Guard cell inward K+ channel activity in Arabidopsis involves expression of the twin channel subunits KAT1 and KAT2 - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Journal of Biological Chemistry Année : 2001

Guard cell inward K+ channel activity in Arabidopsis involves expression of the twin channel subunits KAT1 and KAT2

Résumé

Stomatal opening, which controls gas exchanges between plants and the atmosphere, results from an increase in turgor of the two guard cells that surround the pore of the stoma. KAT1 was the only inward K+ channel shown to be expressed in Arabidopsis guard cells, where it was proposed to mediate a K+ influx that enables stomatal opening. We report that another Arabidopsis K+channel, KAT2, is expressed in guard cells. More than KAT1, KAT2 displays functional features resembling those of native inward K+ channels in guard cells. Coexpression inXenopus oocytes and two-hybrid experiments indicated that KAT1 and KAT2 can form heteromultimeric channels. The data indicate that KAT2 plays a crucial role in the stomatal opening machinery.

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Dates et versions

hal-02674634 , version 1 (31-05-2020)

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Guillaume Pilot, Benoît Lacombe, Frédéric Gaymard, Isabelle Chérel, Jossia Boucherez, et al.. Guard cell inward K+ channel activity in Arabidopsis involves expression of the twin channel subunits KAT1 and KAT2. Journal of Biological Chemistry, 2001, 276 (5), pp.3215-3221. ⟨10.1074/jbc.M007303200⟩. ⟨hal-02674634⟩
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