An Indole-3-Acetic Acid-Amido Synthetase, GmGH3.2, Negatively Regulates Salt Tolerance in Soybean.

Interfering with GmGH3.2, an indole-3-acetic acid-amido synthetase at qSTG2-1, significantly enhances salt tolerance in soybean hairy roots, increasing multiple root growth metrics under salt stress.

• Why it matters: Soil salinization limits soybean growth, so identifying salt-tolerance genes and how they are regulated is important for breeding improved, salt-tolerant cultivars.
• What they did: A GWAS across four environments identified 7 QTLs linked to salt-tolerance traits, and functional tests in soybean hairy roots showed that GmGH3.2 knockdown increased total root length, surface area, volume, and tip number, while overexpression inhibited root growth under salt stress.
• The result: GmGH3.2 is linked to reduced salt tolerance by affecting K+-Na+ homeostasis and the expression of GmSOS1, GmNHX1, GmSALT3, GmAKT1, GmHKT1, and GmSKOR, and it interacts with GmKH1 in the nucleus.

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