Megasporogenesis, Microsporogenesis and Development of Male and Female Gametophytes in Ceratoides arborescens

Traditional paraffin sectioning method was used to observe the development of megasporore,microsporore,male and female gametophytes.The result showed:(1)the anther has four chambers and the development of anther wall is elementary type,which is composed of epidermis,endothecium,has 1~2 middle layers and one tapetum layer.The tapetum belongs to glandular type;(2)The cytokinesis of microspore mother cell in meiosis is simuteneous,and most of the tetrad are tetrahedral,decussation is also observed;(3)Empty pollen grains are observed at the stage of haploid nuclear microspore;mature pollen grain is 2-cells;(4)Ovule is anatropous,bitegminous and crassinucellate,micropyle is formed by the inner integument.The megaspore mother cells undergo meiosis division to form a linear tetrad,and the chalazal megaspore is the functional one,the embryo sac is 'Polygonum type'.