mechanism of action of Uniconazole in wheat
Uniconazole is a highly effective plant growth regulator and belongs to the triazole plant growth retardant. It effectively blocks the production of gibberellins in plants by inhibiting the activity of kaurene oxidase, a key enzyme in the biosynthesis of gibberellins. This mechanism of action inhibits the elongation of wheat internode cells, which is manifested as morphological changes such as dwarfing of plants, sturdy stems, and thickened leaves. At the same time, Uniconazole can also promote root development, increase leaf chlorophyll content, enhance photosynthetic efficiency, and induce plants to produce stress resistance-related proteins, significantly improving wheat's tolerance to abiotic stresses such as drought and low temperature.
The effect of Uniconazole in the jointing stage of wheat
Using Uniconazole in the jointing stage of wheat can significantly reduce plant height, increase stem thickness, and effectively prevent lodging in the later stage. Specifically, the rational application of Uniconazole at the early stage of jointing (when the first internode at the base is 1-2 cm long) can reduce plant height by 10-15 cm and increase stem thickness by 0.5-1.2 mm. Field trials at the Institute of Crop Science, Chinese Academy of Agricultural Sciences showed that spraying 5% Uniconazole WP at 300-450g/hm² at the early stage of jointing can reduce plant height by 10-15 cm and increase stem thickness by 0.5-1.2 mm, effectively preventing lodging in the later stage. In addition, comparative tests at the Jiangsu Agricultural Technology Extension Station confirmed that this technology can increase wheat yield by 8-12%, especially in years with more rain.
