RESPONSES OF SPRUCE SEEDLINGS (PICEA ABIES) TO EXHAUST GAS UNDER LABORATORY CONDITIONS--I. PLANT-INSECT INTERACTIONS

This paper studied the effects of motor vehicle exhaust gases on Norway spruce seedlings (Picea abies Karst) and plant-insect interaction of spruce shoot aphid (Cinara pilicornis Hartig). The exhaust gas concentrations in the fumigation chambers were monitored and controlled by measuring the concentration of nitrogen oxides with a computer-aided feedback system. The concentrations of major exhaust gas components in the chamber air were also measured. Responses of Norway spruce seedlings to 2- and 3-week exhaust gas exposure and subsequent performance of spruce shoot aphid were studied using realistic exposure regimes; 50, 100, and 200 ppb NO sub(x). The feedback control system based on NO sub(x) concentrations proved an adequate and practical means for controlling the concentration of exhaust gases and studying plant responses in controlled environment chambers. The exhaust exposure resulted in increased concentrations of proline, glutamine, threonine, aspartic acid, glycine, and phenylalanine, and decreased concentrations of arginine, serine, alanine, and glycine in young needles. No changes in soluble N concentrations were observed. Results are interpreted as a stress response rather than use of NO sub(x) as a nitrogen source. No changes in total phenolics and only transient changes in some individual terpene concentrations were detected. The exhaust gas exposure stressed the exposed seedlings, but had no significant effect on N metabolism or the production of defense chemicals. Aphid performance was not significantly affected. Soluble N, secondary metabolism, and aphid performance were not sensitive to exhaust gas exposure during shoot elongation in Norway spruce.

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  • Authors:
    • Viskari, E-L
    • Surakka, J
    • Pasanen, P
    • Mirme, A
    • Koessi, S
    • Ruuskanen, J
    • Holopainen, J K
  • Publication Date: 2000

Language

  • English

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  • Accession Number: 00800465
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 27 2000 12:00AM