Abstract
Stomata on both upper and lower epidermis of the Argenteum mutant of Pisum sativum were found to respond to light, with no significant difference in behaviour between the two types. Stomata on the lower epidermis also responded to CO 2 , exhibiting a larger CO 2 response than light response. There appears to be a peak of response to light in the absence of CO 2 , and also to CO 2 in the light, at 25 mol m -3 KCl; while the peak of response to CO 2 in the dark is almost as large as that in the light, but occurs at 75 mol m -3 KCl. The data are discussed in relation to the use of this mutant in future investigations into stomatal physiology.
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