Paclobutrazol

The pure product is a white crystalline solid. m.p.165 ～ 166 ℃ , relative density 1.22, the pure product is stable within 6 months at 50℃ , the aqueous solution is stable at room temperature for more than 30d, relatively stable to ultraviolet light.

Paclobutrazol is a new type of plant growth regulator, which can inhibit the production of gibberellin derivatives and reduce the division and elongation of plant cells.

Definition:

Paclobutrazol is a plant growth regulator (PGR) belonging to the triazole class. It is primarily used to inhibit the biosynthesis of gibberellins, a group of plant hormones that promote growth. By reducing gibberellin production, paclobutrazol effectively controls plant height, promotes branching, and improves stress tolerance in plants. It is widely used in horticulture, agriculture, and turf management to manage plant growth and enhance overall plant health.

Mechanism of Action:

Paclobutrazol works by inhibiting the biosynthesis of gibberellins, which are key hormones responsible for plant cell elongation. When gibberellin production is reduced, plants experience restricted vertical growth and increased lateral growth, resulting in shorter, more compact plants with enhanced branching. This growth regulation is particularly beneficial for ornamental plants, turfgrass, and certain crops.

Applications:

1. Growth Regulation in Ornamental Plants:
   Paclobutrazol is widely used in ornamental horticulture to control the height and shape of plants. It helps prevent excessive growth, ensuring that plants remain compact and aesthetically pleasing. It is commonly applied to flowers, shrubs, and trees in nurseries and garden centers.

2. Turfgrass Management:
   In turfgrass management, paclobutrazol is used to reduce the need for frequent mowing by slowing vertical growth. It helps maintain a dense and uniform turf, improving the appearance and health of lawns, golf courses, and sports fields.

3. Crop Management:
   Paclobutrazol is used to control the growth of various crops, including fruits and vegetables, by promoting compact growth and reducing lodging (the bending or falling over of plants). This can lead to improved yields and easier harvesting.

4. Flowering and Fruit Set:
   In some crops, paclobutrazol is used to promote flowering and fruit set by reducing excessive vegetative growth. This results in better resource allocation to reproductive growth, leading to higher yields and improved fruit quality.

Benefits and Effects:

• Height Control and Compact Growth:
  Paclobutrazol effectively controls plant height, making it ideal for managing the growth of ornamental plants and crops that require a more compact form.

• Increased Branching and Improved Shape:
  By promoting lateral growth, paclobutrazol enhances the branching of plants, improving their overall shape and structure.

• Improved Stress Tolerance:
  Plants treated with paclobutrazol often exhibit increased resistance to environmental stresses such as drought, heat, and disease. This makes it a valuable tool for improving plant survival in challenging conditions.

• Reduced Need for Maintenance:
  In turfgrass and ornamental horticulture, paclobutrazol reduces the need for frequent trimming and mowing, saving time and labor.

• Enhanced Yield and Quality in Crops:
  By controlling excessive vegetative growth, paclobutrazol can improve the quality and yield of certain crops, making it a useful tool in agriculture.

Safety and Environmental Impact:

• Toxicity:
  Paclobutrazol is considered to have low toxicity to humans and animals when used according to recommended guidelines. However, it should be handled with care to avoid skin or eye irritation.

• Environmental Impact:
  Paclobutrazol is relatively stable in the environment but should be used responsibly to prevent contamination of water sources. It is biodegradable and has minimal long-term environmental impact when applied correctly.

Handling and Storage:

• Storage Conditions:
  Paclobutrazol should be stored in a cool, dry place, away from direct sunlight and heat. It should be kept in tightly sealed containers to prevent degradation and contamination.

• Safety Precautions:

  • Wear protective gloves, eyewear, and clothing when handling paclobutrazol.

  • Avoid inhaling dust or mist from paclobutrazol solutions.

  • Keep out of reach of children and animals.

Conclusion:

Paclobutrazol is a highly effective plant growth regulator that provides valuable control over plant height, shape, and growth. Its ability to promote compact growth, improve branching, and enhance stress tolerance makes it an essential tool in horticulture, agriculture, and turf management. With its low toxicity and minimal environmental impact, paclobutrazol is a safe and efficient option for improving plant health and productivity.