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Plant Physiology 90:939-942 (1989)
© 1989 American Society of Plant Biologists

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Environmental and Stress Physiology

Two Modes of Rubidium Uptake in Sunflower Plants 1

Manuel Benlloch, Inés Moreno and Alonso Rodríguez-Navarro

Departamento de Agronomía, Escuela Técnica Superior de Ingenieros Agrónomos, E-14071 Córdoba, Spain, Departamento de Microbiología, Escuela Técnica Superior de Ingenieros Agrónomos, E-28040 Madrid, Spain

The Rb+-uptake kinetics in K+-starved sunflower (Helianthus annuus) plants can be explained by the addition of two Michaelis-Menten equations. In contrast, Rb+ uptake can be described by a single Michaelis-Menten equation in normal-K+ plants. Differences in the Kms and in the Arrhenius plots of Rb+ uptake in the two types of plants suggest two uptake modes.

1 Supported by a grant from Junta de Andalucía.




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