Characterization of a ripening-related transcription factor FcNAC1 from Fragaria chiloensis fruit

Sci Rep. 2018 Jul 12;8(1):10524. doi: 10.1038/s41598-018-28226-y.

Abstract

Fragaria chiloensis is a strawberry endemic from Chile with attractive white-pink fruit, pleasant aroma and taste. However, this fruit has a limited post-harvest period due to fast softening. Several transcription factors (TFs) are involved in the regulation of fruit ripening, and members of the NAC family have been implicated in cell wall remodeling. FcNAC1 was isolated from F. chiloensis fruit, coding a protein of 332 amino acid residues and displaying a characteristic NAC domain at the N terminus. FcNAC1 protein showed nuclear localization. An increase in transcript level was observed during ripening. A sequence of 1488 bp of FcNAC1 promoter was obtained. In silico analysis identified cis elements able to respond to some hormones and Secondary wall NAC binding elements (SNBE), and responding to auxin and ABA. A structural model of FcNAC1 provided evidence for interaction with DNA sequences containing SNBE, while a dual luciferase assay confirmed the transcriptional activation by FcNAC1 of the promoter of FcPL, a gene involved in cell wall remodeling in F. chiloensis fruit. The results suggest the participation of FcNAC1 during ripening development of strawberry fruit, by regulating pectin metabolism during softening.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abscisic Acid / metabolism
  • Cell Wall / metabolism
  • Chile
  • Cloning, Molecular
  • DNA, Plant / chemistry
  • DNA, Plant / metabolism
  • DNA-Binding Proteins / chemistry
  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / isolation & purification
  • DNA-Binding Proteins / metabolism*
  • Fragaria / physiology*
  • Fruit / cytology
  • Fruit / metabolism
  • Gene Expression Regulation, Plant / physiology
  • Indoleacetic Acids / metabolism
  • Molecular Dynamics Simulation
  • Plant Proteins / chemistry
  • Plant Proteins / genetics
  • Plant Proteins / isolation & purification
  • Plant Proteins / metabolism*
  • Promoter Regions, Genetic / genetics
  • Protein Interaction Domains and Motifs
  • Transcription Factors / chemistry
  • Transcription Factors / genetics
  • Transcription Factors / isolation & purification
  • Transcription Factors / metabolism*

Substances

  • DNA, Plant
  • DNA-Binding Proteins
  • Indoleacetic Acids
  • Plant Proteins
  • Transcription Factors
  • Abscisic Acid