iTRAQ-based quantitative proteomic analysis reveals dynamic changes during daylily flower senescence.

Area of Science:

• Plant Biology
• Molecular Biology
• Proteomics

Background:

• Daylily flowers have a lifespan of less than 24 hours, opening at dawn and withering by night.
• While physiological and genetic responses to daylily flower senescence are known, the underlying metabolic pathways and proteins remain poorly understood.

Purpose of the Study:

• To identify key metabolic pathways and proteins involved in daylily flower senescence.
• To understand the molecular mechanisms regulating the ephemeral nature of daylily flowers.

Main Methods:

• Utilized iTRAQ-based quantitative proteomic methods to analyze proteomes across four developmental stages of daylily flowers.
• Performed Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), and Clusters of Orthologous Groups (COG) analyses for protein function and classification.
• Conducted hierarchical cluster and functional enrichment analyses on differentially expressed proteins.

Main Results:

• Identified 445 proteins in total, with numerous differentially expressed proteins detected between developmental stages.
• Found that sugar metabolic process (GO) and sugar metabolism pathways (KEGG) were the most enriched categories when comparing late to early stages.
• Highlighted the potential roles of invertase, protease, and ribosomal proteins in regulating daylily flower senescence.

Conclusions:

• Sugar-related metabolic processes and pathways are critical regulators of daylily flower circadian rhythm and ephemeral properties.
• Invertase, protease, and ribosomal proteins are potential key players in the senescence mechanism of daylily flowers.
• This research provides novel insights into the senescence mechanisms of ephemeral flowers.