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首页> 外文期刊>Photosynthetica: International Journal for Photosynthesis Research >Changes in morphology, anatomy, and photosynthetic capacity of needles of Japanese larch (Larix kaempferi) seedlings grown in high CO2 concentrations
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Changes in morphology, anatomy, and photosynthetic capacity of needles of Japanese larch (Larix kaempferi) seedlings grown in high CO2 concentrations

机译：Changes in morphology, anatomy, and photosynthetic capacity of needles of Japanese larch (Larix kaempferi) seedlings grown in high CO2 concentrations

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Photosynthetic traits of two-year-old Japanese larch seedlings (Larix kaempferi Carr.) grown at elevated CO2 concentrations were studied in relation to structural changes in the needles. Seedlings were grown at two CO2 concentrations, 360 (AC) and 720 (EC) mumol mol(-1) at high and low nutrient supply rates, high N (HN) and low N (LN). The photosynthetic capacity fell significantly in EC+LN, but increased significantly in EC+HN. Since the mesophyll surface area exposed to intercellular space per unit leaf area (A(mes)/A) is correlated with the photosynthetic rate, we measured A(mes)/A for larch needles growing in EC. Changes of A(mes)/A in both EC+HN and EC+LN were very similar to the changes in photosynthetic capacity. This suggests that the changes of A(mes)/A in EC probably caused the changes in the photosynthetic capacity. The changes of A(mes)/A in EC were attributed to changes in the mesophyll cell size and mesophyll cell number. The photosynthetic capacity in EC can be explained by taking morphological and structural adaptations into account as well as biochemical factors. [References: 35]

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