Abstract
The abscissic acid (ABA) transduction cascade following the plasmalemma perception was analyzed in intact Arabidopsis thaliana suspension cells. In response to impermeant ABA, anion currents were activated and K(+) inward rectifying currents were inhibited. Anion current activation was required for the ABA specific expression of RAB18. By contrast, specific inhibition of K(+) channels by tetraethylammonium or Ba(2+) did not affect RAB18 expression. Thus, outer plasmalemma ABA perception triggered two separated signaling pathways.
MeSH terms
-
Abscisic Acid / pharmacology*
-
Anions
-
Arabidopsis / physiology*
-
Arabidopsis Proteins*
-
Barium Compounds / pharmacology
-
Chlorides / pharmacology
-
Electric Conductivity
-
Gene Expression / drug effects*
-
Ion Channels / antagonists & inhibitors
-
Ion Channels / physiology*
-
Patch-Clamp Techniques
-
Plant Proteins / genetics*
-
Potassium Channel Blockers
-
Potassium Channels / physiology
-
Signal Transduction
-
Tetraethylammonium / pharmacology
-
Zinc Sulfate / pharmacology
-
rab GTP-Binding Proteins*
Substances
-
Anions
-
Arabidopsis Proteins
-
Barium Compounds
-
Chlorides
-
Ion Channels
-
Plant Proteins
-
Potassium Channel Blockers
-
Potassium Channels
-
rab18 protein, Arabidopsis
-
barium chloride
-
Tetraethylammonium
-
Abscisic Acid
-
Zinc Sulfate
-
rab GTP-Binding Proteins