水棉屬
维基百科，自由的百科全书
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| Spirogyra Link in C. G. Nees |
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水棉屬 是雙星藻目雙星藻科中絲狀綠藻的一個屬。常見於淡水環境。水棉是一種能進行光合作用的真核生物。螺旋形的葉綠體圍繞著中心的液泡，其細胞核則位於放射狀的細胞質中間。
[编辑] 繁殖
水棉屬擁有有性生殖的能力, 水棉以細胞間互相交換遺傳物質脫氧核糖核酸進行有性生殖. Certain filaments in a loose parallel bundle of Spirogyra assume the female role, and others the male. The cells of adjacent filaments and develop tubular extensions which grow towards one another and eventually fuse to form a continuous tube between the cells. Meanwhile the contents of each cell have formed a round sphere. The spheres from the male filament squeeze their way down the connecting tubes to fuse with a sphere of the female cell in the other filament. The result of this sexual union is the formation of a zygote (zygospore) within the chambers of the female filament. After a dormant period, the zygotes undergo meiosis and germinate, resulting in new filaments.
