The Effect of Dichlorophenyldimethylurea on Light-Stimulated 22Na+, 42K+ and 86Rb+ Absorption in Different Tissues of Phaseolus vulgaris Leaves |
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Authors: | BENJAMIN JACOBY |
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Institution: | Department of Agricultural Botany, The Hebrew University, Rehovot 76100, Israel |
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Abstract: | The light-stimulated absorption of 86Rb+ by Phaseolus vulgaris L. leaf slices was found to be sensitive to dichlorophenyldimethylurea in air as well as in nitrogen, whereas light-stimulated 22Na+ absorption in nitrogen was not sensitive to this inhibitor. The absorption of 22Na+ is not affected by light in air. The absorption of 42K+ is enhanced by a dichlorophenyldimethylurea-insensitive light effect under anaerobic conditions and further increased by light in the absence of the inhibitor. Light-enhanced 42K+ absorption in air was also inhibited by dichlorophenyldimethylurea. Previous work showed that light-stimulated 86Rb+ and 42K+ absorption by Phaseolus vulgaris leaf slices is restricted to the guard cells. The present results are discussed with reference to the effect of light on stomatal opening. |
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