Fig. 1.

a Different sections of an excised leafy cutting of P. hybrida collected for IAA analysis. b IAA concentrations and c IAA contents in leaves (L) of different positions. d Relationship between leaf fresh mass and IAA concentration. SA shoot apex including smallest enclosing leaves; SM medium shoot position (1.5–2.5 cm from the basal end); SB stem base (0–0.5 cm). Mean and SE from five individual cuttings, columns which do not share a common letter are significantly different (P ≤ 0.05, Kruskal–Wallis test, n = 5). log log⁻¹ plot of IAA concentrations versus leaf mass of 20 individual leaves (L1–L4) from five individual cuttings