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Transcriptomic Analysis in Strawberry Fruits Reveals Active Auxin Biosynthesis and Signaling in the Ripe Receptacle.

Elizabeth Estrada-Johnson1, Fabiana Csukasi1, Carmen M Pizarro1

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This study reveals auxin

Keywords:
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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Auxin's role in strawberry fruit development was previously limited to early stages.
  • Later ripening stages involve other hormones like gibberellins, abscisic acid, and ethylene.
  • The specific involvement of auxin in late-stage strawberry receptacle ripening remained unclear.

Purpose of the Study:

  • To investigate the role of auxin in the late stages of strawberry fruit ripening.
  • To identify auxin-related genes involved in receptacle development and ripening.
  • To elucidate the molecular mechanisms of auxin action during strawberry fruit ripening.

Main Methods:

  • Transcriptome analysis of ripening strawberry fruit.
  • Gene expression analysis of auxin synthesis, perception, signaling, and transport genes.
  • Transient gene silencing and reporter gene assays (DR5-GUS) in transgenic strawberry plants.

Main Results:

  • Auxin content in the receptacle remains constant during ripening.
  • Specific auxin synthesis genes (FaTAA1, FaTAR2) and signaling components (FaAux/IAA, FaARF) are actively transcribed in ripe receptacles.
  • Silencing FaTAR2 reduced auxin responsiveness, and FaARF6a is a strong candidate for involvement in receptacle cell elongation.

Conclusions:

  • Auxin plays a significant role in the late stages of strawberry receptacle ripening, beyond its known early developmental functions.
  • Key auxin-related genes are dynamically regulated during ripening, suggesting complex molecular interactions.
  • FaARF6a is hypothesized to be involved in receptacle cell elongation during strawberry fruit growth and ripening.