Prohexadione calcium is a low-toxicity, residue-free green plant growth regulator widely used in gramineous crops (such as rice, wheat, and barley) to enhance lodging resistance and provide multiple benefits including increased yield and improved quality.
Prohexadione calcium's mechanism of action and characteristics:
1. Inhibition of gibberellin synthesis:By inhibiting the biosynthesis of gibberellins (especially GA₁) in plants, it controls excessive stem growth, shortens internodes, and strengthens stems, thus significantly improving lodging resistance.
2. Promotion of reproductive growth: While inhibiting vegetative growth, it does not inhibit gibberellin synthesis in grains and fruits, which is beneficial for increasing seed setting rate, thousand-grain weight, and yield.
3. Enhanced stress resistance: It improves crop resistance to diseases (such as rice false smut and leaf spot), drought, low temperatures, and herbicide damage.
4. Environmentally friendly:Short half-life (<24 hours in soil), its metabolites are carbon dioxide and water, and it has no effect on subsequent crops.
