Effect of Ethylene on Stomatal Opening in Tomato and Carnation Leaves

Exposure to ethylene at a concentration range of 60 to 70 ppmbrought about an increased stomatal closure within twelve hoursin two species of plants among the four studied. Both tomatoand carnation showed a response to ethylene treatment but couldcompletely recover within 96 hours after treatment. Pinto beanand Sedum pachyphyllum stomata showed little or no responseto ethylene. ¹Present address: Department of Biology, Montana State University,Bozeman, Montana 59715, U.S.A. (Received November 30, 1981; Accepted January 10, 1983)