The Effect of Kinetin on Stomatal Opening and the Rate of Intake of Carbon Dioxide in Mature Primary Leaves of Barley

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Abstract
Treatment of mature primary leaves of barley with 3×10−6 M solutions of kinetin resulted in increased rates of net assimilation of carbon dioxide. The resulting reduction in the concentration of carbon dioxide inside the leaves was considered as one factor causing the observed decreases in stomatal resistances, but, in addition, kinetin appeared to affect the stomatal mechanism directly.