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Journal of Experimental Botany, Vol. 52, No. 354, pp. 99-104, January 2001
© 2001 Oxford University Press

Original Papers

Glucose-induced activation of rubidium transport and water flux in sunflower root systems

José M. Quintero1, Raúl Molina2, José M. Fournier2, Manuel Benlloch2 and José Ramos3,4

1 Departamento de Ciencias Agroforestales, EUITA, Universidad de Sevilla, Ctra. Utrera, Km. 1, E-41013 Sevilla, Spain
2 Departamento de Agronomía, ETSIAM, Universidad de Córdoba, Apdo. 3048, E-14080 Córdoba, Spain
3 Departamento de Microbiología, ETSIAM, Universidad de Córdoba, Apdo. 3048, E-14080 Córdoba, Spain

Excised 20-d-old sunflower roots (Helianthus annuus L. cv. Sun-Gro 393) were used to study the effect of different sugars on rubidium and water fluxes. The roots sensed and absorbed glucose from the external medium inducing the activation of rubidium accumulated in the root (Rb+ root), the flux of exuded rubidium (JRb) and, to a lesser degree, the exudation rate (Jv). These effects were also triggered by fructose, but not by 6-deoxyglucose (6-dG), a glucose analogue which is not a substrate for hexokinase (HXK). The effect of 2-deoxyglucose (2-dG), an analogue that is phosphorylated but not further metabolized, was complex, suggesting an inhibitory effect on solute transport to the xylem. The amounts of glucose required to activate rubidium and water fluxes were similar to those previously reported to regulate different processes in other plants (0.5–10 mM). When sorbitol was used instead of glucose, neither rubidium uptake (Rb+ root plus JRb) nor Jv was activated. It is proposed that glucose present in the root plays an important signalling role in the regulation of Rb+ (K+) and water transport in plant roots.

Key words: Exudation rate, glucose, Helianthus annuus, rubidium transport, sunflower.


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