Figure 2.

Stomatal conductance (Gs) as function of net photosynthesis (Pn) in 12 own-rooted grapevine rootstocks at and 20% soil water content (SWC). Colors are attributed according to the breeding materials (Table 1). M-rootstock pedigree: M1—K5BB × Teleki 5C; M3—K5BB × Teleki 5C; M4—unknown × 1103P. Thresholds for group identification were set to 50 mmol H₂O m⁻² s⁻¹ [47] for Gs and to the average for Pn at 20% SWC. The dotted line shows the average Gs value at 20% SWC.