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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (08): 1362-1370.doi: 10.3724/SP.J.1006.2010.01362

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Nitrogen Nutrition on Photosynthetic Functions of Wheat Leaves under Elevated Atmospheric CO2 Concentration

ZHANG Xu-Cheng1,2, ZHANG Fu-Suo2, YU Xian-Feng1, and CHEN Xin-Ping2   

  1. 1 Key Laboratory of Northwest Crop Drought-resistant Farming, Ministry of Agriculture / Gansu Academy of Agricultural Sciences, Lanzhou 730070, China; 2 College of Resources and Environment, China Agricultural University, Beijing 100193, China
  • Received:2010-01-18 Revised:2010-04-17 Online:2010-08-12 Published:2010-06-11

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Abstract: Nitrogen application rate is a critical factor led to photosynthesis acclimation of C3 plant under elevated atmospheric CO2 concentration. However, current knowledge is inadequate for the responses of photosynthetic electron transport and energy distribution of photosynthesis acclimation to nitrogen application rate in C3 plant, and the influence of photosynthesis function on photosynthetic electron transport and energy distribution. Using Top Open Chambers, the elevated concentration of atmospheric CO2 was simulated. Wheat (Triticum aestivum L.) was grown under two nitrogen application rates and two atmospheric CO2 concentrations. The photosynthetic gas exchange parameters, chlorophyll fluorescence parameters, and chlorophyll content of wheat leaves, were measured at jointing and heading stages to study the influence of nitrogen application on photosynthetic function of wheat leaves exposed to elevated atmospheric CO2 concentration. The results showed that the photosynthetic rate (Pn), stomatal conductance (Gs), and transpiration rate (Tr) decreased in low-N wheat leaves, and the photosynthetic acclimation appeared. However, in high-N wheat leaves the photosynthetic acclimation did not appear, Pn, Gs, and Tr decreased significantly whereas the leaf WUE increased significantly under elevated atmospheric CO2 concentration. The photochemical rate, photosynthetic electron rate of PSII (JF), electronic transport rate of photochemistry (JC), Rubisco carboxylase rate (VC), and triose phosphate utilization (TPU) declined significantly in low-N wheat leaves; and were not changed in high-N wheat leaves compared to those under ambient atmospheric CO2 concentration. The JC/JF, VC/JC, and V0/VC had no significant changes between treatments with different nitrogen application rate and atmospheric CO2 concentrations. This indicated that nitrogen application may increase the photosynthetic energy use, but have no significant influence on photosynthetic energy distribution. The leaf nitrogen and chlorophyll contents increased when nitrogen was applicated under both treatments of CO2 concentrations, especially, the photosynthetic nitrogen use efficiency (NUE) in high-N wheat leaves increased under elevated atmospheric CO2 concentration. It suggested that the photosynthetic energy transport rate and assimilatory ability increased by nitrogen application under elevated atmospheric CO2 concentration. Thus, the photosynthesis acclimation did not appear in high-N wheat leaves. Because there was a significant interaction between nitrogen application rate and atmospheric CO2 concentration on photosynthetic energy use in wheat leaves, and the photosynthetic NUE in high-N wheat leaves increased under elevated atmospheric CO2 concentration but decreased under normal ambient atmospheric CO2 concentration, it concluded that the nitrogen application affects photosynthesis directly in wheat leaves under elevated atmospheric CO2 concentration.

Key words: Atmospheric CO2 enrichment, Nitrogen, Photosynthetic gas exchange, Photosynthetic energy transport and districution, Wheat

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