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Biochemical and hormonal control of K+ homeostasis

AuthorsLeidi, Eduardo O. ; Barragán, Verónica ; Rubio, Lourdes; Andrés, Zaida ; Cubero, Beatriz ; Quintero, Francisco J. ; Pardo, José M.
Issue Date2010
PublisherInternational Plant Growth Substances Association
Citation20th International Conference on Plant Growth Substances
AbstractCation antiporters of NHX family have been shown to increase the salt tolerance of various plants species and are thought to mediate compartmentation of Na+ in vacuoles. However, all isoforms characterized so far catalyze both Na+/H+ and K+/H+ exchange. Genetic evidence will be presented that NHX-type proteins are likely candidates for the H+-linked K+-transport that is thought to facilitate active K+ uptake at the tonoplast and the partitioning of K+ between vacuole and cytosol. This critical function should be taken into consideration for understanding the salt tolerance phenotype of plants overexpressing NHX-type exchangers. Recent findings show that ethylene and reactive oxygen species mediate the plant response to potassium deprivation. The transcriptional induction of the high-affinity K+ transporter gene HAK5 and changes in root morphology are among the adaptative responses to low K+ that regulated by ethylene.
Appears in Collections:(IRNAS) Comunicaciones congresos
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