柑桔授粉处理和单性结实子房（幼果）内源IAA,ABA和ZT含量的变化

广橙在授粉后３天内即完成受精，与未授粉子房相比，授粉子房迅速膨大，授粉处理可使内源ＩＡＡ、ＡＢＡ和ＺＴ水平急剧上升，尤其是在处理后的前３天。至第４天趋平缓。以每子房ｎｇ含量计，至处理后第３天，ＩＡＡ、ＡＢＡ和ＺＴ含量分别是处理开始时的６．８、５．２和４．１倍，而未授粉的分别为２．５、２．６和１．２倍，这种变化与子房（幼果）的发育密切相关。试验还分析了广橙授粉处理与内源激素平衡关系，发现授粉处理ＡＢ

Changes of Endogenous IAA, ABA and ZT in Pollinated, Non-pollinated and Parthenocarpic Ovary (Fruitlet) of Citrus

Changes of endogenous IAA, ABA and Zeatin ( ZT) content in pollinated and non-pollinated ovaries of Guangcheng (Citrus sinensis (L.) Osbeck) and parthenocar-pic ovaries of Satsuma mandarin (Citrus unshiu Marc. ) were determined to study the mechanism of pollination and fruit-set of citrus. The process of fertilization in Guangcheng ended in 3 days after pollination. Compared to non-pollinated ovaries of Guangcheng, the volume of pollinated ovaries increased rapidly and the levels of endogenous IAA, ABA and ZT increased sharply, especially before the process of fertilization; then they re-mained relatively steady from the fourth day after pollination. On a nanogram per ovary basis, the levels of IAA, ABA and ZT in the ovaries of Guangcheng increased by 6.8, 5.2, and 4.1 folds respectively in three days after pollination while only 2.5, 2.6 and 1.2 folds respectively in non-pollinated ones. The changes of endogenous IAA, ABA and ZT content were supposed to be closely related to the development of ovaries of Guangcheng. High levels of ABA and ZT and low level of IAA were detected in the parthenocarpic ovaries of Satsuma mandarin from full bloom to four days later. There was a significantly positive relationship between ABA and ZT content and the development of ovaries of Satsuma mandarin. It seemed that IAA played no significant part in the development of parthenocarpic ovaries of Satsuma mandarin.