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Reference Detail
| Reference | ||
|---|---|---|
| Author | Garciadeblas,B., Senn,M.E., Banuelos,M.A. and Rodriguez-Navarro,A. | |
| Title | Sodium transport and HKT transporters: the rice model. | |
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Abstract: Na+ uptake in the roots of K+-starved seedlings of barley, rice, and wheat was found to exhibit fast rate, low Km, and high sensitivity to K+. Sunflower plants responded in a similar manner but the uptake was not K+ sensitive. Ba2+ inhibited Na+ uptake, but not K+ uptake in rice roots. This demonstrated that Na+ and K+ uptake are mediated by different transporters, and that K+ blocked but was not transported by the Na+ transporter. The genome of rice cv. Nipponbare contains seven HKT genes, which may encode Na+ transporters, plus two HKT pseudogenes. Yeast expressions of OsHKT1 and OsHKT4 proved that they are Na+ transporters of high and low affinity, respectively, which are sensitive to K+ and Ba2+. Parallel experiments of K+ and Na+ uptake in yeast expressing the wheat or rice HKT1 transporters proved that they were very different; TaHKT1 transported K+ and Na+, and OsHKT1 only Na+. Transcript expressions in shoots of the OsHKT genes were fairly constant and insensitive to changes in the K+ and Na+ concentrations of the nutrient solution. In roots, the expressions were much lower than in shoots, except for OsHKT4 and OsHKT1 in K+-starved plants. We propose that OsHKT transporters are involved in Na+ movements in rice, and that OsHKT1 specifically mediates Na+ uptake in rice roots when the plants are K+ deficient. The incidence of HKT ESTs in several plant species suggests that the rice model with many HKT genes applies to other plants. |
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| Journal | Plant J. | |
| Country | Spain | |
| Volume | 34(6) | |
| Pages | 788-801 | |
| Year | 2003 | |
| PubMed ID | 12795699 | |
| PubMed Central ID | - | |
| DOI | 10.1046/j.1365-313X.2003.01764.x | |
| URL | - | |
| Relation | ||
| Gene | HKT1 HKT2 HKT3 HKT4 HKT5 HKT6 HKT7 HKT9 SKC1 | |
| INSD | AJ491854 AJ491855 AJ506745 AJ491815 AJ491816 AJ491817 AJ491818 AJ491819 AJ491820 AJ491852 AJ491853 | |
| Strain | Wild Core Collection | - |
| Induced Mutation Lines(NIG Collection) | - | |
| Sterile Seed Strain | - | |
|
Lethal Embryo Mutantion Strain |
- | |
|
Stages in Each Organ - Muant Lines (Gene) |
- | |
| Cultivated Varieties(NIG Collection) | - | |
| Stages in Each Organ | - | |
