Table 2.

Phenotypic scores measured during examination of exocarp under 200x magnification as well as macrostructure traits (indicated by ‘macro scale’) using images of whole fruit

Phenotypic Trait	Details
Max. dead cell	Maximum number of peridermal layers observed
Min. dead cell	Minimum number of peridermal layers observed
Cuticle %	Coverage of cuticle over fruit exocarp (0 to 100% scale)
Periderm depth	Mean number of peridermal layers
Trichome density (0:3)	0,1,2,3 scale; 0 no trichomes to 3 high density
Lignified trichome (0/1)	scored 0 (no lignin) or 1 (lignified)
Suberized trichomes (0/1)	scored 0 (no suberization) or 1 (suberized) trichomes
Cuticle thickness (0:3)	0,1,2,3 scale; score 0 (cuticle not present) to 3 (thickest cuticle)
Microcracking (0:3)	0,1,2,3 scale; score 0 (no microcracks) to 3 (extensive microcracking)
Periderm	Epidermal (0) or peridermal (1) phenotype (> 2 peridermal cell layers)
Russet %	Percentage of surface covered with periderm (macro scale)
Semi Russet	Partial russet ranging from 20 to 80% (1) or not semi russet (0) (macro scale)