The following points highlight the five main types of plant growth regulators. The types are: 1. Auxins 2. Gibberellins 3. Cytokinins 4. Ethylene 5. Abscissic Acid. Plant Growth Regulators: Type # 1. Auxins: Auxins (GK Auxein = to grow), isolated initially from human urine were the first plant PGR to be discovered. However, IAA also […]