Biomass allocation and leaf chemical defence in defoliated seedlings of Quercus serrata with respect to carbon-nitrogen balance

Kouki Hikosaka, Teruyuki Takashima, Daisuke Kabeya, Tadaki Hirose, Naoto Kamata

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

• Background and Aims: Both nutrient availability and defoliation affect the carbon-nutrient balance in plants, which in turn influences biomass allocation (e.g. shoot-to-root ratio) and leaf chemical composition (concentration of nitrogen and secondary compounds). In this study it is questioned whether defoliation alters biomass allocation and chemical defence in a similar fashion to the response to nutrient deficiency. • Methods: Current-year seedlings of Quercus serrata were grown with or without removal of all leaves at three levels of nutrient availability. • Key Results: Plant nitrogen concentration (PNC), a measure of the carbon-nutrient balance in the plant, significantly decreased immediately after defoliation because leaves had higher nitrogen concentrations than stems and roots. However, PNC recovered to levels similar to or higher than that of control plants in 3 or 6 weeks after the defoliation. Nitrogen concentration of leaves produced after defoliation was significantly higher than leaf nitrogen concentration of control leaves. Leaf mass per plant mass (leaf mass ratio, LMR) was positively correlated with PNC but the relationship was significantly different between defoliated and control plants. When compared at the same PNC, defoliated plants had a lower LMR. However, the ratio of the leaf to root tissues that were newly produced after defoliation as a function of PNC did not differ between defoliated and control plants. Defoliated plants had a significantly lower concentration of total phenolics and condensed tannins. Across defoliated and control plants, the leaf tannin concentration was negatively correlated with the leaf nitrogen concentration, suggesting that the amount of carbon-based defensive compounds was controlled by the carbon-nutrient balance at the leaf level. • Conclusions: Defoliation alters biomass allocation and chemical defence through the carbon-nutrient balance at the plant and at the leaf level, respectively.

Original languageEnglish
Pages (from-to)1025-1032
Number of pages8
JournalAnnals of botany
Volume95
Issue number6
DOIs
Publication statusPublished - 2005

Keywords

  • Carbon-nutrient balance
  • Defoliation
  • Nitrogen concentration
  • Quercus serrata
  • Secondary compounds
  • Shoot/root ratio
  • Tannins
  • Total phenolics

ASJC Scopus subject areas

  • Plant Science

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