The red cells were randomly distributed in the epidermis and sub-epidermis of apple skin
(Table 4). The two cultivars in Maoxian had higher (P ≤ 0.01) percentages of red cells
than those in Ya’an. ‘Starkrimson’ apple had higher (P ≤ 0.01) percentages of red cells
than ‘Golden Delicious’ apple within the same habitat. A correlation analysis showed that
cuticular thickness, cell length of epidermis, and percentage of red cells, were positively
correlated (one-tail, P = 0.05) with anthocyanin content, but cell thickness of epidermis
or sub-epidermis was negatively correlated (one-tail, P = 0.05) with anthocyanin