裸体玉米粒的起源 玉米的原产地
Huai Wang1, Tina Nussbaum-Wagler, Bailin Li
1Laboratory of Genetics, University of Wisconsin, Madison, Wisconsin 53706, USA.
Nature
|August 5, 2005
概括
玉米的化涉及一个关键的基因,theosinte glume架构 (tga1),使核暴露. 这个单一的基因.
科学领域:
- 进化生物学是进化的生物学.
- 植物遗传学 植物遗传学
- 农业科学 农业科学
背景情况:
- 玉米 (Zea mays ssp. 这种玉米有很多种. 化涉及一个关键的进化步骤:核的解放从它的保护外,一个特征存在于它的祖先,theosinte.
- 这种适应暴露了玉米核,使其成为人类可行的食物来源,也是玉米进化的一个关键时刻.
研究的目的:
- 为了确定控制玉米和神合成玉米之间核外的表型差异的遗传基础.
- 研究特定基因在玉米化过程中的作用.
主要方法:
- 基因映射以确定负责表型变异的区域.
- 对DNA序列进行分析,以确定在映射区域内的玉米和神玉米之间的遗传差异.
- 分子进化分析以检测选择的签名.
主要成果:
- 一个单一的基因,theosinte glume architecture (tga1),属于SBP-domain家族的转录调节器,控制了关键的化特征.
- 致病的遗传因素位于1基基基区域内,玉米和神合成之间只有7个固定的DNA序列差异.
- 一个差异涉及非保守的氨基酸替代,可能会影响蛋白质功能,而其他差异可能会影响基因调节.
结论:
- 单个基因中适度的遗传变化可以在化和进化过程中推动显著的表型变化.
- 在玉米化过程中,tga1基因是选择的首要目标,促进了从theosinte过渡到现代玉米.
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