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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >An apparent reversal in floral symmetry in the legume Cadia is a homeotic transformation
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An apparent reversal in floral symmetry in the legume Cadia is a homeotic transformation

机译：豆科植物Cadia中花对称性的明显逆转是顺势转化

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摘要

Within papilionoid legumes, characterized by flowers with strong bilateral symmetry, a derived condition within angiosperms, Cadia (Cadia purpurea) has reverted to radially symmetrical flowers. Here, we investigate the genetic basis of this morphological reversal. Two orthologues of the floral symmetry gene CYCLOIDEA (CYC) demarcate the adaxial (dorsal) region of the flower in typical papilionoid legumes. In the model legume Lotus japonicus, one of these LegCYC genes has been shown, like CYC, to be required for the establishment of floral bilateral symmetry. This study shows that these genes are expressed in the adaxial region of the typical papilionoid flower of Lupinus, which belongs to the same papilionoid subclade as Cadia. In Cadia, these genes also are expressed, but the expression pattern of one of these has expanded from the adaxial to the lateral and abaxial regions of the corolla. This result suggests that the radial flowers of Cadia are dorsalized and, therefore, are not a true evolutionary reversal but an innovative homeotic transformation, where, in this case, all petals have acquired dorsal identity. This study raises a question over other putative reversals in animals and plants, which also may be cryptic innovations.
机译：在乳突类豆科植物中，特征是具有强烈的双边对称性的花，被子植物内的一种衍生条件，Cadia（Cadia purpurea）已恢复为径向对称的花。在这里，我们调查这种形态逆转的遗传基础。花对称基因CYCLOIDEA（CYC）的两个直系同源物在典型的乳突类豆科植物中划定了花的近轴（背侧）区域。在豆科植物日本莲的模型中，已显示出这些LegCYC基因之一（如CYC）是建立花卉双侧对称性所必需的。这项研究表明，这些基因在羽扇豆典型羽形蝶花的近轴区域表达，羽扇豆与卡迪亚属于相同的蝶形鞘亚科。在卡迪亚中，这些基因也被表达，但是其中之一的表达模式已经从花冠的近端区域扩展到了侧面和背面区域。这一结果表明，Cadia的径向花被背化，因此不是真正的进化逆转，而是创新的顺势转化，在这种情况下，所有花瓣都获得了背侧身份。这项研究对动植物中的其他推定逆转提出了一个问题，这也可能是神秘的创新。

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