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首页> 外文期刊>International journal of plant sciences >EXPRESSION OF FLORAL MADS-BOX GENES IN TWO DIVERGENT WATER LILIES: NYMPHAEALES AND NELUMBO
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EXPRESSION OF FLORAL MADS-BOX GENES IN TWO DIVERGENT WATER LILIES: NYMPHAEALES AND NELUMBO

机译：花粉盒基因在两种分水L中的表达：NY和EA

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摘要

To provide insights into the floral developmental genetics of Nymphaeales (water lilies), we investigated the expression patterns of floral organ identity genes in three genera: Cabomba, Nuphar, and Nymphaea. Additionally, because of the superficial floral similarity between Nympbaea and the early-diverging eudicot Nelumbo, we conducted the same experiments in the latter taxon. We focused on gene expression associated with (1) perianth differentiation in Nymphaeales, (2) the transition of petaloid staminodes to stamens in Nympbaea, and (3) organ identity in Nymphaea and Nelumbo. In Cabomba, the expression patterns of B-class gene homologues fit the "sliding boundaries" model, with B-class gene expression in sepals and petals. In contrast, Nuphar and Nymphaea exhibit broad B-class gene expression that extends across all floral organs (i.e., "fading borders" model). The gene expression patterns observed suggest that the innermost petals of Nymphaea originated from petaloid staminodes. Also, despite the morphological differences between flowers of Nymphaea and Nelumbo and the phylogenetic distance between these genera, floral gene expression patterns are nearly identical. Last, we infer that either the "out-of-male" hypothesis or the "mostly male" hypothesis, both of which specify derivation of floral parts from male structures, might apply to the ancestors of Nymphaeales.
机译：为了提供对睡莲（睡莲）的花发育遗传学的见解，我们调查了三个属：Cabomba，Nuphar和Nymphaea中花器官身份基因的表达模式。此外，由于睡莲和早散的杜鹃花Nelumbo之间的表面花相似，我们在后一个分类群中进行了相同的实验。我们专注于与（1）睡莲的花被分化有关的基因表达，（2）在睡莲的花瓣状的退化到雄蕊的过渡，以及（3）睡莲和莲的器官特性。在Cabomba中，B类基因同源物的表达模式符合“滑动边界”模型，在萼片和花瓣中具有B类基因表达。相反，Nuphar和Nymphaea表现出广泛的B类基因表达，该基因表达跨所有花器官（即“衰落的边界”模型）。观察到的基因表达模式表明，睡莲的最里面的花瓣起源于花瓣状的退化雄蕊。同样，尽管星莲和莲属的花在形态上有所不同，并且这些属之间的系统发生距离也不同，但花卉基因的表达方式几乎相同。最后，我们推断“男性外”假说或“多数男性”假说（两者均指定了从男性结构衍生花部）可能适用于睡莲的祖先。

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