Journal
PHYSIOLOGIA PLANTARUM
Volume 139, Issue 2, Pages 220-228Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1399-3054.2010.01354.x
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Funding
- Fundacion Seneca of Murcia [08696/PI/08]
- Ministerio de Educacion y Ciencia
- CSIC
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The high-affinity K+ transporter AtHAK5 and the inward-rectifier K+ channel AtAKT1 have been described to contribute to K+ uptake in Arabidopsis thaliana. Studies with T-DNA insertion lines showed that both systems participate in the high-affinity range of concentrations and only AtAKT1 in the low-affinity range. However the contribution of other systems could not be excluded with the information and plant material available. The results presented here with a double knock-out athak5, atakt1 mutant show that AtHAK5 is the only system mediating K+ uptake at concentrations below 0.01 mM. In the range between 0.01 and 0.05 mM K+ AtHAK5 and AtAKT1 are the only contributors to K+ acquisition. At higher K+ concentrations, unknown systems come into operation and participate together with AtAKT1 in low-affinity K+ uptake. These systems can supply sufficient K+ to promote plant growth even in the absence of AtAKT1 or in the presence of 10 mM K+ where AtAKT1 is not essential.
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