Abstract
The effect of ozone (O 3) concentration on the growth of Lycopersicon esculentum was studied at different photosynthetic photon flux densities (PPFD), relative air humidities (RH) and carbon dioxide (CO 2) concentrations. Increasing the O 3 concentration from < 10 to 85 nl 1 −1 for 6 h per day reduced the shoot dry weight 35% at 70% RH and 62% at 90% RH. Increasing the PPFD from 100 to 350 μmol m −2s −1 significantly reduced the effect of O 3 in one of two experiments. The most pronounced interaction between RH, PPFD and O 3 was found on plant height. High O 3 levels generally decreased plant height at low PPFD and had no, or a stimulating, effect at high PPFD. Raising the RH from 70 to 90% significantly increased the negative effect of O 3 on height. Increasing the O 3 concentration from <10 to 65 nl 1 −1 significantly decreased plant height at low CO 2 concentration (300–340 μl 1 −1), but small effects were found at high CO 2 concentration (700–800 μl 1 −1).
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