Abstract
Key message
The molecular mechanism of potassium ion transport across membranes in conifers is poorly known. We isolated and analyzed a gene encoding a potassium transporter from the conifer Cryptomeria japonica.
Abstract
Potassium ion (K+) is an essential and the most abundant intracellular cation in plants. The roles of K+ in various aspects of plant life are closely linked to its transport across biological membranes such as the plasma membrane and the tonoplast, which is mediated by membrane-bound transport proteins known as transporters and channels. Information on the molecular basis of K+ membrane transport in trees, especially in conifers, is currently limited. In this study, we isolated one complementary DNA, CjKUP1, which is homologous to known plant K+ transporters, from Cryptomeria japonica. Complementation tests using an Escherichia coli mutant, which is deficient in K+ uptake activity, was conducted to examine the K+ uptake function of the protein encoded by CjKUP1. Transformation of the K+-uptake-deficient mutant with CjKUP1 complemented the deficiency of this mutant. This result indicates that CjKUP1 has a function of K+ uptake. The expression levels of CjKUP1 in male strobili were markedly higher from late September to early October than in other periods. The expression levels in male and female strobili were higher than those in other organs such as needles, inner bark, differentiating xylem, and roots. These results indicate that CjKUP1 is mainly involved in K+ membrane transport in the cells of reproductive organs of C. japonica trees, especially in male strobili during pollen differentiation.
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Author contribution statement
Y.H. designed the study and drafted the manuscript. Y.H. and Y.K. carried out gene isolation, sequence analysis, and gene expression analysis. Y.H., K.N., and N.U. participated in complementation tests. N.U. and K.N. helped to draft the manuscript. All authors read and approved the manuscript.
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This study was performed through Special Coordination Funds for Promoting Science and Technology of the Ministry of Education, Culture, Sports, Science and Technology, the Japanese Government. The authors are grateful to Associate Prof. T. Shimosato for technical assistance with real-time RT-PCR.
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The authors declare that they have no conflict of interest.
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Hosoo, Y., Kimura, Y., Nanatani, K. et al. Molecular cloning and expression analysis of a gene encoding KUP/HAK/KT-type potassium uptake transporter from Cryptomeria japonica . Trees 28, 1527–1537 (2014). https://doi.org/10.1007/s00468-014-1059-1
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DOI: https://doi.org/10.1007/s00468-014-1059-1