New Japanese Persimmon Cultivar 'Taigetsu'

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  • カキ新品種 '太月'

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Taigetsu' is a pollination variant astringent (PVA) type of Japanese persimmon (Diospyros kaki Thunb.) cultivar released by National Agriculture and Food Research Organization Institute of Fruit Tree Science (NIFTS), Japan, in 2007. 'Taigetsu' resulted from the cross of 'Kurokuma'× 'Taishu'. The clone was initially selected and designated as Kaki Akitsu-20, and was tested at 24 locations in a national trial. It was ultimately selected and released as 'Taigetsu', and registered as No.17492 under the Plant Variety Protection and Seed Act of Japan in 2009. 'Taigetsu' is a mid-ripening cultivar, and its fruit ripens in early November, comparable to 'Hiratanenashi' and 'Matsumotowase-Fuyu' at NIFTS Akitsu. Its fruit is moderately flat-shaped, weighing an average of 459 g at NIFTS Akitsu, which is 1.8 times of 'Hiratanenashi' fruit. The skin color is yellowish orange at harvest time. The flesh is soft, moderately coarse and very juicy. Flesh firmness is 0.9kg, which is comparable to 'Hiratanenashi' and lower than 'Matsumotowase-Fuyu'. The soluble solids content in juice after removing astringency averages 15.4%, which is comparable to 'Hiratanenashi'. 'Taigetsu' can be commercially grown in 'Hiratanenashi' production areas. Fruit cracking at the calyx or stylar end is rare. However, shallow concentric cracks on the fruit skin are likely to occur in a considerable percentage of the fruit. The percent fruit with skin darkening including those cracks averaged around 44% as compared with 7% in 'Hiratanenashi' in the national trial. Shelf life of 'Taigetsu' fruit after the carbon dioxide gas treatment removing astringency averaged 11 days at ambient temperature in the national trial, which was comparable to that in 'Hiratanenashi'. The tree is vigorous and very productive. It is spreading in shape. It easily produced many female flowers every year, and very few male flowers in the trials. Parthenocarpy in 'Taigetsu' is high, and fruit drop in the early fruit-developmental stage in June and July was rare for trees subjected to flower thinning at around 13 leaves/flower ratio. 'Taigetsu' yield was estimated to be 30 metric tons/ha or more.

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