蓝猪耳大孢子发生和雌配子体发育

[目的]研究蓝猪耳大孢子发生和雌配子体发育。[方法]采用常规石蜡切片和超薄切片技术研究蓝猪耳大孢子发生和雌配子体发育过程。[结果]蓝猪耳为中轴胎座,倒生胚珠,单珠被,薄珠心。大孢子母细胞减数分裂形成T-形和直线形四分体。T-形四分体合点端大孢子具功能,胚囊为蓼型发育形式;直线形四分体中珠孔端大孢子具功能,最终形成八核七细胞的成熟胚囊。胚囊发育异常偶有发生,但大部分胚囊都能发育成正常的7-细胞胚囊。[结论]蓝猪耳雌性生殖细胞发育异常并不是其结实率低的主要原因。

Megasporogenesis and Female Gametophyte Development of Torenia fournieri

[Objective]To study megasporogenesis and female gametophyte development of T.fournieri.[Method]Megasporogenesis and female gametophyte development of T.fournieri were investigated by techniques of paraffin sections and ultra-thin sections.[Result]T.fournieri had axile placenta.The ovule was anatropous,unitegmic and tenuinucellatae.The megasporocyte divided into T-tetrad or linear tetrad after meiosis.The chalazal end megaspore was functional in T-tetrad and the embryo sac was the polygonum type.However,the micropyle end megaspore was functional in linear tetrad.The mature embryo sac was 7-celled and 8-nucleate type.Abnormal embryo sac was observed by chance,but most of the embryo sacs could develop normally.[Conclusion]The abnormal development of female germ cells wasn't a crucial factor for the low setting rate of Torenia fournieri.