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Related Experiment Video

Updated: Sep 11, 2025

Isolation and Biophysical Study of Fruit Cuticles
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Histological and Transcriptomic Insights into Rugose Surface Formation in Pepper (Capsicum annuum L.) Fruit.

Yiqi Xie1,2, Haizhou Zhang1,2, Chengshuang Li1,2

  • 1Department of Vegetable Science, College of Horticulture, China Agricultural University, Beijing 100193, China.

Plants (Basel, Switzerland)
|August 14, 2025
PubMed
Summary

Pepper fruit rugosity, a trait linked to texture, arises from disorganized epidermal cells. This study reveals key genes in microtubule and hormone pathways driving this trait, offering targets for breeding better pepper varieties.

Keywords:
comparative transcriptome analysisepidermal morphologyfruit surface rugosityfruit texturepepper

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Area of Science:

  • Plant science
  • Genetics
  • Agricultural science

Background:

  • The rugose surface trait in pepper (Capsicum annuum L.) influences fruit texture.
  • Understanding the genetic and molecular basis of rugosity is crucial for pepper breeding.

Purpose of the Study:

  • To investigate the histological, textural, and transcriptomic underpinnings of the rugose surface trait in pepper.
  • To identify key genes and pathways regulating fruit surface morphology and texture.

Main Methods:

  • Histological analysis to observe epidermal cell organization and morphological changes.
  • Development of a computer-aided design (CAD)-based rugosity index (RI) correlated with sensory evaluation.
  • Texture analysis to assess physical properties like rupture force and hardness.
  • Comparative transcriptome profiling to identify differentially expressed genes (DEGs).

Main Results:

  • Rugosity is associated with disorganized epidermal cell layers, evident around 10 days post-anthesis.
  • A validated RI strongly correlated with sensory rugosity scores (R² = 0.659).
  • Increased rugosity correlated with reduced hardness, lower rupture force, and higher pectinase activity.
  • Ten DEGs involved in microtubule dynamics and phytohormone signaling were identified with specific expression patterns.

Conclusions:

  • Cytoskeletal remodeling and hormonal regulation are key drivers of epidermal disorganization and surface rugosity in pepper fruits.
  • The identified genes provide potential targets for breeding pepper cultivars with desirable surface morphology and texture.
  • This research offers novel insights into the molecular mechanisms governing fruit surface development.