Abstract
Ozone effects were studied by plant growth chamber to evaluate the impact of ozone () on the physiology of two hot pepper, Capsicum annuum L., cultivars, 'Dabotab' and 'Buchon'. Forty-day old plants with leaves were exposed to of was different from the varieties. 'Dabotab' was most sensitive to and 'Buchon' was resistant. Symptom of ozone damage on the leaves was bifacial necrosis. Decreases of net photosynthesis by were 56% and 40% on 'Dabotab' and 'Buchon', respectively. Decreases of stomatal conductance by were 66% and 63% on each variety. damage on net photosynthesis was started at the low levels of light on the two hot peppers. In addition, assimilation-internal concentration curves were not different from the two varieties. In conclusion, closed the stomata and decrease net photosynthesis on hot peppers regardless of the ozone sensitivity on leaf injury, but the difference of ecophysiological responses between the two varieties was not found clearly.
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