What Are The 5 Major Plant Hormones?
What Are The 5 Major Plant Hormones? There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA). For the most part, each group contains both naturally occurring hormones and synthetic substances. What are the five classical plant hormones? Since 1937, gibberellin (GA), ethylene, cytokinin, and ab- scisic acid (ABA)