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Changes in the adaxial (a), abaxial (b), and total (adaxial plus abaxial) (c) gs for mature pea leaves during 10 d of UV-B treatment. Plants were grown from seed for 21 d prior to these measurements either without UV-B radiation (○) or with 0.30 (▵) or 0.63 (□) W m−2 of UV-B radiation. Another treatment of 0.21 W m−2 of UV-B had no detectable effect, and is not shown. Data are the means of six replicates ± 1 pooled se derived from ANOVA shown on the last day.
