Uncovering the Central Role of GhSPL13 in Vegetative Growth, Root Architecture, and Stress Responses in Cotton.
Sadaqat S, Awais M, Saad Bin Tahir M, Ajmal R, Yasmeen A
Crispr
If you've ever watched a plant push out more roots after a dry spell, you're seeing a version of what this gene controls — and understanding that switch could help breed crops that survive water shortages without extra irrigation.
Researchers found a single gene in cotton that acts like a control dial for how the plant shapes itself and copes with drought. When they switched this gene off using precise gene-editing, the cotton plants grew more side branches, sprouted longer and heavier roots, and survived dry conditions far better than normal plants. The edited plants also ramped up production of flavonoids and anthocyanins — the same family of pigments that make blueberries blue and red cabbage red — suggesting this one gene touches a surprisingly wide range of plant chemistry.
Key Findings
CRISPR-edited cotton lacking GhSPL13 showed pronounced increases in root length and biomass, alongside enhanced axillary branching complexity compared to wild-type plants
Under drought stress, edited lines demonstrated elevated stomatal conductance, higher intercellular CO₂, enhanced photosynthetic rates, and greater total chlorophyll content relative to controls
Metabolomic profiling revealed substantial upregulation of flavonoid and anthocyanin biosynthesis pathways, with conserved SPL-binding motifs (GTAC) identified in the promoters of key biosynthetic genes including GhDFR
chevron_right Technical Summary
Scientists used CRISPR gene-editing to disable a master regulator gene (GhSPL13) in cotton plants, discovering it controls branching, root growth, and drought resilience. Plants without this gene grew bushier with longer roots and handled dry conditions significantly better — a potential roadmap for breeding tougher cotton.
Abstract Preview
SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) transcription factors constitute a conserved family of key regulators orchestrating plant growth and development, with well-documented roles in hormone ...
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