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<p>The “Guanxi” pummelo is a commercially important citrus cultivar with high fruit quality. Here, the first integrated analysis of a pummelo peel chimera, based on a naturally occurring yellow-green pericarp mutant of “Guanxi” pummelo, was reported. The molecular mechanisms underlying this chimerism were investigated through phenotypic characterization, pigment content measurement, and RNA-Seq analysis. Results revealed significant differences in chlorophyll and carotenoid contents between the green and yellow peel regions. RNA-Seq identified 1594 differentially expressed genes (DEGs), many of which are involved in chlorophyll metabolism and carotenoid biosynthesis. Key genes involved in chlorophyll degradation, such as <i>SGR</i>, were upregulated in the yellow peel, while carotenoid biosynthesis genes, including <i>DXS</i> and <i>PSY</i>, were also upregulated, indicating coordinated regulation of pigment metabolism. Functional enrichment analyses highlighted pathways related to chlorophyll metabolism, carotenoid biosynthesis, and photosynthesis-related processes, providing insights into the regulatory network of peel color formation. These findings provide insights into the molecular mechanisms underlying peel color variation in citrus chimeras and identify candidate genes for the genetic improvement of fruit coloration traits.</p>

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Transcriptomic and Pigment Analysis Reveal Peel Color Regulation in a Yellow-Green Chimera Mutant of “Guanxi” Pummelo (Citrus grandis)

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Yuan Xue,
  • Donghuang Zhu,
  • Lingjun Ke,
  • Huiwen Yu

摘要

The “Guanxi” pummelo is a commercially important citrus cultivar with high fruit quality. Here, the first integrated analysis of a pummelo peel chimera, based on a naturally occurring yellow-green pericarp mutant of “Guanxi” pummelo, was reported. The molecular mechanisms underlying this chimerism were investigated through phenotypic characterization, pigment content measurement, and RNA-Seq analysis. Results revealed significant differences in chlorophyll and carotenoid contents between the green and yellow peel regions. RNA-Seq identified 1594 differentially expressed genes (DEGs), many of which are involved in chlorophyll metabolism and carotenoid biosynthesis. Key genes involved in chlorophyll degradation, such as SGR, were upregulated in the yellow peel, while carotenoid biosynthesis genes, including DXS and PSY, were also upregulated, indicating coordinated regulation of pigment metabolism. Functional enrichment analyses highlighted pathways related to chlorophyll metabolism, carotenoid biosynthesis, and photosynthesis-related processes, providing insights into the regulatory network of peel color formation. These findings provide insights into the molecular mechanisms underlying peel color variation in citrus chimeras and identify candidate genes for the genetic improvement of fruit coloration traits.