Large seed size accompanying GmSDP1 suppression is linked to cellular remodeling and phytohormone regulation

Seed-specific suppression of SDP1 in soybean (Glycine max) is linked to an 18–25% increase in seed size, alongside larger seed cells and stronger lignocellulosic cell wall accumulation.

• Why it matters: The work addresses how carbon partitioning changes during seed development translate into improved seed yield and quality, filling a gap in the developmental mechanism behind SDP1-driven oil and size effects.
• What they did: Using microscopy, biochemical assays, and temporal biochemical plus transcriptomic profiling in SDP1-suppressed seeds, the study measured cell size, lignocellulosic wall buildup, hormone homeostasis (abscisic acid, 12-oxo-phytodienoic acid, jasmonoyl-isoleucine), and expression of F-box and RING/U-box genes.
• The result: The increased seed size phenotype is associated with coordinated remodeling of cellular development, cell wall accumulation, and phytohormone regulation, supporting SDP1 manipulation as a potential strategy for soybean seed yield and quality improvement.

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