Morphological measurements
Current-year shoot length (cm) was measured from the bud scar that
developed at bud break to the apical meristem for three shoots on each
of two trees (N=3). Trunk diameter was measured 10 cm above the graft
union twice perpendicular from one another prior to bud break and then
once in September. Mean trunk diameter was used to calculate trunk
cross-sectional area (TCSA).