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<p>Exploiting mechanical picking of fresh leaves is an urgent task in the tea industry. The internode length of new shoots is one of the key traits determining the suitability of tea plants for mechanical picking. In this study, we explored the mechanisms regulating tea internode elongation through transcriptome sequencing and endogenous hormone analysis in two cultivars with different internode length. The results indicated that internode elongation is associated with the increased parenchyma cell diameter in the internode. One <i>CsDELLA</i> gene (<i>CsDELLA2</i>), three <i>CsMYC</i> transcription factors (TFs) (<i>CsMYC1.2</i>, <i>CsMYC1.3</i>, and <i>CsAMS.2</i>), two <i>CsJAZ</i> TFs (<i>CsJAZ1</i> and <i>CsJAZ3</i>), and three secondary cell wall-related genes (<i>CsEXP1</i>, <i>CsCESA1</i> and <i>CsXTH1</i>) have been identified as potential candidate genes. These results provide candidate genes for obtaining tea plants with longer internodes which are suitable for mechanical harvesting.</p>

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Transcriptome and Phytohormone Analysis Reveal the Regulatory Mechanism of Internode Elongation in New Shoots of Tea Plants (Camellia sinensis)

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Liping Zhang,
  • Hong Shen,
  • Shuixing Zhu,
  • Yihu Mao,
  • Yang Li,
  • Haoyang Liu,
  • Hongxin Jiang,
  • Ahmed Salem Mohamed,
  • Peiqiang Wang,
  • Xin Li

摘要

Exploiting mechanical picking of fresh leaves is an urgent task in the tea industry. The internode length of new shoots is one of the key traits determining the suitability of tea plants for mechanical picking. In this study, we explored the mechanisms regulating tea internode elongation through transcriptome sequencing and endogenous hormone analysis in two cultivars with different internode length. The results indicated that internode elongation is associated with the increased parenchyma cell diameter in the internode. One CsDELLA gene (CsDELLA2), three CsMYC transcription factors (TFs) (CsMYC1.2, CsMYC1.3, and CsAMS.2), two CsJAZ TFs (CsJAZ1 and CsJAZ3), and three secondary cell wall-related genes (CsEXP1, CsCESA1 and CsXTH1) have been identified as potential candidate genes. These results provide candidate genes for obtaining tea plants with longer internodes which are suitable for mechanical harvesting.