Abstract
A cDNA clone was isolated from tree peony (Paeonia suffruticosa) subtractive cDNA library of burst buds and characterized with regard to its sequence, expression in response to chilling treatment during the release of bud dormancy, and its function in transgenic Arabidopsis thaliana. The clone, designated as PsMPT, contains 1,615 nucleotides with an open reading frame of 1,119 nucleotides, and the deduced amino acid sequence shows high homology with mitochondrial phosphate transporters (MPTs) from various organisms. The mRNA accumulation of PsMPT in tree peony was strongly induced by chilling treatment during the release of bud dormancy. When the treated plants were transferred to normal growth conditions, the level of PsMPT transcripts induced by sufficient chilling could be maintained high, whereas that induced by insufficient chilling decreased sharply. The transgenic Arabidopsis plants that overexpress PsMPT showed rapid growth and earlier flowering than wild-type plants. ATP contents in the transgenic plants were much higher than that in wild-type plants through various developmental stages. Together, these results suggest that the product of PsMPT is a MPT and might play an important role during the release of bud dormancy in tree peony.
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Abbreviations
- CTAB:
-
Cetyltrimethyl ammonium bromide
- MPT:
-
Mitochondrial phosphate transporter
- NEM:
-
N-ethylmaleimide
- Pi :
-
Inorganic phosphate
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Acknowledgments
This work was supported by the Shandong Natural Science Foundation (Grant No. Z2005D04), the National Basic Research Program (Grant 2006CB1001006) and Program for Changjiang Scholars and Innovative Research Team in University (Grant IRT0635) in China.
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Huang, X., Zhu, W., Dai, S. et al. The involvement of mitochondrial phosphate transporter in accelerating bud dormancy release during chilling treatment of tree peony (Paeonia suffruticosa). Planta 228, 545–552 (2008). https://doi.org/10.1007/s00425-008-0757-6
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DOI: https://doi.org/10.1007/s00425-008-0757-6