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Transcriptome and phytohormone changes associated with ethylene-induced onion bulb dormancy.

M Carmen Alamar1, Maria Anastasiadi1, Rosa Lopez-Cobollo2

  • 1Cranfield University, Bedfordshire, MK43 0AL, UK.

Postharvest Biology and Technology
|October 5, 2020
PubMed
Summary
This summary is machine-generated.

Ethylene treatment delays onion bulb sprouting by altering hormone levels and gene expression. This research clarifies ethylene

Keywords:
Abscisic acidAllium cepaCytokininEthylene supplementationGene expressionSprout elongation

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Area of Science:

  • Plant Physiology
  • Postharvest Biology
  • Molecular Biology

Background:

  • Controlling onion bulb dormancy and sprouting is crucial for postharvest management.
  • The exact mechanisms by which ethylene influences onion dormancy remain unclear.
  • Onion sprout leaves emerge from the bulb baseplate, making this tissue key for study.

Purpose of the Study:

  • To investigate the impact of ethylene treatment and storage duration on hormone profiles.
  • To analyze the transcriptome of onion bulb baseplates under ethylene treatment.
  • To elucidate the molecular mechanisms underlying ethylene's effect on onion dormancy.

Main Methods:

  • Collected and sequenced RNA from onion bulb baseplates over two years.
  • Performed de novo transcriptome assembly and annotation to identify unigenes.
  • Analyzed differential gene expression and Gene Ontology enrichment.
  • Quantified endogenous hormone levels (ethylene, abscisic acid, cytokinins).

Main Results:

  • Ethylene application delayed dormancy break and reduced sprout vigor.
  • Ethylene treatment increased endogenous ethylene, respiration, and abscisic acid (ABA) levels.
  • Differential expression of genes involved in ethylene, ABA, and cytokinin biosynthesis was observed.
  • Specific genes like ACO, EIN4, EIL3, NCED, LOG, and CKX were modulated by ethylene.

Conclusions:

  • Ethylene significantly alters the expression of multiple phytohormone-related genes in onion.
  • These hormonal and transcriptomic changes likely contribute to ethylene's dormancy-extending effects.
  • The study provides molecular insights into postharvest dormancy regulation in onions.