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《Acta Ecologica Sinica》 2003-01
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Comparison of photosynthetic parameters in leaves of Citrus grandis grown under different forms of nitrogen source during photosynthetic acclimation to elevated CO_2

SUN Gu-Chou, ZENG Xiao-Ping, ZHAO Ping, PENG Shao-Lin (South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China).  
Photosynthetic parameters were investigated in plants of Citrus grandis (L.) Osbeck grown under different forms of nitrogen source during photosynthetic acclimation to elevated CO 2. The experimental plants were grown in artificial soils and watered with solutions containing 2 mmol L -1 N of NO- 3-N, NH 4-N and NH 4NO 3-N respectively. Plants treated with elevated CO 2 were grown in a transparent open-top chamber with 74.4 Pa CO 2, while the controls were grown under ambient CO 2 conditions. Photosynthetic rates in leaves were measured with CI-301(CID, Inc) portable CO 2 exchange system. The results showed that higher light-saturated photosynthetic rate (Pn) was found in the NO- 3-N-plants exposed to doubled CO 2 partial pressure, compared with those under the ambient condition, indicating that Pn in the NO- 3-N-plants was promoted by elevated CO 2. However, similar Pn was found in the NH+ 4-N-plants and NH 4NO 3-N-plants under both elevated CO 2 and ambient CO 2 conditions, showing a photosynthetic acclimation to doubled CO 2 partial pressure. Doubled CO 2 partial pressure did not cause any significant change in Γ*, but slightly increased Rd (P0.05). Higher V cmax and J max were also observed in the NO- 3-N-plants exposed to doubled CO 2 partial pressure, but not in the NH+ 4-N - and the NH 4NO 3-N-plants under same conditions. Regardless of the form of nitrogen supply, elevated CO 2 did not cause any changes in leaf dry mass per area and leaf chlorophyll content, expect the content of leaf nitrogen. The partitioning coefficients of leaf nitrogen in Rubisco (P R) and in Bioenergetics (P B), or the fraction of leaf nitrogen in thylakoid light-harvesting components (P L) were not altered by different forms of nitrogen sources. It is suggested that photosynthetic acclimation to elevated CO 2 would be affected by the use of different nitrogen sources and may relate to leaf nitrogen allocation among the functional components of photosynthesis.
【Fund】: 国家自然科学基金资助项目 ( 30 2 70 2 39);; 广东省自然科学基金团队资助项目 ( 0 0 30 31 );; 中国科学院知识创新工程领域前沿资助项目;; 中国科学院华南植物研究所所长基金资助项目~~
【CateGory Index】: S666.3
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