Expression of OsHAK genes encoding potassium ion transporters in rice
Regulation of K<sup>+</sup>/Na<sup>+</sup> homeostasis is an important mechanism in plant growth. The high-affinity K<sup>+</sup> uptake system plays a central role in this mechanism especially when plants experience environmental stresses of K<sup>+</sup> starvation and high salinity. K<sup>+</sup> channels and the K<sup>+</sup>/Na<sup>+</sup> co-transporter like HKT have been closely studied as principal members of the K<sup>+</sup> transport system in plants. The KT/HAK/KUP family is a major K<sup>+</sup> transporter family present in bacteria, fungi and plants. In plants, the KT/HAK/KUP transporters form a large family. <i>Arabidopsis thaliana</i> has 13 genes and rice has at least 25. KT/HAK/KUP transporters serve various functions in various K<sup>+</sup> traffic, but their physiological roles are still unclear. Plant KT/HAK/KUP transporters could be divided into 4 related clusters according to their amino acid sequences, the character of transporters belongs to each cluster was summarized. We analyzed the expression of <i>OsHAK</i> genes in rice roots under both K<sup>+</sup> starvation and salt stress conditions.
- Plant biotechnology
Plant biotechnology 25(3), 241-245, 2008-06-01
Japanese Society for Plant Cell and Molecular Biology