Abstract
According to sequences of H+-pyrophosphatase genes from GenBank, a new H+-pyrophosphatase gene (KfVP1) from the halophyte Kalidium foliatum, a very salt-tolerant shrub that is highly succulent, was obtained by using reverse transcription PCR and rapid amplification of cDNA ends methods. The obtained KfVP1 cDNA contained a 2295 bp ORF and a 242 bp 3′-untranslated region. It encoded 764 amino acids with a calculated molecular mass of 79.78 kDa. The deduced amino acid sequence showed high identity to those of H+-PPase of some Chenopodiaceae plant species. Semi-quantitative PCR results revealed that transcription of KfVP1 in K. foliatum was induced by NaCl, ABA and PEG stress. Transgenic lines of A. thaliana with 35S::KfVP1 were generated. Three transgenic lines grew more vigorous than the wild type (ecotype Col-0) under salt and drought stress. Moreover, the transgenic plants accumulated more Na+ in the leaves compared to wild type plants. These results demonstrated that KfVP1 from K. foliatum may be a functional tonoplast H+-pyrophosphatase in contributing to salt and drought tolerance.
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Abbreviations
- KfVP1 :
-
Tonoplast H+-pyrophosphatase gene of Kalidium foliatum
- ORF:
-
Open reading frame
- RACE:
-
Rapid amplification of cDNA ends
- TLs:
-
Transgenic lines
- RWC:
-
Relative water content
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Acknowledgments
We would like to thank Dr. Haiyan Lan, Dr. Ji Ma and Mr. Yonghai Liang for their technical assistance of this work. This research was financially supported by PhD Initiation Fund of Xinjiang University (No. BS080123) and the Xinjiang Key Laboratory of Biological Resources and Genetic Engineering (No. XJDX0201-2005-05).
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11033_2012_1645_MOESM1_ESM.jpg
Supplementary Fig. 1 Nucleotide sequence and deduced amino acid sequence of H+-PPase cDNA of Kalidium foliatum. The boxed amino acid residues were recognized by the peptide-specific antibodies, PABTK and PABHK, respectively. The termination codon is marked with an asterisk. (JPEG 115 kb)
11033_2012_1645_MOESM2_ESM.jpg
Supplementary Fig. 2 The prediction of the across membrane domain of the protein KfVP1 was calculated by the program TMHMM available at http://www.cbs.dtu.dk/ services/TMHMM. (JPEG 45 kb)
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Yao, M., Zeng, Y., Liu, L. et al. Overexpression of the halophyte Kalidium foliatum H+-pyrophosphatase gene confers salt and drought tolerance in Arabidopsis thaliana . Mol Biol Rep 39, 7989–7996 (2012). https://doi.org/10.1007/s11033-012-1645-5
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DOI: https://doi.org/10.1007/s11033-012-1645-5