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在早期的血管精子血统中识别双胞体内精子

Joseph H Williams¹, William E Friedman

¹Department of Environmental, Population and Organismic Biology, University of Colorado, Boulder, Colorado 80309, USA.

|February 2, 2002

概括

双胞体双亲内,以前认为在开花植物中很少见,在像Nuphar polysepalum这样的基底系中很常见. 这一发现表明二倍体内精可能是血管精的祖先条件,三倍体内精后来进化.

科学领域:

植物生殖生物学植物生殖生物学
进化发育生物学进化发育生物学
血管精子基因组学

背景情况:

种子植物胚胎的营养通常涉及一个单体母性雌同体.
开花植物在受精后独特地发展出双亲内.
三倍体双亲内长期以来一直被认为是血管的祖先状态.

研究的目的:

调查基底血管精子中的内精的性和遗传起源.
挑战长期以来关于花植物祖先的三倍体内精的假设.
探索血管精子中内精子发育的进化轨迹.

主要方法:

跨种子植物谱系内精子发育的比较分析.
在Nuphar polysepalum的遗传和发育研究.
血管精子内精子进化的遗传学分析.

主要成果:

在Nuphar polysepalum中发现了双胞胎双亲内,这是一个基底血管.
证据表明双胞胎内精在早期的血管精子系中普遍存在.
数据表明双胞胎内可能代表了开花植物的祖先条件.

结论:

血管精子内的祖先状态很可能是双胞胎双胞胎,而不是三胞胎.
三倍体内精子从双倍体前体通过受精的修改进化.
这一发现重新塑造了我们对血管精子繁殖进化的理解.

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