title: Transcriptomic analysis of the primary roots of Alhagi sparsifolia in response to water stress.
abstract: BACKGROUND
  Alhagi sparsifolia is a typical desert phreatophyte and has evolved to withstand extreme dry, cold and hot weather. While A. sparsifolia represents an ideal model to study the molecular mechanism of plant adaption to abiotic stress, no research has been done in this aspect to date. Here we took advantage of Illumina platform to survey transcriptome in primary roots of A. sparsifolia under water stress conditions in aim to facilitate the exploration of its genetic basis for drought tolerance.
  
  
  RESULTS
  We sequenced four primary roots samples individually collected at 0, 6, 24 and 30h from the A. sparsifolia seedlings in the course of 24h of water stress following 6h of rehydration. The resulting 38,763,230, 67,511,150, 49,259,804 and 54,744,906 clean reads were pooled and assembled into 33,255 unigenes with an average length of 1,057 bp. All-unigenes were subjected to functional annotation by searching against the public databases. Based on the established transcriptome database, we further evaluated the gene expression profiles in the four different primary roots samples, and identified numbers of differently expressed genes (DEGs) reflecting the early response to water stress (6h vs. 0h), the late response to water stress (24h vs. 0h) and the response to post water stress rehydration (30h vs. 24h). Moreover, the DEGs specifically regulated at 6, 24 and 30h were captured in order to depict the dynamic changes of gene expression during water stress and subsequent rehydration. Functional categorization of the DEGs indicated the activation of oxidoreductase system, and particularly emphasized the significance of the 'Glutathione metabolism pathway' in response to water stress.
  
  
  CONCLUSIONS
  This is the first description of the genetic makeup of A. sparsifolia, thus providing a substantial contribution to the sequence resources for this species. The identified DEGs offer a deep insight into the molecular mechanism of A. sparsifolia in response to water stress, and merit further investigation.
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South Street, Beijing 100081, PR China.
authors.forename: Huanian
authors.initials: H
authors.lastname: Wu
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South Street, Beijing 100081, PR China.
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of plant science, Tarim University, Alar, Xinjiang 843300, PR China.
authors.forename: Wangbin
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South Street, Beijing 100081, PR China.
authors.forename: Xinwu
authors.initials: X
authors.lastname: Pei
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South Street, Beijing 100081, PR China.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South Street, Beijing 100081, PR China.
authors.forename: Shirong
authors.initials: S
authors.lastname: Jia
authors.affiliation: Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South Street, Beijing 100081, PR China.
authors.forename: Weimin
authors.initials: W
authors.lastname: Li
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D003681:Dehydration / Q000235:genetics*; D055864:Droughts; D007887:Fabaceae / Q000235:genetics*; D020869:Gene Expression Profiling / Q000379:methods; D018506:Gene Expression Regulation, Plant / Q000235:genetics; D017343:Genes, Plant / Q000235:genetics; D058977:Molecular Sequence Annotation / Q000379:methods; D018517:Plant Roots / Q000235:genetics*; D013312:Stress, Physiological / Q000235:genetics*; D059467:Transcriptome / Q000235:genetics*
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