title: A maize stress-responsive NAC transcription factor, ZmSNAC1, confers enhanced tolerance to dehydration in transgenic Arabidopsis.
abstract: NAC proteins are plant-specific transcription factors that play essential roles in stress responses. However, only little information regarding stress-related NAC genes is available in maize. In this study, a maize NAC gene, ZmSNAC1, was cloned and functionally characterized. Expression analysis revealed that ZmSNAC1 was strongly induced by low temperature, high-salinity, drought stress, and abscisic acid (ABA) treatment, but downregulated by salicylic acid treatment. Subcellular localization experiments in Arabidopsis protoplast cells indicated that ZmSNAC1 was localized in the nucleus. Transactivation assays demonstrated that ZmSNAC1 functioned as a transcriptional activator. Overexpression of ZmSNAC1 in Arabidopsis led to hypersensitivity to ABA and osmotic stress at the germination stage, but enhanced tolerance to dehydration compared to wild-type seedlings. These results suggest that ZmSNAC1 functions as a stress-responsive transcription factor in positive modulation of abiotic stress tolerance, and may have applications in the engineering of drought-tolerant crops.
  
  
  CONCLUSIONS
  ZmSNAC1 functioned as a stress-responsive transcription factor in response to abiotic stresses, and might be useful for crop tolerance improvement.
authors.affiliation: Institute of Crop Science, Chinese Academy of Agricultural Sciences, The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Beijing, 100081, China.
authors.forename: Min
authors.initials: M
authors.lastname: Lu
authors.forename: Sheng
authors.initials: S
authors.lastname: Ying
authors.forename: Deng-Feng
authors.initials: DF
authors.lastname: Zhang
authors.forename: Yun-Su
authors.initials: YS
authors.lastname: Shi
authors.forename: Yan-Chun
authors.initials: YC
authors.lastname: Song
authors.forename: Tian-Yu
authors.initials: TY
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D000222:Adaptation, Physiological / Q000187:drug effects / Q000235:genetics; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D003681:Dehydration; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D018525:Germination / Q000187:drug effects / Q000235:genetics; D008969:Molecular Sequence Data; D009997:Osmotic Pressure / Q000187:drug effects; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D030821:Plants, Genetically Modified; D021381:Protein Transport / Q000187:drug effects; D017422:Sequence Analysis, DNA; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics; D013347:Subcellular Fractions / Q000187:drug effects / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015533:Transcriptional Activation / Q000187:drug effects / Q000235:genetics; D003313:Zea mays / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*
chemical_list: D010940:Plant Proteins; D014157:Transcription Factors; D000040:Abscisic Acid