The evolution of apical dominance in maize
The evolution of apical dominance in maize
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DOI：
10.1038/386485a0
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发表时间：
1997-04-03
期刊：
影响因子：
64.8
通讯作者：
Hubbard, L
中科院分区：
文献类型：
--
作者：
Doebley, J;Stec, A;Hubbard, L
作物植物的驯化往往涉及顶端优势的增强（植物主茎中资源的集中以及相应的侧枝抑制）(1)。这种现象的一个显著例子见于玉米（Zea mays spp. mays），与它可能的野生祖先类蜀黍（Zea mays ssp. parviglumis）相比，玉米的顶端优势显著增强(2)。先前的研究已确定类蜀黍分支1（tb1）基因是玉米这一进化变化的主要贡献者(3)。我们通过转座子标签法克隆了tb1，并在此表明它编码一种与金鱼草的cycloidea基因具有同源性的蛋白质(4)。tb1的表达模式和tb1突变植株的形态表明，tb1既能抑制侧生器官的生长，又能促进雌花序的形成。tb1的玉米等位基因的表达水平是类蜀黍等位基因的两倍，这表明基因调控变化是玉米从类蜀黍进化分化的基础。
The domestication of crop plants has often involved an increase in apical dominance (the concentration of resources in the main stem of the plant and a corresponding suppression of axillary branches)(1). A striking example of this phenomenon is seen in maize (Zea mays spp. mays), which exhibits a profound increase in apical dominance compared with its probable wild ancestor, teosinte (Zea mays ssp. parviglumis)(2). Previous research has identified the teosinte branched1 (tb1) gene as a major contributor to this evolutionary change in maize(3). We have cloned tb1 by transposon tagging and show here that it encodes a protein with homology to the cycloidea gene of snapdragon(4). The pattern of tb1 expression and the morphology of tb1 mutant plants suggest that tb1 acts both to repress the growth of axillary organs and to enable the formation of female inflorescences. The maize allele of tb1 is expressed at twice the level of the teosinte allele, suggesting that gene regulatory changes underlie the evolutionary divergence of maize from teosinte.