湖北林业科技

ecological species and rare tree species of Lauraceae Phoebenees,has a very high value.Method of using paraffinPhoebe neuranthato study the process of embryonic development.Main contents include the megasporogenesis,microsporogenesis,development of male and female gametophyte and study on ovary development after flowering.Main results show that the ovary of Phoebe neurantha had 1-locules,double integyment,thick nucellus,single ovule,a few pair of ovules,ovules was anatropous.Embryo sac development type for polygonum type,and Lauraceae other is species consistent,the megaspores mother cell formed a linear tetrad of 4 megaspores after meiosis.The chalazal megaspore developed the functional one and other three at the micropylar pole were degraded.Formed single nuclear embryo sac,after three times split,formed eight nuclear seven cell of mature embryo sac.There wrer 4-locules anther sac in flowers,The wall of flowers is consist of epiderment,endotheca endothecium,middle lamella and tapetum.Along with the further development of the anther,endothecium and disintegration of tapetal cells gradually disappear,mature pollen grains were 2-celled types.The tapetum was amoeboid.There were little pollen abortion and male sterility since the tapetum of male sterile plants delayed degradation and the microspores could not obtain enough nutrition for normal development.