罗汉果胚、胚乳及胚乳吸器的发育

本文采用石蜡切片与酶解分离法对罗汉果Ｓｉｒａｉｔｉａｇｒｏｓｖｅｎｏｒｉ胚、胚乳及胚乳吸器的发育过程进行观察．ａ）罗汉果胚的发育是按Ｇｅｕｍｕｒｂａｎｕｍ的分裂程序进行的．属紫菀型．但在合子分裂成球胚过程中，胚芽原细胞分化明显．故属紫菀型的变异型。ｂ）胚乳发育属核型．在球形胚阶段，在合点端和珠孔端有发育的胚乳吸器形成并进行旺盛生长，最大长度达１４２０μｍ，心形胚期．吸器活动开始减退，合点端核型胚乳吸器转变成细胞型．由胚乳本体基部膨大细胞．充当补助吸器．ｃ）酶解分离法研究胚乳吸器的发生发育有较好的应用前景。

A RESEARCH ON THE DEVELOPMENT OF EMBRYO,ENDOSPERM AND ENDOSPERMIC HAUSTORIUM OF SIRAITIA GROSVENORI

By means of the paraffin method and enzyme-squash technique,the development of embryo, endosperm and endospermic haustorium of Siraitia grosvenori (Swingle) Jeffrey were observed.a) The development of embryo of the plant followed the Geum urbauum's dividing procedures and belong6d to Asterad type.During the zygotes divided into globular embryo, the primary cells of plumule differentiated obviously and belonged to the varaint Asterad type. b) The development of endosperm was Nuelear type.In the globular stage,the developed endospermic haustorium formed at the end of chalazal and micropyle and grew luxuriantly. The maximum length was 142μm.In the stage of heart-shaped embryo,the activity of haustorium began to drop. The nuclear-type endospermic haustorium at the end of chalazal turnedto cellular type. The endospermic haustorium at the end of micropyle disintegragud gradually. The bulged cells at the base of endosperm served as the auxiliary haustorium,c) To apply enzyme-squash technique on researching the occurrence and developmeat of haustorium provides with a better foreground.