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XB-ART-12178
Proc Natl Acad Sci U S A 1999 Oct 12;9621:12186-91. doi: 10.1073/pnas.96.21.12186.
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Auxin-induced K+ channel expression represents an essential step in coleoptile growth and gravitropism.

Philippar K , Fuchs I , Luthen H , Hoth S , Bauer CS , Haga K , Thiel G , Ljung K , Sandberg G , Bottger M , Becker D , Hedrich R .


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Auxin-induced growth of coleoptiles depends on the presence of potassium and is suppressed by K+ channel blockers. To evaluate the role of K+ channels in auxin-mediated growth, we isolated and functionally expressed ZMK1 and ZMK2 (Zea mays K+ channel 1 and 2), two potassium channels from maize coleoptiles. In growth experiments, the time course of auxin-induced expression of ZMK1 coincided with the kinetics of coleoptile elongation. Upon gravistimulation of maize seedlings, ZMK1 expression followed the gravitropic-induced auxin redistribution. K+ channel expression increased even before a bending of the coleoptile was observed. The transcript level of ZMK2, expressed in vascular tissue, was not affected by auxin. In patch-clamp studies on coleoptile protoplasts, auxin increased K+ channel density while leaving channel properties unaffected. Thus, we conclude that coleoptile growth depends on the transcriptional up-regulation of ZMK1, an inwardly rectifying K+ channel expressed in the nonvascular tissue of this organ.

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References [+] :
Abel, Early genes and auxin action. 1996, Pubmed