Is photosynthetic acclimation to free-air CO₂ enrichment (FACE) related to a strong competition for the assimilatory power between carbon assimilation and nitrogen assimilation in rice leaf?

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• 作者：Z.-H. Yong ; G.-Y. Chen ; D.-Y. Zhang ; Y. Chen ; J. Chen ; J.-G. Zhu and D.-Q. Xu
• 关键词：Additional key words apparent quantum yield ; carboxylation efficiency ; net photosynthetic rate ; nitrogen supply ; Oryza ; ribulose ; 1 ; 5 ; bisphosphate regeneration
• 刊名：Photosynthetica
• 出版时间：March, 2007
• 出版年：2007
• 期刊代码：17_03003604
• 类别：env
• 卷：45
• 期：1
• 页码：85-91
• 数据来源：sp

摘要

Net photosynthetic rate (P _N) of leaves grown under free-air CO₂ enriched condition (FACE, about 200 碌mol mol−1 above ambient air) was significantly lower than P _N of leaves grown at ambient CO₂ concentration (AC) when measured at CO₂ concentration of 580 碌mol mol−1. This difference was found in rice plants grown at normal nitrogen supply (25 g m−2; NN-plants) but not in plants grown at low nitrogen supply (15 g m−2; LN-plants). Namely, photosynthetic acclimation to FACE was observed in NN-plants but not in LN-plants. Different from the above results measured in a period of continuous sunny days, such photosynthetic acclimation occurred in NN-plants, however, it was also observed in LN-plants when P _N was measured before noon of the first sunny day after rain. Hence strong competition for the assimilatory power between nitrogen (N) and carbon (C) assimilations induced by an excessive N supply may lead to the photosynthetic acclimation to FACE in NN-plants. The hypothesis is supported by the following facts: FACE induced significant decrease in both apparent photosynthetic quantum yield (Φ_c) and ribulose-1,5-bisphosphate (RuBP) content in NN-plants but not in LN-plants.