title: The temporal transcriptomic response of Pinus massoniana seedlings to phosphorus deficiency.
abstract: BACKGROUND
  Phosphorus (P) is an essential macronutrient for plant growth and development. Several genes involved in phosphorus deficiency stress have been identified in various plant species. However, a whole genome understanding of the molecular mechanisms involved in plant adaptations to low P remains elusive, and there is particularly little information on the genetic basis of these acclimations in coniferous trees. Masson pine (Pinus massoniana) is grown mainly in the tropical and subtropical regions in China, many of which are severely lacking in inorganic phosphate (Pi). In previous work, we described an elite P. massoniana genotype demonstrating a high tolerance to Pi-deficiency.
  
  
  RESULTS
  To further investigate the mechanism of tolerance to low P, RNA-seq was performed to give an idea of extent of expression from the two mixed libraries, and microarray whose probes were designed based on the unigenes obtained from RNA-seq was used to elucidate the global gene expression profiles for the long-term phosphorus starvation. A total of 70,896 unigenes with lengths ranging from 201 to 20,490 bp were assembled from 112,108,862 high quality reads derived from RNA-Seq libraries. We identified 1,396 and 943 transcripts that were differentially regulated (P<0.05) under P1 (0.01 mM P) and P2 (0.06 mM P) Pi-deficiency conditions, respectively. Numerous transcripts were consistently differentially regulated under Pi deficiency stress, many of which were also up- or down-regulated in other species under the corresponding conditions, and are therefore ideal candidates for monitoring the P status of plants. The results also demonstrated the impact of different Pi starvation levels on global gene expression in Masson pine.
  
  
  CONCLUSIONS
  To our knowledge, this work provides the first insight into the molecular mechanisms involved in acclimation to long-term Pi starvation and different Pi availability levels in coniferous trees.
authors.affiliation: Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous region (Guizhou University), Ministry of Education, Institute of Agro-bioengineering, Guizhou University, Guiyang, Guizhou Province, People's Republic of China; School of Forestry Science, Guizhou University, Guiyang, Guizhou Province, People's Republic of China; The School of Nuclear Technology and Chemical and Biological, Hubei University of Science and Technology, Xianning, Hubei Province, People's Republic of China.
authors.forename: Fuhua
authors.initials: F
authors.lastname: Fan
authors.affiliation: Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous region (Guizhou University), Ministry of Education, Institute of Agro-bioengineering, Guizhou University, Guiyang, Guizhou Province, People's Republic of China.
authors.forename: Bowen
authors.initials: B
authors.lastname: Cui
authors.affiliation: Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous region (Guizhou University), Ministry of Education, Institute of Agro-bioengineering, Guizhou University, Guiyang, Guizhou Province, People's Republic of China.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous region (Guizhou University), Ministry of Education, Institute of Agro-bioengineering, Guizhou University, Guiyang, Guizhou Province, People's Republic of China.
authors.forename: Guang
authors.initials: G
authors.lastname: Qiao
authors.affiliation: School of Forestry Science, Guizhou University, Guiyang, Guizhou Province, People's Republic of China.
authors.forename: Guijie
authors.initials: G
authors.lastname: Ding
authors.affiliation: Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous region (Guizhou University), Ministry of Education, Institute of Agro-bioengineering, Guizhou University, Guiyang, Guizhou Province, People's Republic of China.
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Wen
mesh_terms: D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D010758:Phosphorus / Q000032:analysis*; D028223:Pinus / Q000235:genetics* / Q000254:growth & development; D036226:Seedlings / Q000235:genetics* / Q000254:growth & development; D012987:Soil / Q000737:chemistry*; D059467:Transcriptome
chemical_list: D012987:Soil; D010758:Phosphorus