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오존 환경에 대한 잡종 포플러 묘목의 가스 교환과 생장에 관한 연구

Ozone-environmental Effects on Gas Exchange and Growth of Hybrid Poplar (Populus trichocarpa $\\times$ P. deltoides) Seedlings


Hybrid poplar (Populus trichocarpa $\times$ P. deltoides) clones were fumigated with ozone. Fumigation was applied for 6 to 8 hours each day for approximately 3 months at ozone concentrations of 0.090 to 0.115 ppm using by open-top chambers. Growth and biomass of hybrid poplar seedlings were reduced by ozone exposure. Mean percentage of falling leaves in ozone-treated plant was 6 times higher than that of charcoal-filtered plant. Among physiological responses, rate of photosynthesis, stomatal conductance, transpiration and initial Rubisco activity were significantly lower in seedlings grown in ozone environment compared seedlings grown in charcoal-filtered air. All these physiological results supported that biochemical process to be a key feature to understand reduction in photosynthesis.

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