Abstract
In this study, we compared the occurrence of coloring disorders in mango cultivars with different skin colors under high humidity conditions. The following nine cultivars were used : ‘Amakinboshi’ (skin color: yellow green), ‘Ataulfo’ (yellow), ‘Bailey’s Marvel’ (yellow green), ‘Carrie’ (yellow green), ‘Golden Nugget’ (yellow green), ‘Irwin’ (red), ‘Jubilee’ (red), ‘Mallika’ (yellow) and ‘Tahar’ (red). In addition, the fruit quality of these cultivars was also investigated. The full bloom stage of each cultivar ranged from late February to middle March, and the peak of harvest ranged from late June to late July. High humidity treatment started in late April and continued until the end of harvest. High humidity was maintained during the treatment period, with an average daily maximum relative humidity of 98 %. Coloring disorders (red bruise and mottled skin) occurred in reddish cultivars (‘Irwin’, ‘Jubilee’ and ‘Tahar’), but not in those other than red. In ‘Irwin’ and ‘Jubilee’, the later the harvest time, the greater the degree of coloring disorder. Fruit weight was more than 600 g in ‘Bailey’s Marvel’ and ‘Jubilee’, but less than 400 g in ‘Ataulfo’ and ‘Carrie’. The brix was higher in ‘Amakinboshi’, ‘Ataulfo’, ‘Bailey’s Marvel’, ‘Carrie’, ‘Golden Nugget’ and ‘Mallika’ than that in ‘Irwin’. In conclusion, it was clarified that the occurrence of coloring disorders under high humidity conditions is a physiological one peculiar to reddish cultivars.
