ISHS Acta Horticulturae 436: I International Persimmon Symposium
DEVELOPMENT OF FROST HARDINESS IN JAPANESE PERSIMMONS. |
| Authors: | P. Leng, T. Okamori, H. Itamura, H. Yamamura |
| Keywords: | differential thermal analysis (DTA), Diospyros kaki, frost hardiness, persimmon, polyphenols, winter hardiness |
| Abstract:
Relationship between frost hardiness and geographical distribution of habitats in the native cultivars of Japanese persimmons was investigated. Of fourteen cultivars of Japanese persimmons and 5 or 6 cultivars of Chinese and Korean persimmons, frost hardiness during the cold acclimation of 1-year-old twigs was estimated at Matsue on 35 North Latitude by the differential thermal analysis (DTA) and by electrolyte leakage from the bud tissues after the freezing treatment at -22.5°C. Japanese persimmons which were native to the northern coast of Japan were relatively hardy, however, almost no relationship was found between frost hardiness and the place of origin. The lowest values of low temperature exotherm (LTE) in the season were mostly found in twig tissues of Korean and Chinese persimmons at the end of December to mid-January and in those of Japanese persimmons at late January to early February. Lower LTE values were found in twig tissues of Korean 'Kojongshi', 'Banshi', Chinese 'Taiwan hongshi', 'Denglong' and Japanese 'Moriya', 'Fuyu' at the coldest month, compared with 'Mapang' which was native to northern China. | |
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