Strigolactone promotes cotton fiber cell elongation by de-repressing DWARF53 on linolenic acid biosynthesis.

Strigolactone (SL) is a plant hormone required for plant development. DWARF53 (D53) functions as a transcription repressor in SL signaling. However, the role of D53 in cotton (Gossypium hirsutum, Gh) fiber development remains unclear.

Promotes Fiber Cell Elongation and Cell Wall Thickness by Increasing PI and IP Accumulation in Cotton.

The omega-3 fatty acid desaturase enzyme gene is responsible for converting linoleic acid to linolenic acid in plant fatty acid synthesis. Despite limited knowledge of its role in cotton growth, our study focused on , a gene within the family, which was found to promote fiber elongation and cell wall thickness in cotton. was predominantly expressed in elongating fibers, and its suppression led to shorter fibers with reduced cell wall thickness and phosphoinositide (PI) and inositol triphosphate (IP) levels.