Apoplastic transport of ions in the motor organ of Samanea.
Turgor-mediated leaf movements of the legume Samanea saman are associated with the migration of K(+) and Cl(-) between opposing sides of the motor organs (pulvini). We have investigated the pathway of this ion migration by localizing K(+) and Cl(-) within the secondary pulvinus at various times during leaf movements. Ion distributions in freeze-dried cryosections of pulvini were determined by scanning electron microscopy/x-ray microanalysis. The results indicate that the apoplast is a major pathway for the migration of K(+) and Cl(-) within the pulvinus.
Section of Plant Biology, Cornell University, Ithaca, New York 14853.
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Campbell
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Satter
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Garber