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Relief of GbDEAH12G repression on the GbNAC072C-GbHOX3 axis improves lint percentage in Gossypium barbadense

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月12日

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  • Bin Li,
  • Nan Zhao,
  • Kaiyun Jiang,
  • Jie Kong,
  • Meng Wang,
  • Baoliang Wang,
  • Weiran Wang,
  • Suen Liu,
  • Huijing Li,
  • Zhuanxia Pan,
  • Jiahui Zhu,
  • Junyi Geng,
  • Beibei Lv,
  • Zhanghao Xia,
  • Alifu Aierxi,
  • Jingrou Zhang,
  • Baosheng Guo,
  • Pengbo Li,
  • Daojun Yuan,
  • Anhui Guo,
  • Jinping Hua

摘要

Improving lint percentage (LP) is a key breeding target for Sea Island cotton (Gossypium barbadense), yet its genetic basis remains poorly understood. Here, we identify GbNAC072C as a positive regulator of LP that promotes fiber cell protrusions by directly activating the transcription of GbHOX3. We find that GbNAC072C is inhibited by GbDEAH12G, and crucially, the strength of this interaction is haplotype-dependent. The GbDEAH12G protein binds GbNAC072C with higher affinity than the GbDEAH12C variant, leading to stronger suppression of GbHOX3 activation and consequently lower LP. This explains why the GbDEAH12C-GbNAC072C allele combination gives improved LP. Our work elucidates how haplotype-specific protein interactions modulate a key transcriptional cascade and proposes a disinhibition strategy for breaking yield limits in Sea Island cotton breeding.