Product name: Paclobutrazol

CAS No.: 76738-62-0

CIPAC：445

Structural formula:

Molecular formula: C₁₅H₂₀N₃OCl
Relative molecular weight: 293.5 (based on 1997 international relative atomic mass)
Product specifications: ≥ 95%
Available for packaging: 25kg bag or 40kg barrel
Physical and chemical properties: White crystalline solid, melting point 165-166 ℃, vapor pressure 0.001mPa (20 ℃), density 1.22g/ml, KowlogP=3.2, solubility water 26mg/L (20 ℃), acetone 110, cyclohexanone 180, dichloromethane 100, hexane 10, xylene 60, methanol 150, propylene glycol 50 (g/L, 20 ℃), stored at 20 ℃ for more than 2 years and above 50 ℃ for 6 months, pH 4-9 does not hydrolyze and does not decompose under ultraviolet light (pH 7, 10 days), melting point: 165 ℃~166 ℃
Characteristics of action: It is a triazole plant growth regulator developed in the 1980s and an inhibitor of endogenous gibberellin synthesis. It can also increase the activity of indole-3-acetic acid oxidase in rice and reduce the level of endogenous IAA in rice seedlings. Significantly weaken the growth advantage at the top of rice seedlings and promote the proliferation of lateral buds (tillers). The appearance of the seedlings is short, strong, and multi tillering, with dark green leaves. The root system is well-developed. Anatomical studies have shown that paclobutrazol can reduce the cells in the roots, leaf sheaths, and leaves of rice seedlings, and increase the number of cell layers in each organ. Tracer analysis shows that rice seeds, leaves, and roots can all absorb paclobutrazol. Most of the paclobutrazol absorbed by the leaves remains in the absorption part and is rarely transported outward. Low concentrations of paclobutrazol enhance the photosynthetic efficiency of rice seedling leaves; High concentration suppresses photosynthetic efficiency. Improve root respiration intensity; Reduce aboveground respiration intensity, improve stomatal resistance of leaves, and reduce leaf transpiration. The agricultural application value of paclobutrazol lies in its control effect on crop growth.