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The growth of tannin cells from before flowering to fruit maturity and astringency in Japanese persimmons

Summary Changes in the growth of tannin cells were investigated in Japanese persimmon (Diospyros kaki Thunb.) to determine the relationship between astringency and fruit anatomy. In the first Experiment, samples of ovaries and fruit were collected from astringent ‘Hiratanenashi’ and non-astringent ‘Matsumotowase-Fuyu’ persimmons, from flowering to fruit harvest. In the second experiment, samples were collected from ‘Fuyu’, ‘Zenjimaru’, ‘Nishimurawase’, ‘Saijo’, ‘Yokono’, and ‘Tonewase’, from fruit set to harvest. Tannin cells appeared approx. 20 d before anthesis in ‘Hiratanenashi’ and ‘Matsumotowase-Fuyu’, with a period of rapid cell division rather than enlargement, which stopped 70 d after anthesis (DAA) in ‘Hiratanenashi’ and 28 DAA in ‘Matsumotowase-Fuyu’. Tannin cells were larger in the astringent cultivars than in the non-astringent cultivars, whereas the numbers of tannin cells and the sizes of the parenchyma cells in the fruit mesocarp were similar. Tannin cells appeared to be differentiated in the mature ovary, and possibly protect the young fruit from pathogens and pests.