, due to its nitrogen load. |
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| Keywords: | Abies firma Acid fog Complex stress Gas exchange rate Stomata |
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