Figure 4.

FR‐enriched light affects hormone levels in the Geranium pyrenaicum petiole, but not in the lamina, nor G. robertianum. Free indole‐3‐acetic acid (IAA), brassinolide (BL), and gibberellin A₁ (GA ₁) levels (pg/mg fresh weight) in G. pyrenaicum and G. robertianum petioles (plain bars) and lamina (striped bars) exposed to 2 or 11.5 hr of control white light (WL; R:FR 1.8) or WL supplemented with far‐red light (WL + FR; R:FR 0.2). Data represent means ± SEM, n = 3 biological replicates. Asterisks represent significant differences in WL + FR compared to WL (Student's t test, p < 0.05). ND marks samples where no hormone was detected