Journal article : Bulletin of the NARO, Fruit Tree & Tea Science 2017 No.1 pp.27-35 ref.22
Abstract : 'Hasshu' is a pollination-variant astringent (PVA) type of Japanese persimmon (Diospyros kaki Thunb.) cultivar released by Japan's National Agriculture and Food Research Organization (NARO) Institute of Fruit Tree Science (NIFTS) in 2013. 'Hasshu', a dwarf bud sport that originated from 'Hiratanenashi', was discovered in Akitsu, Higashihiroshima, Hiroshima Prefecture in 2005. It is octoploid (2n=120=8x). The cultivar was registered in 2015 as No. 23900 under Japan's Plant Variety Protection and Seed Act. The fruit ripens in late October, similar to 'Hiratanenashi', and about a month after 'Nakataniwase', at NIFTS (in Higashihiroshima city). The fruit is relatively flat, and averages 81 g in weight, which is about one-quarter the weight of 'Hiratanenashi'. The skin is orange at harvest time. The shelf life of 'Hasshu' fruit after treatment with carbon dioxide gas to remove astringency, was 10 days, which is the same as that of 'Hiratanenashi'. The flesh is as soft, dense, and juicy as 'Hiratanenashi' and 'Nakataniwase'. The mean soluble solids content in the juice after removing the astringency is 16.3% (°Brix), which is comparable to those of 'Nakataniwase' and 'Hiratanenashi'. 'Hasshu' produced an average of 2.8 normal seeds (with a seed weight of 1.2 g) per fruit, versus none in the other cultivars. Although fruit cracking at the calyx end is rare, fruit cracking at the stylar end occurred in 20% of the fruits. The proportion of fruit with partly darkened skin averaged 23.3%, versus 6.7% in 'Hiratanenashi' and 'Nakataniwase'. There were no shallow concentric cracks in the fruit's skin. The tree is moderately vigorous, with a shape intermediate between spreading and upright. The shoot and internode lengths were significantly shorter than those of 'Hiratanenashi' but similar to those of 'Nakataniwase'. The leaf shape was ovate and its leaf area was significantly smaller than those of 'Hiratanenashi' and 'Nakataniwase'. 'Hasshu' bore many smaller female flowers than those of 'Hiratanenashi' and 'Nakataniwase' in late May. There was little physiological fruit drop in both the early stage (June to July) and the late stage (August and later).
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