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Plant Physiology 55:978-981 (1975)
© 1975 American Society of Plant Biologists

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Light Sensitivity of 22Na, 86Rb, and 42K Absorption by Different Tissues of Bean Leaves 1

Benjamin Jacoby

a 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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