Article

Journal of Chemical Ecology

, Volume 13, Issue 1, pp 203-218

Ozone-induced changes in host-plant suitability: Interactions ofKeiferia lycopersicella andLycopersicon esculentum

  • John T. TrumbleAffiliated withDepartment of Entomology, University of California
  • , J. Daniel HareAffiliated withDepartment of Entomology, University of California
  • , Robert C. MusselmanAffiliated withStatewide Air Pollution Laboratory, University of California
  • , Patrick M. McCoolAffiliated withStatewide Air Pollution Laboratory, University of California

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Abstract

Tomato pinworms,Keiferia lycopersicella (Walsingham), survived better and developed faster on tomato plants,Lycopersicon esculentum Mill., damaged by ozone than on plants not subjected to ozone fumigation. Other measures of fitness, including survival during pupation, sex ratio of adults, female longevity, and fecundity, were not affected. Analyses of ozonated foliage at zero, two, and seven days following fumigation demonstrated a transient but significant increase (18–24%) in soluble protein concentration. Although the concentration of the total free amino acids in ozonated foliage did not increase significantly, significant changes were observed in at least 10 specific amino acids, some of which are critical for either insect development or the production of plant defensive chemicals. A reduction in total nitrogen in ozonated foliage at seven days postfumigation indicated that nitrogen was being translocated to other portions of the plant. The implications of increases in assimilable forms of nitrogen in ozonated foliage, which lead to improved host-plant suitability for insect herbivores, are discussed both in relation to some current ecological theories and in regard to pest-management strategies.

Key words

Ozone nutrition insect-plant interactions nitrogen secondary plant compounds Keiferia lycopersicella Lepidoptera Gellechiidae tomato Lycopersicon esculentum