| 濒危植物-半日花(Helianthemum songaricum)的双受精作用及胚和胚乳发育 |
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| 引用本文： | 马虹,屠骊珠,王迎春,曹瑞,郭晓雷.濒危植物-半日花(Helianthemum songaricum)的双受精作用及胚和胚乳发育[J].内蒙古大学学报(自然科学版),1999(1). |
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| 作者姓名： | 马虹 屠骊珠 王迎春 曹瑞 郭晓雷 |
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| 作者单位： | 内蒙古大学生命科学学院，呼和浩特市园林科研所 |
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| 摘 要： | 运用石蜡切片法，对半日花Ｈ．ｓｏｎｇａｒｉｃｕｍ的受精过程，胚及胚乳发育进行了初步观察．受精前，一个助细胞解体，另一助细胞宿存．精核与极核的融合早于精核与卵的融合．受精极核不经过休眠过程，经多次分裂形成核型胚乳．胚乳游离核于球胚晚期开始细胞化．种子成熟后无胚乳．胚胎发育属柳叶菜型．胚柄由一纵列细胞组成并于球胚晚期开始退化．胚的发育经历球形原胚、心形胚、鱼雷形胚及成熟胚各时期．
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| 关 键 词： | 半日花 受精 胚和胚乳 |
The Fertilization and the Development of Embryo and Endosperm in an Endangered Plant Helianthemum songaricum Schrenk |
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| MA Hong ,TU Li zhu ,WANG Ying chun ,CAO Rui ,GUO Xiao lei.The Fertilization and the Development of Embryo and Endosperm in an Endangered Plant Helianthemum songaricum Schrenk[J].Acta Scientiarum Naturalium Universitatis Neimongol,1999(1). |
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| Authors: | MA Hong TU Li zhu WANG Ying chun CAO Rui GUO Xiao lei |
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| Institution: | MA Hong 1,TU Li zhu 1,WANG Ying chun 1,CAO Rui 1,GUO Xiao lei 2 |
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| Abstract: | The fertilization and development of embryo and endosperm of the endangered species Helianthemum songaricum are reported.Before fertilization,one of the synergids has degenerated.Fusion of one sperm with polar nucleus is faster than that of one sperm with egg nucleus.The development of endosperm is of the nuclear type.Endosperm nuclei form cells since the later stage of the globular embryo.The mature seeds has no endosperm.The development of embryo is of the Onagrad type.The suspensor consists of vertical cells and begins to degenerate after late globular stage.The embryo develope from proembryo,heart shaped embryo,dicotyledenous to mature embryo.This paper discuss the relativity between the development of embryo and ecological environment. |
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| Keywords: | Helianthemum songaricum fertilization embryo and endosperm |
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