SUMMARY'Tiny Tim' Tomato plants were exposed To five CO^ Treatments (375 (ambient), 450, 525, 600 or 675 //mo! mol'^) in combination with Oy (0 or 80 nmol moi"'). Biomass was evaluated following 3, 5, 7 and 13 wk exposure. Biomass following 13 wk exposure also included weekly harvesTs of maTure tomato fruit beginning week 8. Carbon dioxide enrichment significantly enhanced total vegetative plant d. wt at each harvest, as wel! as cumu!ati\-e yield of mature fruit, whereas O., significanTly suppressed ToTa! \ efjetaTi^ e planT d. wt at each harvest and reduced total cumulative fruit yield. The magnitude of these changes varied wiTh the de^'eiopment of tomato from early growth To maTure fruiT yield. Carbon dioxide enrichment reduced the deTrimentai effects of Og on total vegetati\'e plant d. w-t of tomato following 3, 5, 7 and 13 wk exposure. Fina! maTure fruit yield was 24''o higher under enriched CO., treatments than in ambient CO^. Ozone suppressed final yield by l)\°o following exposure to 80 nmol mo!"' O^ when compared with exposure to charcoal-filtered (CF) air. The impacts of both CO, and O3 on yield were, however, dependent upon the presence or absence of the other gas. In the absence of O^, yields were very similar for the ambient and elevated CO^ TreaTments, but in the presence of Og, yields under ambient COŵ ere greatly suppressed whereas yields under elevated CO^ were similar to those in the absence of O^. Thus, enriched CO,^ ameliorated most of the suppressive efiPect of O3 on yield of mature fruit.
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