摘要
从超微结构水平上研究了西瓜生殖细胞从凸透镜形到圆球形的变化。细胞变圆过程中发生细胞器重新分布:刚产生的细胞中细胞器随机分布,变圆的细胞中细胞器分布呈现极性,与花粉壁相邻区域内质网堆叠而线粒体稀少,相反,向着花粉中心区域线粒体大量聚集而内质网稀少;细胞器重新分布表明生殖细胞在结构上建立了极性。细胞变圆有助于脱离花粉壁。细胞核对着花粉壁的一面有凹陷,凹陷中有内质网和核糖体。
Generative cells in pollen of Citrullus lanatus were characterized ultrastructurally as they round out.Organelle rearrangement occurred in response to cell's rounding out.Organelles in nascent cells were distributed randomly.As rounding out,however,the cells showed polarity,extensively abundant endoplasmic reticula and very sparse mitochondria in the region near pollen wall,while much less endoplasmic reticula and a lot more copious mitochondria in the other side towards pollen center.The cells' rounding provides an insight into the mechanism for cells' departure from pollen wall.Nucleus showed deep invaginations where endoplasmic reticula and ribosomes were distributed.
出处
《武汉植物学研究》
CSCD
2003年第4期281-287,共7页
Journal of Wuhan Botanical Research
基金
This study is supported with L inyi Teachers U niversity Foundation(YJB0 10 0 2 )
关键词
西瓜
生殖细胞
细胞器重新排布
生殖细胞变圆
Citrullus lanatus
Generative cell
Organelle re-arrangement
Generative cell's rounding
