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) |