Sugar Efflux from Attached Seed Coats of Glycine max (L.) Men.

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Abstract
Ellis, E. C. and Spanswick, R. M. 1987. Sugar efflux from attached seed coats of Glycine max (L.) Merr.—J. exp. Bot. 38: 1470—1483. Sugar efflux (sucrose + glucose) from attached seed coats of Glycine max (L.) Merr. was measured at high sampling rates to improve the kinetic characterization of seed coat exudation. This study confirms that sugar efflux in seed coats has at least two components, and demonstrates that the concentration of mannitol osmoticum bathing the seed coat may influence one or both of these components. High leaf irradiance increased sugar efflux relative to a low leaf irradiance at the same mannitol concentration. A high concentration of mannitol (500 mol m⊟3) enhanced sugar efflux relative to a medium concentration (100 mol m⊟3) under both high and low leaf irradiance. A low mannitol concentration (10 mol m⊟3) stimulated sugar efflux (relative to 100 mol m⊟3) to a greater extent when leaf irradiance was high. Rapid changes in mannitol concentration produced immediate stimulations of sugar efflux. Effects of osmoticum on sugar efflux are explained by simultaneous turgor-mediated effects on import of sucrose by the phloem and retrieval of apoplastic sucrose, presumably by seed coat parenchyma.

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