连翘花芽分化及发育的初步研究

 利用普通光学显微镜和扫描电镜对连翘的花芽分化及发育过程进行了观察。观察结果如下:(1) 连翘花芽分化期为5月中下旬～7月中旬, 整个过程可分为未分化期、分化初期、花萼原基分化期、花冠和雄蕊原基分化期、雌蕊原基分化期。(2) 雌雄蕊的发育紧随着花芽分化的完成而进行。9月上旬花药中分化出花粉母细胞和完整的花粉囊壁; 10月下旬胚珠的发育进入大孢子母细胞阶段。

Initiation and Development of Flower Buds in Forsythia suspensa

The differentiation and development of flower buds in Forsythia suspensa were observed by light microscope (LM) and scanning electron microscope (SEM). The results were: (1) The differentiation of flower buds began at the period between middle and late May and continued to middle July. The whole process could be divided into five stages: vegetative stage, initial differentiation stage, sepal primordial initiation stage, corolla and anther primordial initiation stage, carpel primordial initiation stage. (2) The development of pistil and stamen followed the finish of the flower bud differentiation. Pollen mother cells and completely developed microsporagium wall were observed at the period of early September and megaspore mother cell in ovule was observed at the period of late October.