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Liu P.,Nanjing Agricultural University | Liu P.,Jiangsu Province Engineering Laboratory for Modern Facility Agriculture Technology and oEquipment | Chen S.,Nanjing Agricultural University | Song A.,Nanjing Agricultural University | And 7 more authors.
BMC Plant Biology | Year: 2014

Background: Inorganic phosphate (Pi) is essential for plant growth, and phosphorus deficiency is a main limiting factor in plant development. Its acquisition is largely mediated by Pht1 transporters, a family of plasma membrane-located proteins. Chrysanthemum is one of the most important ornamental plants, its productivity is usually compromised when grown in phosphate deficient soils, but the study of phosphate transporters in chrysanthemum is limited. Results: We described the isolation from chrysanthemum of a homolog of the Phosphate Transporter 1 (PT1) family. Its predicted product is a protein with 12 transmembrane domains, highly homologous with other high affinity plant Pi transporters. Real-time quantitative PCR analysis revealed that the gene was transcribed strongly in the root, weakly in the stem and below the level of detection in the leaf of chrysanthemum plants growing in either sufficient or deficient Pi conditions. Transcript abundance was greatly enhanced in Pi-starved roots. A complementation assay in yeast showed that CmPT1 partially compensated for the absence of phosphate transporter activity in yeast strain MB192. The estimated Km of CmPT1 was 35.2 μM. Under both Pi sufficient and deficient conditions, transgenic plants constitutively expressing CmPT1 grew taller than the non-transformed wild type, produced a greater volume of roots, accumulated more biomass and took up more phosphate. Conclusions: CmPT1 encodes a typical, root-expressed, high affinity phosphate transporter, plays an important role in coping Pi deficiency of chrysanthemum plants. © 2014 Liu et al.; licensee BioMed Central Ltd. Source


Ren L.,Nanjing Agricultural University | Ren L.,Jiangsu Province Engineering Laboratory for Modern Facility Agriculture Technology and oEquipment | Sun J.,Nanjing Agricultural University | Chen S.,Nanjing Agricultural University | And 12 more authors.
BMC Genomics | Year: 2014

A major constraint affecting the quality and productivity of chrysanthemum is the unusual period of low temperature occurring during early spring, late autumn, and winter. Yet, there has been no systematic investigation on the genes underlying the response to low temperature in chrysanthemum. Herein, we used RNA-Seq platform to characterize the transcriptomic response to low temperature by comparing different transcriptome of Chrysanthemum nankingense plants and subjecting them to a period of sub-zero temperature, with or without a prior low temperature acclimation.Results: Six separate RNA-Seq libraries were generated from the RNA samples of leaves and stems from six different temperature treatments, including one cold acclimation (CA), two freezing treatments without prior CA, two freezing treatments with prior CA and the control. At least seven million clean reads were obtained from each library. Over 77% of the reads could be mapped to sets of C. nankingense unigenes established previously. The differentially transcribed genes (DTGs) were identified as low temperature sensing and signalling genes, transcription factors, functional proteins associated with the abiotic response, and low temperature-responsive genes involved in post-transcriptional regulation. The differential transcription of 15 DTGs was validated using quantitative RT-PCR.Conclusions: The large number of DTGs identified in this study, confirmed the complexity of the regulatory machinery involved in the processes of low temperature acclimation and low temperature/freezing tolerance. © 2014 Ren et al.; licensee BioMed Central Ltd. Source

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