An Investigation into the Stomatal Behaviour of a Wilty Mutant ofPisum sativum

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Abstract
The water relations and stomatal behaviour of a wilty line of pea (JI 1069) were investigated and compared with those of several non-wilty lines (JI 1180, JI 1194, and JI 74). The leaves of the wilty line were found to have a lower percent water content, water potential and diffusive resistance and the dimensions of the stomatal cells were larger than those of the non-wilty types. The aperture of stomata on epidermal samples taken from plants in the light or dark period of a diurnal rhythm was consistently larger for the wilty pea than for the non-wilty lines, however, their stomatal responses on detached epidermis to light, CO2 and KC1 concentration were similar. There was no difference in response to ABA of stomata on detached epidermis of wilty or non-wilty types of pea.