Plant Physiology

Plant physiology in cannabis breeding refers to the observable structural and biochemical traits that define how a cultivar grows and functions—including leaf morphology, internode spacing, resin production patterns, and root architecture. These traits are shaped by both genetics and environmental conditions, making them central to selection work in breeding programs. Understanding plant physiology helps breeders predict vigor, yield potential, pest resistance, and adaptation to specific growing systems. Breeders working in this category often track traits like photosynthetic efficiency, nutrient uptake profiles, and flowering time consistency across generations. Documentation of physiological markers—such as chlorophyll density, stomatal density, and cannabinoid/terpene synthesis rates—enables more informed cross-selection and phenotype stabilization.

Breeders select for specific physiological traits to optimize performance in target environments: high-altitude cultivars may favor efficient CO₂ utilization, while indoor-focused lines might prioritize compact structure and consistent maturation. Physiological markers also inform indirect selection for cannabinoid and terpene production potential, since biosynthetic capacity is tied to leaf tissu