Increase in leaf mass per area benefits plant growth at elevated CO 2 concentration

Shinjiro Ishizaki, Kouki Hikosaka, Tadaki Hirose

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30 Citations (Scopus)


An increase in leaf mass per area (MLA) of plants grown at elevated [CO2] is often accompanied by accumulation of non-structural carbohydrates, and has been considered to be a response resulting from source-sink imbalance. We hypothesized that the increase in MLA benefits plants by increasing the net assimilation rate through maintaining a high leaf nitrogen content per area (NLA). To test this hypothesis, Polygonum cuspidatum was grown at ambient (370 μmol mol-1) and elevated (700 μmol mol-1) [CO2] with three levels of N supply. Elevated [CO2] significantly increased MLA with smaller effects on NLA and leaf mass ratio (fLM). The effect of change in MLA on plant growth was investigated by the sensitivity analysis: MLA values observed at ambient and elevated [CO2] were substituted into a steady-state growth model to calculate the relative growth rate (R). At ambient [CO2], substitution of a high MLA (observed at elevated [CO2]) did not increase R, compared with R for a low MLA (observed at ambient [CO2]), whereas at elevated [CO2] the high MLA always increased R compared with R at the low MLA. These results suggest that the increase in MLA contributes to growth enhancement under elevated [CO2]. The optimal combination of fLM and MLA to maximize R was determined for different [CO2] and N availabilities. The optimal fLM was nearly constant, while the optimal MLA increased at elevated [CO2], and decreased at higher N availabilities. The changes in fLM of actual plants may compensate for the limited plasticity of MLA.

Original languageEnglish
Pages (from-to)905-914
Number of pages10
JournalAnnals of botany
Issue number7
Publication statusPublished - 2003


  • Elevated [CO]
  • Growth model
  • Leaf mass per area
  • Leaf mass ratio
  • Leaf nitrogen
  • Optimal allocation
  • Root:shoot ratio
  • Sensitivity analysis

ASJC Scopus subject areas

  • Plant Science


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