The rate-limiting step for CO2 assimilation at different temperatures is influenced by the leaf nitrogen content in several C3 crop species

Wataru Yamori, Takeshi Nagai, Amane Makino

    Research output: Contribution to journalArticlepeer-review

    127 Citations (Scopus)

    Abstract

    Effects of nitrogen (N) supply on the limiting step of CO2 assimilation rate (A) at 380μmolmol-1 CO2 concentration (A380) at several leaf temperatures were studied in several crops, since N nutrition alters N allocation between photosynthetic components. Contents of leaf N, ribulose 1·5-bisphosphate carboxylase/oxygenase (Rubisco) and cytochrome f (cyt f) increased with increasing N supply, but the cyt f/Rubisco ratio decreased. Large leaf N content was linked to a high stomatal (gs) and mesophyll conductance (gm), but resulted in a lower intercellular (Ci) and chloroplast CO2 concentration (Cc) because the increase in gs and gm was insufficient to compensate for change in A380. The A-Cc response was used to estimate the maximum rate of RuBP carboxylation (Vcmax) and chloroplast electron transport (Jmax). The Jmax/Vcmax ratio decreased with reductions in leaf N content, which was consistent with the results of the cyt f/Rubisco ratio. Analysis using the C3 photosynthesis model indicated that A380 tended to be limited by RuBP carboxylation in plants grown at low N concentration, whereas it was limited by RuBP regeneration in plants grown at high N concentration. We conclude that the limiting step of A380 depends on leaf N content and is mainly determined by N partitioning between Rubisco and electron transport components.

    Original languageEnglish
    Pages (from-to)764-777
    Number of pages14
    JournalPlant, Cell and Environment
    Volume34
    Issue number5
    DOIs
    Publication statusPublished - 2011 May

    Keywords

    • J
    • Limiting step
    • Mesophyll conductance (g)
    • Nitrogen
    • Photosynthesis
    • RuBP carboxylation
    • RuBP regeneration
    • Stomatal conductance (g)
    • V

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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