南京林业大学学报(自然科学版) ›› 1995, Vol. 19 ›› Issue (01): 15-20.doi: 10.3969/j.jssn.1000-2006.1995.01.003

• 研究论文 • 上一篇    下一篇

中国鹅掌楸雄性生殖单位的二维结构

周坚,樊汝汶   

  1. 南京林业大学森林资源与环境学院
  • 出版日期:1995-03-18 发布日期:1995-02-18

DIMENSIONAL FEATURES OF MALE GERM UNIT IN LIRIODENDRON CHINENSE SARG.

Zhou Jian; Fan Ruwen   

  1. College of Forest Resources and Environment Nanjing Forestry University Nanjing 210037
  • Online:1995-03-18 Published:1995-02-18

摘要: <正>中国鹅掌楸(Liriodendronchinense)花粉属二细胞型。观察了6枚在异己-北美鹅掌楸(L.fulipifera)柱头沟中的花粉管。在花粉管进入柱头沟时,管长为花粉直径的4~10倍期间,生殖细胞分裂形成两精细胞。同一花粉管的两精子在大小、形态上有明显差异,精子两形。两精细胞相互邻接,位于管的先端,两精子被营养细胞内质膜包围,大的精细胞(Svn)通过细胞延伸包围营养核,同时部分地被营养核的裂片所包围。两精子和营养核形成的共同包装即为雄性生殖单位(MaleGermUnit)。败育花粉管中,精细胞几乎同形,不形成细胞延伸,与营养核间没有共同包装。

Abstract: :The pollen of Liriodendron chinense is of two-cell type.The six pollen tubes located at the stigma chord of alien-L.tulipifera wer observed with electron microscope.When the pollen tube extended to the stigma chord,and the length of the pollen tube was 4-10 times as the diameter of pollen, the generative cell split into two sperms.The two sperms of a given pollen tube were different in size and morphology,namely sperm heteromorphism.Sperm-to-sperm connection was near the pollen tube tip.The sperms were also encompassed by the inner vegetative cell plasma membrane,and one sperm(Svn)was consistently associated with the vegetative nucleus through a sperm cell extension that embraces the vegetative nucleus and was partially surrounded by lobes of the vegetative nucleus.The sperm cell-vegetative nucleus packaging is called Male Germ Unit.When pollen tube degenerated,the sperm cell did not extend and the packaging of sperm cell-vegetative nucleus did not result.