Nitrogen supply as a limiting factor determining the sensitivity of Populus tremuloides Michx. to ozone stress

E. J. PELL, J. P. SINN, C. VINTEN JOHANSEN

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Abstract

Seedlings of trembling aspen (Populus tremuloides Michx.) were grown at six rates of supplemental nitrogen (N). Five of the N rates were sub‐optimal to optimal for growth, whilst the sixth provided an excess of N with no additional growth benefit. The biomass of plants stressed by ozone (O3) in open‐top chambers was significantly reduced at optimal rates of N. Plants which received sub‐optimal or excess N showed no significant effects of O3 on biomass accumulation. Ozone induced two compensatory responses; increased shoot/root ratio and accelerated senescence, at all N rates. Growth rate was strongly influenced by the amount of N supplied, and O3‐induced reductions in total biomass were highly correlated with growth rate. We concluded that when growth rate was small as a result of N limitation, compensatory responses to O3 stress were sufficient to prevent detectable losses in biomass.

Original languageEnglish (US)
Pages (from-to)437-446
Number of pages10
JournalNew Phytologist
Volume130
Issue number3
DOIs
StatePublished - Jul 1995

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

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