biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 38:495, 1996 | DOI: 10.1007/BF02890594

Electrogenic K+H+ exchange in excised wheat roots

V. Pakhomova1,*
1 Kazan State University, Botanical Garden, Kazan, Russia

Root excision fromTriticum vulgare L. var.muticum seedlings induced a membrane potential drop, homeostasis disturbances, and loss of absorbing capacity in roots. During subsequent 3 - 4 h incubation the initial physiological properties of the roots were restored. At that period K+absorption could be blocked by tetraethylammonium (TEA) without changing pH of the incubation medium. After 5 - 6 h of incubation the membrane hyperpolarization and the enhancement of the absorbing capacity were observed. At that period K+ influx, at presence or absence of valinomycin in incubation medium, was coupled with acidification of the external medium and was not blocked by TEA.

Keywords: ion uptake; tetraethylammonium; Triticum vulgare; valinomycin

Received: August 1, 1995; Accepted: February 28, 1996; Published: December 1, 1996  Show citation

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Pakhomova, V. (1996). Electrogenic K+H+ exchange in excised wheat roots. Biologia plantarum, 38(4), 495. doi: 10.1007/BF02890594
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