Plant Growth Promoters (PGP)

Plant Growth Promoters (PGPs) are a subset of Plant Growth Regulators (PGRs) that stimulate and enhance various aspects of plant growth and development. These compounds, either naturally occurring or synthetic, promote activities such as cell division, elongation, flowering, fruit development, and root formation.

Key Types of Plant Growth Promoters

1. Auxins

   • Function: Promote cell elongation, root initiation, and apical dominance; help in vascular tissue differentiation.
   • Examples:
     • Natural: Indole-3-acetic acid (IAA).
     • Synthetic: Indole-3-butyric acid (IBA), Naphthaleneacetic acid (NAA).

2. Gibberellins (GAs)

   • Function: Stimulate stem elongation, seed germination, flowering, and fruit development.
   • Examples: Gibberellic acid (GA3).

3. Cytokinins

   • Function: Promote cell division and shoot initiation, delay leaf senescence, and improve nutrient mobilization.
   • Examples: Zeatin, Kinetin, Benzylaminopurine (BAP).

Characteristics of Plant Growth Promoters:

• Mode of Action: Act at low concentrations to enhance specific plant physiological processes.
• Functions:
  • Increase plant height and biomass.
  • Promote the formation of roots, shoots, flowers, and fruits.
  • Enhance nutrient uptake and photosynthetic efficiency.
  • Aid in overcoming dormancy in seeds and buds.