4.1 Article

Cloning and characterization of an ABA-independent DREB transcription factor gene, HcDREB2, in Hemarthria compressa

Journal

HEREDITAS
Volume 153, Issue -, Pages -

Publisher

BMC
DOI: 10.1186/s41065-016-0008-y

Keywords

Cold stress; DREB transcription factor; Drought and salt stress; Hemarthria compressa; Yeast one-hybrid system

Funding

  1. National Basic Research Program of China (973 Program) [2014CB138705]
  2. National Modern Grass Industry Technology System [CARS-35-05]
  3. Sichuan Province Breeding Research grant [2011NZ0098-11]

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Background: Hemarthria compressa is a stoloniferous perennial tropical forage grass with a wide geographic distribution; however, environmental stress has a great influence on its growth. The DREB transcription factor family genes contains candidate genes for improving plant stress tolerance. Results: From cold-treated H. compressa plants, a putative DREB2 gene (HcDREB2) was cloned using the RACE-PCR method. HcDREB2 was 1296 bp in length and encoded a putative protein 264 amino acid residues long. HcDREB2 shared the highest sequence identity with DREB2 in sorghum. The expression of HcDREB2 was independent of ABA treatment, but inducible by low temperatures as well as drought and high salinity treatments. Yeast one-hybrid assays showed that HcDREB2 directly bound the DRE cis-acting element to transactivate the expression of the downstream reporter genes. Conclusions: HcDREB2, a stress-inducible but ABA-independent transcription factor gene, can transactivate downstream genes by binding to the DRE cis-element. The current results are a foundation for making use of this stress tolerance gene in future H. compressa studies.

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