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首页> 外文期刊>Journal of genetics >Upper petal lip colour polymorphism in Collinsia heterophylla (Plantaginaceae): genetic basis within a population and its use as a genetic marker
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Upper petal lip colour polymorphism in Collinsia heterophylla (Plantaginaceae): genetic basis within a population and its use as a genetic marker

机译：Collinsia heterophylla（Plantaginaceae）的上花瓣唇颜色多态性：群体内的遗传基础及其作为遗传标记的用途

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Understanding the genetics of a polymorphic trait is important to predict its likely evolution. In Collinsia heterophylla, the upper petal lip colour can be either be white or white with a purple band, while the lower petal lip colour is invariably purple. Because the corolla is only partly polymorphic, the polymorphism can not have evolved due to a mutation where a pigment was lost in the entire plant, which is common in other polymorphic species. In a previous study, high frequency of the purple band was found in populations with darker flowers, indicating possible selection for this trait. In this study, I determined inheritance of the colour polymorphism using two populations (one with only white morph and other with both morphs). I conducted experimental crosses within and between floral morphs to determine whether patterns of segregation in offspring conform to single-gene predictions. Data from F-1, F-2, F-3 and backcross progeny are consistent with a genetic model of one major locus with presence of the band being completely dominant, as indicated in earlier studies using distantly related populations. A novel finding in this study was that the two morphs did not show a difference in seed germination frequency or seedling survival. This trait can thus be valuable as a genetic marker. Even though more thorough ecological data are needed to understand the potential selection pressures on upper petal lip colour in C. heterophylla, its simple inheritance may indicate the possibility of fast evolutionary response to selective forces acting on this trait.
机译：了解多态性状的遗传学对预测其可能的进化很重要。在Collinsia heterophylla中，上花瓣的嘴唇颜色可以是白色或带紫色带的白色，而下花瓣的嘴唇颜色始终是紫色的。由于花冠仅是部分多态的，因此由于突变导致整个植物中的色素丢失，因此多态性无法进化，这在其他多态性物种中很常见。在先前的研究中，在花朵较深的人群中发现了紫色条带的高频率，这表明该性状的可能选择。在这项研究中，我使用两个种群（一个只有白色变种，另一个只有两个变种）确定了颜色多态性的遗传。我在花形内部和之间进行了实验性杂交，以确定后代中的分离模式是否符合单基因预测。 F-1，F-2，F-3和回交后代的数据与一个主要基因座的遗传模型一致，该条带的存在完全占主导地位，这在较早的研究中已经表明。在这项研究中的一个新发现是，这两种变体在种子发芽频率或幼苗存活率上均未显示差异。因此，该性状可以作为遗传标记有价值。即使需要更全面的生态学数据来了解异叶茶的上花瓣唇颜色的潜在选择压力，但其简单的遗传可能表明对作用于该性状的选择性力快速进化反应的可能性。

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