4.7 Article

Isolation and characterization of two Medicago falcate AP2/EREBP family transcription factor cDNA, MfDREB1 and MfDREB1s

Journal

PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 48, Issue 12, Pages 971-976

Publisher

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2010.08.009

Keywords

Medicago falcate; Transcription factor; DREB; Cold tolerance

Categories

Funding

  1. National Natural Science Foundation of China [30460058]
  2. National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China [J0730648]

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DREB transcription factors play an important role in tolerance to abiotic stress in high plants. In this work, two new DRE-binding protein genes MfDREB1 and MfDREB1s cDNA that encoded an AP2/EREBP type transcription factor were isolated by RT-PCR from Medicago falcate seedlings. Sequence analysis showed MfDREB1 and MfDREB1s were almost identical except that there was a 202 bp fragment at the 3' end of the MIDREB1s cDNA that is absent in MfDREB1 cDNA. The MfDREB1 has a open reading frame of 651 bp, which encodes 216 amino acid residues. The putative protein is deduced a predicted molecular mass of 24.6 kDa and a pl of 5.95. The MfDREB1s has a open reading frame of 555 bp, the putative protein is 184 amino acid long with a predicted molecular weight of 20.8 kDa, pl 9.11. The Protein Blast data revealed that the two proteins can be classified as a typical member of the AP2/EREBP family of DNA-binding proteins. The comparison of the MfDREB1 cDNA and MfDREB1s cDNA with their corresponding genes in genomic DNA showed that the size and nucleotide sequence of the cDNA was identical to that of the genomic DNA. This suggested that the genomic MfDREB1 gene and MIDREB1s gene had no introns. Southern blot analysis indicated that MfDREB1 and MIDREB1s are multi-copy genes in Medicago falcate genome. Northern blot analysis indicated that the MfDREB1 and MfDREB1s genes were induced by low temperature stress. (C) 2010 Elsevier Masson SAS. All rights reserved.

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