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Transcriptomic and Structural Insights into Leaf Variegation Development in Ilex × 'Solar Flare'.

Yiping Zou1,2,3, Tao Zhuo1, Yan Duan4

  • 1College of Forestry, Nanjing Forestry University, Nanjing 210037, China.

International Journal of Molecular Sciences
|May 14, 2025
PubMed
Summary

Leaf variegation in Ilex × 'Solar Flare' is caused by chloroplast abnormalities and impaired chlorophyll synthesis. Gene expression changes disrupt pigment production and chloroplast development, leading to the plant's unique yellow and green patterns.

Keywords:
chloroplast developmentleaf variegationphotosynthesispigment metabolismtranscriptome

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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Photosynthesis Research

Background:

  • Leaf variegation in ornamental plants like Ilex × 'Solar Flare' lacks detailed mechanistic understanding.
  • Understanding variegation can reveal insights into chloroplast development and pigment biosynthesis.

Purpose of the Study:

  • To elucidate the molecular and physiological mechanisms behind the leaf variegation in Ilex × 'Solar Flare'.
  • To characterize the structural and biochemical differences between green and yellow leaf sectors.

Main Methods:

  • Comparative analysis of chloroplast structure and pigment content in variegated leaves.
  • Transcriptome sequencing to identify differentially expressed genes (DEGs) between yellow and green sectors.
  • Analysis of gene expression related to chlorophyll biosynthesis, degradation, and chloroplast development.

Main Results:

  • Yellow sectors showed abnormal chloroplasts, reduced pigments (chlorophylls, carotenoids), and impaired photosynthesis.
  • Transcriptome analysis revealed significant DEGs, including altered expression of chlorophyll biosynthesis (CHLD, CHLH, CHLG) and degradation (PAO) genes.
  • Downregulation of GLK1, GLK2, and thylakoid-related genes (PsbC, PsbO, PsbR, PsaD, PsaH) was observed in yellow sectors, indicating defective chloroplast development.

Conclusions:

  • Altered gene expression in chlorophyll biosynthesis, degradation, and chloroplast development pathways underlies the variegation in Ilex × 'Solar Flare'.
  • These findings provide a molecular basis for the phenotypic characteristics of this ornamental cultivar.