两个柑橘品种花期前后子房(幼果)和春梢叶中不同形态钙和果胶含量变化

对单性结实的龟井温州蜜柑和自花结实的鄂柑l号花期前后子房（幼果1和春梢叶的果胶酸钙、草酸钙、水溶性果胶和原果胶含量变化进行研究。结果表明：（1）两品种子房（幼果）和春梢叶中果胶酸钙含量变化均相类似且变幅小，但鄂柑1号的含量相对较高；两品种草酸钙的含量变化则因器官不同而有所区别，在春梢叶中，两者呈类似的上升趋势，而于子房（幼果）中两者却相反，龟井蜜柑花后趋下降，鄂柑1号却明显上升；鄂柑l号子房（幼果）的草酸钙含量较龟井蜜柑高。（2）两品种子房（幼果）和春梢叶原果胶含量动态相似，均于花后出现明显上升；而水溶性果胶动态差异明显，龟井蜜柑子房（幼果）和春梢叶在花后6d均出现上升峰值；鄂柑1号的水溶性果胶和原果胶含量均相对较高。

Dynamics of Different Forms of Calcium and Pectin in Ovary (Fruitlet) and Spring-flush Leaves of Two Citrus Cultivars around Flowering

The dynamics of calcium pectate,calcium oxalate,water soluble pectin and proto-pectin in the ovary(fruitlet) and spring-flush leaves of parthenocarpic Kamei Satsuma mandarin(Citrus unshiu Marc.) and self-pollinated Egan 1 tangerine(Citrus reticulata Blanco) around flowering were investigated.The results were as follows.Dynamics of Ca pectate concentrations in the ovary(fruitlet) and spring-flush leaves of two cultivars were similar,and they changed slightly,while dynamics of Ca oxalate concentrations in the ovary(fruitlet) were inverse between both cultivars.The concentration of Ca oxalate decreased gradually in the ovary(fruitlet) of Kamei,whereas that of Egan 1 increased significantly after flowering.The concentration of Ca oxalate in spring-flush leaves of both presented similarly increasing trends,and the concentrations of Ca pectate in the ovary(fruitlet) and spring-flush leaves and Ca oxalate in the ovary(fruitlet) of Egan 1 were at relatively high level.It was found that the dynamics of water soluble pectin in the ovary(fruitlet) and spring-flush leaves were obvious different between two cultivars.But the dynamics of proto-pectin of two cultivars were similar.Notable increases were observed for them after flowering.The concentrations of water soluble pectin and proto-pectin of Egan 1 were relatively high.Relationships between changes in concentrations of two forms of Ca and two forms of pectin in the ovary(fruitlet) and spring-flush leaves and development of leaves and fruits were discussed.