Table I.

Assessment of responses of different potato lines to mechanical stress

CultivarBruise Index
Russet Burbank9.2
Saturna7.9
Cara5.5
King Edward4.0
Maris Piper3.1

Thirty tubers of each cultivar were exposed to a standard impact energy (0.7 J) and incubated at 28°C for 48 h. Tubers were quartered at the point of impact, and the extent of pigment synthesis was assessed. Indices were calculated according to the intensity of pigmentation and the volume of affected tissue. The results were expressed on a scale of 1 to 10.