A cytological study on Apluda mutica L. revealed that this species was a facultative apomict with 60.74% of apomictic embryo sac formation. Its sexual reproduction exhibited the characteristics of polygonum_type embry...A cytological study on Apluda mutica L. revealed that this species was a facultative apomict with 60.74% of apomictic embryo sac formation. Its sexual reproduction exhibited the characteristics of polygonum_type embryo sac formation. After the 3 megaspores at the micropylar end had degenerated, leaving only the chalazal megaspore in the nucellus, a nucellar cell adjacent to the megaspore differentiated into an aposporous initial, which later developed into a panicum_type embryo sac. It was an aposporous 4_nucleate embryo sac without chromosome reduction and composed of an egg, a single synergid and a central cell with 2 polar nuclei. The chalazal megaspore degenerated before the onset of the division in the aposporous initial cell.展开更多
This research was carried out in the area of experimental embryology, which covers from animal fertilization to cloning. Two achievements in the field of reproductive bilogy have created major influence in the past 50...This research was carried out in the area of experimental embryology, which covers from animal fertilization to cloning. Two achievements in the field of reproductive bilogy have created major influence in the past 50 years, One is the discovery of sperm capacitation and the establishment of in vitro fertilization technology, and the other is the birth of somatic cell nuclear transfer animals. Although researches in reproductive bilogy have developed very quickly and a lot of literatures have been published. many basic theoretical questions are still remained illusive. This paper gives a brief description of our researches during the past decade.展开更多
文摘A cytological study on Apluda mutica L. revealed that this species was a facultative apomict with 60.74% of apomictic embryo sac formation. Its sexual reproduction exhibited the characteristics of polygonum_type embryo sac formation. After the 3 megaspores at the micropylar end had degenerated, leaving only the chalazal megaspore in the nucellus, a nucellar cell adjacent to the megaspore differentiated into an aposporous initial, which later developed into a panicum_type embryo sac. It was an aposporous 4_nucleate embryo sac without chromosome reduction and composed of an egg, a single synergid and a central cell with 2 polar nuclei. The chalazal megaspore degenerated before the onset of the division in the aposporous initial cell.
文摘This research was carried out in the area of experimental embryology, which covers from animal fertilization to cloning. Two achievements in the field of reproductive bilogy have created major influence in the past 50 years, One is the discovery of sperm capacitation and the establishment of in vitro fertilization technology, and the other is the birth of somatic cell nuclear transfer animals. Although researches in reproductive bilogy have developed very quickly and a lot of literatures have been published. many basic theoretical questions are still remained illusive. This paper gives a brief description of our researches during the past decade.
