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The Dual-Barrier Mechanism of Gibberellin in Alleviating Aluminium Toxicity: Cell Wall Immobilization and Casparian Strip Reinforcement.
Plant, Cell & Environment · · Journal Article
Yang, Deng + more
Abstract ↗AI summary
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Gibberellin (GA) signalling in tobacco roots is linked to reduced aluminium (Al) accumulation and improved root growth, with GA enhancing defence via two structural barriers.
- Why it matters: Aluminium toxicity in acidic soils limits crop productivity by inhibiting root growth and nutrient uptake, but the hormonal coordination of Al defence in tobacco was unclear.
- What they did: The study used exogenous GA, CRISPR/Cas9 NtGA3-ox1 mutants, GA biosynthesis inhibitors, transcriptomics, and biochemical assays to test how GA affects root cell walls and the Casparian strip.
- The result: GA promotes Al exclusion by increasing hemicellulose to sequester Al and by reinforcing the endodermal Casparian strip via upregulated CS-associated genes, with pharmacology showing early CS formation is critical.
The findingWhy it mattersWhat they didThe result
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