Auxin Cytokinin Ratios

Auxin-cytokinin ratios represent a foundational plant physiology concept in cannabis breeding, describing the balance between two key plant hormones that regulate growth patterns. High auxin-to-cytokinin ratios are commonly associated with root development and apical dominance, while lower ratios often correlate with shoot branching and lateral growth. Breeders manipulating these ratios indirectly through selective breeding can influence plant architecture—affecting branching density, internode spacing, and overall structure. This hormonal balance is regulated by genetic factors and environmental conditions, making it relevant to phenotype expression across generations. Understanding auxin-cytokinin dynamics helps breeders predict how offspring may develop under specific cultivation conditions.

Cannabis breeders track morphological traits linked to auxin-cytokinin balance when selecting for compact, bushy phenotypes versus tall, apical-dominant structures. Lineage records frequently note how certain cultivars maintain consistent branching patterns across generations, suggesting stable hormonal regulation inherited from parent genetics.