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Plant Physiology 55:978-981 (1975) © 1975 American Society of Plant Biologists Light Sensitivity of 22Na, 86Rb, and 42K Absorption by Different Tissues of Bean Leaves 1a Department of Agricultural Botany, The Hebrew University, Rehovot 76 100, Israel
Autoradiographs of 22Na-loaded bean (Phaseolus vulgaris L. cv. `Brittle Wax') leaf slices showed that most of the tracer was concentrated in vascular tissue. Rubidium-86 was uniformly distributed in slices that had been incubated in darkness; after incubation in the light many small dark spots appeared on the autoradiographs, apparently corresponding with the stomata. Autoradiographs of 42K-loaded slices showed a rather uniform distribution of the tracer, whether the slices had been incubated in light or in darkness.
1 Supported by a grant from the Central Research Fund of The Hebrew University of Jerusalem.
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