Molecular evolution of the petal and stamen identity genes, APETALA3 and PISTILLATA, after petal loss in the Piperales
Molecular evolution of the petal and stamen identity genes, APETALA3 and PISTILLATA, after petal loss in the Piperales
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DOI：
10.1016/j.ympev.2007.03.015
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发表时间：
2007-08-01
影响因子：
4.1
通讯作者：
Kramer, Elena M.
中科院分区：
文献类型：
--
作者：
Jaramillo, M. Alejandra;Kramer, Elena M.
器官丧失是各种多细胞生物普遍存在的一种进化现象。在被子植物的多样化过程中，花瓣已经丢失了好几次。我们研究了花被植物的花瓣和雄蕊特征基因的进化，花被植物是被子植物的一个基本谱系，包括花被发育良好的花被科胡椒科、龙花科和马兜铃科。在此，我们提供了在花瓣丢失后，花瓣和雄蕊的同源基因APETALA3和雌蕊的同源基因选择放松的证据。我们的研究结果特别有趣，因为b类基因不仅负责花瓣的产生，而且是雄蕊身份的核心，雄蕊是这些植物中没有改变的配偶生殖器官。在失去这些器官中的一个后，放松的纯化选择表明，这些基因在胡椒属植物中的功能作用已经分离。(c) 2007爱思唯尔公司版权所有。
Organ loss is an evolutionary phenomenon commonly observed in all kinds of multicellular organisms. Across the angiosperms, petals have been lost several times over the course of their diversification. We examined the evolution of petal and stamen identity genes in the Piperales, a basal lineage of angiosperms that includes the perianthless (with no petals or sepals) families Piperaceae and Saururaceae as well as the Aristolochiaceae, which exhibit a well-developed perianth. Here, we provide evidence for relaxation of selection on the putative petal and stamen identity genes, homologs of APETALA3 and PISTILLATA, following the loss of petals in the Piperales. Our results are particularly interesting as the B-class genes are not only responsible for the production of petals but are also central to stamen identity, the mate reproductive organs that show no modification in these plants. Relaxed purifying selection after the loss of only one of these organs suggests that there has been dissociation of the functional roles of these genes in the Piperales. (c) 2007 Elsevier Inc. All rights reserved.