Photosynthetica

, Volume 45, Issue 1, pp 85–91

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?

  • Z.-H. Yong
  • G.-Y. Chen
  • D.-Y. Zhang
  • Y. Chen
  • J. Chen
  • J.-G. Zhu
  • D.-Q. Xu
Original Papers

DOI: 10.1007/s11099-007-0013-5

Cite this article as:
Yong, Z., Chen, G., Zhang, D. et al. Photosynthetica (2007) 45: 85. doi:10.1007/s11099-007-0013-5

Abstract

Net photosynthetic rate (PN) of leaves grown under free-air CO2 enriched condition (FACE, about 200 µmol mol−1 above ambient air) was significantly lower than PN of leaves grown at ambient CO2 concentration (AC) when measured at CO2 concentration of 580 µmol 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 PN 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 (Φc) and ribulose-1,5-bisphosphate (RuBP) content in NN-plants but not in LN-plants.

Additional key words

apparent quantum yieldcarboxylation efficiencynet photosynthetic ratenitrogen supplyOryzaribulose-1,5-bisphosphate regeneration

Abbreviations

AC

ambient CO2 concentration

C

carbon

CE

carboxylation efficiency

Ci

intercellular CO2 concentration

FACE

free-air CO2 enrichment

Jmax

maximum in vivo electron transport rate

N

nitrogen

NR

nitrate reductase

PN

net photosynthetic rate

PPFD

photosynthetic photon flux density

RuBP

ribulose-1,5-bisphosphate

Vcmax

maximum in vivo carboxylation rate

Φc

apparent quantum yield of carbon assimilation

Copyright information

© Institute of Experimental Botany, ASCR 2007

Authors and Affiliations

  • Z.-H. Yong
    • 1
  • G.-Y. Chen
    • 1
  • D.-Y. Zhang
    • 1
  • Y. Chen
    • 1
  • J. Chen
    • 1
  • J.-G. Zhu
    • 2
  • D.-Q. Xu
    • 1
  1. 1.Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological SciencesChinese Academy of Sciences, and Graduate School of the Chinese Academy of SciencesShanghaiChina
  2. 2.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil ScienceChinese Academy of SciencesNanjingChina