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physcomitrella/potassio
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Potassium transport systems in the moss Physcomitrella patens: pphak1 plants reveal the complexity of potassium uptake.
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Potassium uptake is one of the most basic processes of plant physiology. However, a comprehensive description is lacking. At a cellular level fungi have provided a helpful but imperfect plant model, which we aim to improve using Physcomitrella patens. Blast searches in expressed sequence tag
Knockouts of Physcomitrella patens CHX1 and CHX2 transporters reveal high complexity of potassium homeostasis.
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This study aims to increase our understanding of the functions of CHX transporters in plant cells using the model plant Physcomitrella patens, in which four CHX genes have been identified, PpCHX1-PpCHX4. Two of these genes, PpCHX1 and PpCHX2, are expressed at approximately the same level as the
The potassium transporters HAK2 and HAK3 localize to endomembranes in Physcomitrella patens. HAK2 is required in some stress conditions.
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The function of HAK transporters in high-affinity K+ uptake in plants is well established; this study aims to demonstrate that some transporters of the same family play important roles in endomembranes. The PpHAK2-PpHAK4 genes of Physcomitrella patens encode three transporters of high sequence
Calmodulin-binding proteins in bryophytes: identification of abscisic acid-, cold-, and osmotic stress-induced genes encoding novel membrane-bound transporter-like proteins.
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Plant responses to environmental stresses are mediated in part by signaling processes involving cytosolic Ca2+ and a Ca(2+)-binding protein, calmodulin. Screening with radiolabeled calmodulin of a cDNA library of the moss Physcomitrella patens resulted in identification of genes encoding novel
Light- and dark-induced action potentials in Physcomitrella patens.
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Glass microelectrodes were inserted into Physcomitrella patens gametophyte leaves and action potentials (APs) were recorded in response to sudden illumination as well as after darkening, i.e., when the dark-induced membrane depolarization crossed a threshold. Application of 5 mM La(3+) (a calcium
Cold- and menthol-evoked membrane potential changes in the moss Physcomitrella patens: influence of ion channel inhibitors and phytohormones.
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Microelectrode measurements carried out on leaf cells from Physcomitrella patens revealed that a sudden temperature drop and application of menthol evoked two types of different-shaped membrane potential changes. Cold stimulation evoked spike-type responses. Menthol depolarized the cell membrane
Cation-permeable vacuolar ion channels in the moss Physcomitrella patens: a patch-clamp study.
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Patch-clamp studies carried out on the tonoplast of the moss Physcomitrella patens point to existence of two types of cation-selective ion channels: slowly activated (SV channels), and fast-activated potassium-selective channels. Slowly and instantaneously saturating currents were observed in the
Role of ENA ATPase in Na(+) efflux at high pH in bryophytes.
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Potassium or Na(+) efflux ATPases, ENA ATPases, are present in all fungi and play a central role in Na(+) efflux and Na(+) tolerance. Flowering plants lack ENA ATPases but two ENA ATPases have been identified in the moss Physcomitrella patens, PpENA1 and PpENA2. PpENA1 mediates Na(+) efflux in
Phylogenetic analysis of k(+) transporters in bryophytes, lycophytes, and flowering plants indicates a specialization of vascular plants.
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As heritage from early evolution, potassium (K(+)) is absolutely necessary for all living cells. It plays significant roles as stabilizer in metabolism and is important for enzyme activation, stabilization of protein synthesis, and neutralization of negative charges on cellular molecules as proteins
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