Abstract: Early differentiation of floral primordium before the appearance of megascopic primordia protuberance was investigated im Cucumis sativus L. The results showed that the differentiation of floral primordium and flower firstly occurred at the axil of the fire leaf. Before the appearance of megascopic primordia protuberance, a spherical cell aggregate with active cell division appeared at subepidermis as an early primordium at 6-7 day age of seedlings.

Key words: Cucumis sativus

摘要： 以黄瓜为试验材料研究了肉眼可见的花原基突起之前，花原基早期的分化过程。结果显示花原基分化和开花的起始节位是第一真叶节；肉眼可见花原基突起前早期的分化是在叶腋亚表皮部位形成一个球形的花原基起始细胞团，此细胞团进一步分裂、扩大形成肉眼可见的花原基突起；第一真叶节的花原基起始细胞团分化集中发生于6～7d苗龄时期；Ca2+在花原基起始细胞团细胞中主要分布在细胞壁和细胞间隙，而在非起始细胞团的叶腋亚表皮细胞则主要分布在液泡中，并对Ca2+在花原基起始细胞团分化中的作用进行了讨论。

关键词: 黄瓜, 花原基形成, 花的分化