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西瓜绒毡层和花粉发育的进一步观察

FURTHER OBSERVATION ON TAPETUM AND POLLEN DEVELOPMENT IN WATERMELON

  • 摘要: 绒毡层为1层同型细胞, 腺质性, 幼期与其他药壁层相似, 减数分裂开始后逐渐表现出自己独有的特点。小孢子母细胞纤维素壁生存到四分体时期, 随着小孢子外壁出现而消失。四分体时期, 小孢子发育出网状原覆盖层和柱状原基粒棒。成熟花粉属2-细胞型, 含丰富淀粉和脂类物质, 生殖细胞具有流线型结构, 呈梭形或柳叶形。营养核与生殖细胞联系密切。

     

    Abstract: Tapetum in watermelon is a layer of homogenous and glandular cells.Tapetal cells are very similar in appearance to cells of other anther layers at first, but gradually differentiate after microspore mother cells begin meiotic division.Microspores form a reticular protectum and columnar probacules as they are still encased in callose. Cellulosic walls of microspore mother cells become disappeared during tetrad stage.Pollens get mature at 2-celled stage.Generative cell has a streamlined shape.Vegetative cell contains copious starch and lipid.It is clear that there is a close connection between generative cell and vegetative nucleus.

     

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