Biochemical and hormonal control of K+ homeostasis
Cation 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.
| Main Authors: | , , , , , , |
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| Format: | comunicación de congreso biblioteca |
| Language: | English |
| Published: |
International Plant Growth Substances Association
2010
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| Online Access: | http://hdl.handle.net/10261/57135 |
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