Relauonship between the Capacity of Deastrigency and Development of Tannin Cell in Persimmon Fruits

Content of soluble tannin,development of tannin,and parenchymatous cells in three different type fruits of persimmon were studied.Results showed that pollination constant non-astringent(PCNA)type fruits removed astringency in the early stage of fruit development,whereas pollination variation non-astringent(PVNA)ones did it at pre-mature time. Natural removal of PCNA type fruits referred to constant development of parenchymatous cells and cease of enlargement of tannin cells which resulted in the decrease of relative area occupied by tannin cells. In contrast with PCNA type,PCNA type remove its abtringency by coagulation of tannin cells before ripeness. These mechanisms were not present in astringent fruits of persimmon. The courses of cell development and astringency renioval was earlier in Hangzhou area than that in provenance.