Heat Stress Physiology

Heat stress physiology refers to how cannabis plants respond metabolically and structurally when exposed to temperatures above their optimal growing range (typically above 28–30°C). Under heat stress, plants may exhibit altered terpene profiles, reduced resin production, leaf bleaching, or wilting as protective mechanisms. Breeders studying heat stress physiology aim to identify genetic traits associated with temperature resilience, including enhanced antioxidant production and stomatal regulation. Understanding these physiological responses helps inform cultivation decisions and informs selection of parentage for heat-tolerant breeding lines. Heat stress responses are influenced by both genetics and environment, making field trials and controlled studies essential for reliable assessment.

Breeders working in hot climates or designing for climate variability prioritize heat stress tolerance by selecting plants that maintain vigor, terpene stability, and resin output under elevated temperatures. Heat stress physiology traits are often combined with drought tolerance and UV resilience in breeding programs targeting outdoor or semi-controlled environments.