Transmembrane Protein GbTMEM209 Inhibits Fibre Elongation via Competitive Interaction With GbHOX3 in Gossypium
Kaiyun Jiang1,2, Nan Zhao1, Jie Kong3
1Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education/College of Agronomy and Biotechnology, China Agricultural University, Beijing, China.
Plant Biotechnology Journal
|January 21, 2026
Summary
Researchers identified two SNPs in the TRANSMEMBRANE PROTEIN 209 (TMEM209) gene linked to Sea Island cotton fibre length. Modifying GbTMEM209 levels impacts fibre development, revealing a new regulatory mechanism for cotton fibre morphogenesis.
Area of Science:
- Plant Genetics and Genomics
- Molecular Biology
- Agricultural Science
Background:
- Sea Island cotton (Gossypium barbadense) is prized for premium fibre quality, but the genetic underpinnings of its fibre development are not fully understood.
- Understanding the genetic regulation of cotton fibre elongation is crucial for improving fibre yield and quality through molecular breeding.
Purpose of the Study:
- To identify genetic factors influencing fibre length in Sea Island cotton.
- To elucidate the molecular mechanism by which GbTMEM209 regulates cotton fibre development.
- To explore potential genetic targets for enhancing cotton fibre quality.
Main Methods:
- Identification of single nucleotide polymorphisms (SNPs) in the Gbar_D13G024080 gene encoding TMEM209.
- CRISPR-Cas9 gene editing to knockout GbTMEM209 and assess its effects on fibre traits.
- Overexpression studies of GbTMEM209 in Gossypium hirsutum.
- Investigating protein-protein interactions between GbTMEM209 and GbHOX3 using mechanistic assays.
- Virus-induced gene silencing (VIGS) to validate the roles of GbHOX3, GbEXPA1, and GbRDL1.
Main Results:
- Two non-synonymous SNPs in GbTMEM209, causing amino acid changes, significantly correlate with increased fibre length in Sea Island cotton.
- GbTMEM209 knockout enhances fibre length and strength, while its overexpression reduces fibre length.
- GbTMEM209 negatively regulates fibre elongation by competitively interacting with GbHOX3, thereby inhibiting the transcription of cell wall-loosening genes (GbEXPA1, GbRDL1).
Conclusions:
- GbTMEM209 acts as a novel negative regulator of cotton fibre elongation.
- A protein competition mechanism involving GbTMEM209 and GbHOX3 controls cotton fibre morphogenesis.
- These findings offer valuable genetic targets for improving cotton fibre quality in breeding programs.
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