Journal article : Bulletin of the NARO, Fruit Tree & Tea Science 2017 No.1 pp.9-17 ref.12
Abstract : 'Rose Pearl' is a new apple (Malus pumila Mill.) cultivar with pink flesh released by the National Agriculture and Food Research Organization, Institute of Fruit Tree and Tea Science (NIFTS) in Japan. 'Rose Pearl' originated from a cross between 'Fuji' and the red-fleshed 'Pink Pearl' made in 1990 at NIFTS, Morioka. The tree was initially selected in 2008 on the basis of its pink flesh trait with good fruit quality. It was released as 'Rose Pearl' and registered as No. 24267 under the Plant Variety and Seedling Act of Japan in 2015. The fruit of 'Rose Pearl' ripens in mid-October in Morioka. Its shape is globose to short-globose-conical. It has a mean fruit weight of about 400 g, about 150 g larger than 'Jonathan'. The skin is light yellow at harvest with a dull pink blush on the side exposed to direct sunlight. The texture of the flesh is medium-crisp, superior to that of 'Pink Pearl'. The fruit is moderately to highly juicy, with a mean soluble solids content of 14.3% (significantly higher than in 'Pink Pearl') and a titratable acidity of 0.57 g/100 mL (significantly lower than in 'Pink Pearl' and 'Jonathan'). The tree is spreading in shape with medium vigor on JM1, and it blooms 3 days earlier than 'Jonathan'. Since its S-genotype is S1 S3, 'Rose Pearl' is cross-compatible with major commercial cultivars such as 'Fuji' (S1 S9) and 'Tsugaru' (S3 S7). 'Rose Pearl' is resistant to Alternaria leaf spot.
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