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Transcriptomic and Metabolomic Analyses Reveal Differences in Flavonoid Pathway Gene Expression Profiles between Two

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Summary

This study investigated flavonoid biosynthesis in Dendrobium orchids during vernalization. Putrescine hydroxycinnamoyl transferase 1 was identified as a key gene associated with yellow flower color.

Keywords:
Dendrobium capillipesDendrobium nobileflavone and flavonol biosynthesisflavonoid biosynthesismetabolometranscriptomevernalization

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Area of Science:

  • Plant Science
  • Molecular Biology
  • Biochemistry

Background:

  • Dendrobium orchids exhibit diverse, long-lasting flower colors, primarily influenced by flavonol and flavone pathways.
  • The molecular mechanisms of flavonoid biosynthesis during vernalization in Dendrobium remain largely unelucidated.

Purpose of the Study:

  • To investigate the similarities and differences in flavonoid biosynthesis across various tissues during vernalization in two Dendrobium species.
  • To identify key genes and metabolites regulating flower color variation in Dendrobium during vernalization.

Main Methods:

  • Comparative analysis of metabolic profiling and transcriptome sequencing data from six tissue types of Dendrobium capillipes (yellow flowers) and Dendrobium nobile (white flowers) during vernalization.
  • Identification and analysis of differentially expressed genes (DEGs) and differentially accumulated metabolites (DAMs).

Main Results:

  • 31,504 DEGs were identified between the two Dendrobium species.
  • DEGs and DAMs were significantly enriched in flavonoid biosynthesis pathways, particularly flavone and flavonol biosynthesis subpathways.
  • Putrescine hydroxycinnamoyl transferase 1 (LOC110093422) was identified as a potential key gene regulating flavonoid accumulation and yellow flower color.

Conclusions:

  • The study provides preliminary insights into the metabolites and key genes governing flavonoid biosynthesis during vernalization in Dendrobium.
  • The findings lay the groundwork for further research into the molecular mechanisms of flavonoid synthesis and flower color determination in orchids.