2004
DOI: 10.1111/j.1365-313x.2004.02273.x
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Abscisic acid and 14‐3‐3 proteins control K+ channel activity in barley embryonic root

Abstract: Summary Germination of seeds proceeds in general in two phases, an initial imbibition phase and a subsequent growth phase. In grasses like barley, the latter phase is evident as the emergence of the embryonic root (radicle). The hormone abscisic acid (ABA) inhibits germination because it prevents the embryo from entering and completing the growth phase. Genetic and physiological studies have identified many steps in the ABA signal transduction cascade, but how it prevents radicle elongation is still not clear.… Show more

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Cited by 71 publications
(30 citation statements)
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References 76 publications
(100 reference statements)
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“…GORK is a plasma membrane K + channel, with one of its biological functions linked to the regulation of stomatal aperture and transpiration ([42], [43]). 14-3-3s have previously been proposed as a master regulator of ion homeostasis across the plasma membrane, with evidence for regulation of the plasma membrane proton pump as well as K in and K out channels [44]. More recently, 14-3-3 has been implicated in the regulation of two specific K + channels, AtTPK1 (KCO1), a vacuolar membrane localized K + channel [45] and KAT1, a PM inward rectifying K + channel [46].…”
Section: Discussionmentioning
confidence: 99%
“…GORK is a plasma membrane K + channel, with one of its biological functions linked to the regulation of stomatal aperture and transpiration ([42], [43]). 14-3-3s have previously been proposed as a master regulator of ion homeostasis across the plasma membrane, with evidence for regulation of the plasma membrane proton pump as well as K in and K out channels [44]. More recently, 14-3-3 has been implicated in the regulation of two specific K + channels, AtTPK1 (KCO1), a vacuolar membrane localized K + channel [45] and KAT1, a PM inward rectifying K + channel [46].…”
Section: Discussionmentioning
confidence: 99%
“…It is well established that members of the 14-3-3 family seem to be ubiquitous in eukaryotes and play a diversity of roles in metabolism (Aitken, 1996;Ferl, 1996;Babakov et al, 2000;Fu et al, 2000;Muslin and Xing, 2000;Rosenquist et al, 2000;Sehnke et al, 2000Sehnke et al, , 2002Aitken et al, 2002;Dougherty and Morrison, 2004;Wijngaard et al, 2005). 14-3-3's have been associated with many subcellular processes and various methodologies have placed them in and within the influence of specific organelles.…”
Section: Discussionmentioning
confidence: 99%
“…The core 14-3-3 function would not be altered in this scenario, and those 14-3-3s, although diverse in sequence, would be homogenous in function. In seeming support of this notion, there is clear evidence for cell-and tissue-specific expression of 14-3-3s in both animals and plants (Daugherty et al, 1996;Testerink et al, 1999;Qiu et al, 2000;Han et al, 2001;Philip et al, 2001;Subramanian et al, 2001;Aitken, 2002;Fulgosi et al, 2002;Maraschin et al, 2003;Alsterfjord et al, 2004;van Hemert et al, 2004;Qi et al, 2005;Wijngaard et al, 2005).…”
Section: Introductionmentioning
confidence: 97%
“…Increased ion leakage from the 14-3-3λ mutant cells compared to Col-0 suggests a weaker cell membrane in 14-3-3λ mutants. The other reason for the increased ion leakage could be the H+ATPase and K+ pumps on the plasma membrane and tonoplast which has been shown to interact with 14-3-3 in several plant species (Fuglsang et al, 2007;Gobert et al, 2007;van den Wijngaard et al, 2005). For instance, the 14-3-3λ gene activates ATPK1 (AT5G55630), a member of K+ channel family mostly expressed in the tonoplast where it mediates the K+ selective currents between cytoplasmic and vacuolar components (Rapp & Hedrich, 2007).…”
Section: Discussionmentioning
confidence: 99%
“…These proteins have also been shown to help in maintaining ion homeostasis in plant cells. Potassium channel and H+ATPase transport proteins in the guard cells of A. thaliana are under the regulation of a 14-3-3 lending further evidence that they may serve a role in drought tolerance through regulation of these membrane proteins (Fuglsang et al, 2007;Schoonheim et al, 2007;van den Wijngaard et al, 2005). Specifically, association of 14-3-3 with H+ATPase occurs at the C-terminus in a phosphorylation-dependent manner (Bunney et al, 2001).…”
mentioning
confidence: 99%