One gene helps tobacco roots keep growing in salty soil
He F, Li C, Liu S, Jia Z, Zhu Z
Crop Improvement
If you've ever watered a container garden with tap water and noticed salt buildup stunting root growth, this gene points to why some plants recover and others don't.
Salty soil is one of the biggest threats to farming worldwide because it stops plant roots from growing properly. Researchers discovered a gene in tobacco called NtIAA17 that helps roots keep growing under salt stress by managing auxin, the hormone plants use to direct root growth, and by boosting the plant's antioxidant defenses. When they deleted this gene, plants struggled far more under salty conditions, showing it's a key piece of the plant's stress-survival toolkit.
Key Findings
Exogenous auxin application reversed salt-induced root growth inhibition in tobacco.
CRISPR-Cas9 knockout of NtIAA17 increased salt sensitivity, with reduced auxin accumulation and lower expression of auxin synthesis (NtYUCCAs) and transport (NtPINs) genes.
NtIAA17-knockout lines showed stunted root growth and compromised antioxidant capacity under salt stress compared to wild-type plants.
chevron_right Technical Summary
Scientists found a gene in tobacco plants that helps roots keep growing in salty soil by managing the plant hormone auxin. Boosting this gene's activity could help engineer crops that survive salty, degraded farmland.
Abstract Preview
Original paper
Auxin is involved in NtIAA17-mediated regulation of root development under salt stress in tobacco.
NtIAA17 acts as a positive regulator of salt tolerance in tobacco, which alleviates salt-repressed root growth by sustaining auxin homeostasis and antioxidant capacity. Across the globe, soil salin...
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