巨龙竹生殖器官形态结构及雌、雄配子体的发育

通过石蜡切片的方法对巨龙竹生殖器官结构、大小孢子的发生和雌、雄配子体的发育过程进行了观察研究。 巨龙竹为一心皮组成的单室单子房,子房内具有一个胚珠,倒生、双珠被、厚珠心。大孢子母细胞减数分裂形成线形排列的4个大孢子，合点端大孢子具功能。胚囊的发育为蓼型，具多个反足细胞。巨龙竹的花药壁由4层结构组成,包括表皮、药室内壁、中层、绒毡层；花药壁发育为单子叶型,绒毡层为腺质型。小孢子母细胞减数分裂中的胞质分裂为连续型,四分孢子为四面体型；成熟花粉粒为2细胞型,具1个萌发孔。小穗发育雌雄异熟,雌蕊的发育早于雄蕊的发育。

The structures of reproductive organs and development of the female and male gametophyte of Dendrocalamus sinicus

The investigation of the structures of reproductive organs,megasporogenesis,microsporogenesis and the development of male and female gametophyte in Dendrocalamus sinicus are made using normal paraffin method in this article.There is a simple ovary,which is unicarpellous,unilocular,and uniovulate,in one spikelet.The ovule is bitegminous,crassinucellate and anatropous.The megaspore mother cell divides into linear megaspore terad after meiosis.The development of the embryo sac is Polygonum type with numberous antipodal cells.The anther wall is composed of four layers: epidermis,endothecium, middle layer and tapetum.The development of anther wall belongs to the monocotyledonous type,and the tapetum is glander taptum.The cytokinesis of the microspore mother cells in meiosis is successive and the microspore tetrads are tetrahedial.The mature pollen grains are two-celled and mono-aperturate.It is dichogamous and protogynous in the same flower.