摘要
利用普通光学显微镜和扫描电镜技术对黄金树花器官的发生及发育过程进行了观察。结果显示:(1)黄金树花器官的形态发生及发育过程集中于3月下旬—5月上旬;(2)花原基分化形成花的整个过程符合一般的分化顺序:花萼原基—花冠原基—雄蕊原基—雌蕊原基,且各原基在分化顺序上存在交叉;(3)花药及胚珠的发育与花器官的形态发生之间有明显的连续性,当花蕾直径为3.0mm左右时花粉母细胞及完整的花粉囊壁形成,直径达到3.5mm左右时胚珠中出现孢原细胞的分化,它直接起大孢子母细胞的功能。
The initiation and development of flower organs in Catalpa speciosa （Warder） Warder ex Engelm were observed by light microscope and scanning electron microscope. The results showed that： （1） The whole process of floral initiation and development lasted about one month from late March to early May; （2） On the floral apex the different classes of organ primordia appeared in the following sequence ： calyx, corolla, androecium and gynoecium, and they had overlapped with each other when occurring in turn; （3） The development of anther and ovule followed the finish of the flower organ initiation. Pollen mother cells and well developed microsporagium wall occurred when the diameter of the bud reached about 3.0 rnm, and the archesporial cell which played the role of megaspore mother cell formed in ovule when the diameter of the bud reached about 3.5 mm.
出处
《园艺学报》
CAS
CSCD
北大核心
2009年第2期285-290,共6页
Acta Horticulturae Sinica
基金
国家重点基础研究发展计划项目(2007CB106802)
国家林业局‘948’项目(2006-2-02)
天津市自然科学基金项目(07JCYBJC12500
07JCYBJC12400)
关键词
黄金树
紫葳科
花器官发生及发育
形态解剖
Catalpa speciosa （Warder） Warder ex Engelm
Bignoniaceae
floral organogenesis and development
morphology and anatomy
