中文摘要：

以单性结实的龟井蜜柑和自花结实的鄂柑1号橘为试材，对整个果实发育期的子房（幼果）、果皮和果肉的果胶酸钙、草酸钙和果胶含量变化进行了测定。结果表明，1）两品种子房（幼果）果胶酸钙含量呈类似的下降趋势；草酸钙则相反，龟井花后趋下降，而鄂柑1号却明显上升；而且鄂柑1号子房（幼果）果胶酸钙、草酸钙和果胶含量均相对较高。2）在果实增大期内，两品种果皮和果肉的果胶酸钙含量均出现显著上升，对应果皮草酸钙含量虽有波动但居相对较高水平，而果肉草酸钙则趋明显下降。3）两品种果皮和果肉水溶性果胶含量均在增大期内呈显著上升，对应原果胶含量均相对较高，进入增大后期均明显下降。

英文摘要：

An experiment was conducted to study the changes in concentrations of calcium （Ca） pectate, Ca oxalate and pectin in the ovary （fruitlet）, rind and pulp of the two cultivars, 8-year-old parthenocarpic Kamei Satsuma mandarin （Citrus unshiu Marc.） and self-pollinated Egan 1 tangerine （Citrus. reticulata Blanco） grafted on trifoliate orange rootstock （Poncirus trifoliata Raf.）, throughout fruit development in this study. This study aimed to identify the effects of fertilization on different forms of Ca and pectin in the ovary （fruitlet） and structural parts of fruit and their possible relationship with fruit development of the two different cuhivars. Ca and pectin were measured by an atomic absorption spectrophotometer and carbazole-H2SO4 spectrometry, respectively. The results showed as follows： 1） Similarly declining trends of Ca pectate concentrations were observed in the ovary （fruitlet） of both cuhivars, while dynamics of Ca oxalate concentrations were inverse. Concentrations of Ca oxalate decreased in the ovary （fruitlet） of Kamei after flowering, whereas that of Egan 1 presented significantly increasing trend. Relatively high concentrations of Ca pectate, Ca oxalate and pectin were detected in the ovary （fruitlet） of Egan 1. 2） During fruit enlargement, concentrations of Ca pectate increased significantly in the rind and pulp of both cultivars, and concentrations of Ca oxalate in the rind of both were relatively high although some fluctuations were found. However, remarkably decreasing trends were found for Ca oxalate in the pulp. 3） Water soluble pectin concentrations increased markedly in the rind and pulp of both cultivars, and protopectin concentrations were relatively high during fruit enlargement. Both cultivars presented obviously declining trends during late fruit enlargement. The relationship between changes in concentrations of Ca pectate, Ca oxalate, Water soluble pectin and proto-pectin in the ovary （fruitier） and structural parts of fruit（rind and