Abstract
Coloring area rates in petals of Eustoma picotee cultivars were measured using an image analyzing system and the stability of the coloring pattern was evaluated by the standard deviation value. The analysis indicated significant differences in the properties of the coloring area and its stability among 16 cultivars. Many cultivars showed an increase in the coloring area rate and a decrease in its stability in petals under 20°C constant condition compared with petals under natural summer temperature condition. The cultivars could be classified to the following three types; stable type, unstable type, and unstable type under a constant temperature of 20°C. Irregular coloring occurred under each condition by cultivars with a standard deviation value is more than 16 except for cv. ‘Hikoboshi’. The picotee stability of each Eustoma cultivar was appropriately appreciable by the standard deviation value of the coloring area rates in petals grown under a constant temperature of 20°C.
