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Journal of Experimental Botany, Vol. 54, No. 383, pp. 663-667, February 1, 2003
© 2003 Oxford University Press

Potassium-selective channel in the red beet vacuolar membrane

Received 13 June 2002; Accepted 3 October 2002

Igor I. Pottosin1,, Manuel Martínez-Estévez2,, Oxana R. Dobrovinskaya and Jesús Muñiz

Centro Universitario de Investigaciones Biomedicas, Universidad de Colima, 28047 Colima, Col., México

1 To whom correspondence should be addressed. Fax: +52 312 31 27581. E-mail: pottosin{at}cgic.ucol.mx
2 Present address: Centro de Investigación Científica de Yucatán, 97200 Mérida, Yucatán, México.

In higher plants the vacuolar K+-selective (VK) channel was identified solely in guard cells. This patch-clamp study describes a 40 pS homologue of the VK channel in Beta vulgaris taproot vacuoles. This voltage-independent channel is activated by submicromolar Ca2+, and is ideally selective for K+ over Cl– and Na+.

Key words: Beta vulgaris, patch-clamp, potassium channel, salt stress, vacuole.


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