Abstract
Factorial experiments in two growing seasons in open-top field chambers with two or three O3 concentrations and two primocane-fruiting raspberry (Rubus idaeus L.) cultivars were used to obtain dose-response relationships describing the effects of seasonal O3 exposure on raspberry plant vegetative and reproductive growth. At the lower concentration (0.12 μl·liter-1), the response to O3 was nonsignificant. However, at 0.24 μl·liter-1, `Heritage' showed a significant decline relative to the control in cane height, node count, cane diameter, and dry weight. These changes were accompanied by a 52% decrease in yield, caused mainly by a reduction in fruit count. In contrast, vegetative and yield characters of the `Redwing' were not affected by O3.
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