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Luis A Martínez-López, Neftalí Ochoa-Alejo, Octavio Martínez1

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Chili pepper fruit transcriptome changes significantly during development, with major shifts observed between 10-20 and 40-60 days after anthesis (DAA). The later stage shows decreased gene expression, indicating maturation and senescence.

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Area of Science:

  • Plant Molecular Biology
  • Transcriptomics
  • Fruit Development

Background:

  • The transcriptome, comprising all mRNA molecules in a cell, dynamically changes with cell type and developmental stimuli.
  • Understanding chili pepper fruit transcriptome changes during development and ripening is crucial for agricultural and biological insights.

Purpose of the Study:

  • To investigate the dynamic changes in the chili pepper fruit transcriptome during different developmental stages.
  • To identify key biological processes and metabolic pathways affected during fruit ripening.

Main Methods:

  • RNA-Sequencing (RNA-Seq) was employed to profile transcriptomes of chili pepper fruits at 10, 20, 40, and 60 days after anthesis (DAA).
  • De novo assembly of Illumina MiSeq reads yielded 34,066 chili genes.
  • Weighted gene expression analysis was used to interpret patterns in gene groups, Biological Process ontologies, and Metabolic Pathways.

Main Results:

  • Significant expression changes were detected in approximately 17% of genes, 63% of Biological Processes, and 80% of Metabolic Pathways across developmental stages.
  • Genes involved in capsaicinoid and ascorbic acid biosynthesis were upregulated at 20 DAA.
  • Carotenoid biosynthesis genes showed high expression from 40-60 DAA, with RNA-Seq data validated by qRT-PCR.

Conclusions:

  • Profound transcriptome alterations occurred between 10-20 DAA and 40-60 DAA, with the latter period dominated by decreased gene expression.
  • The 40-60 DAA interval signifies fruit maturation completion and the onset of senescence.
  • Chili pepper fruit transcriptomes exhibited the highest specialization and lowest diversity at 60 DAA.