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首页> 美国卫生研究院文献>Proceedings of the Royal Society B: Biological Sciences >Evidence for parent-of-origin effects and interparental conflict in seeds of an ancient flowering plant lineage
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Evidence for parent-of-origin effects and interparental conflict in seeds of an ancient flowering plant lineage

机译：古代开花植物谱系种子的亲本效应和亲本冲突的证据

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摘要

Theoretical and empirical studies have long connected the evolutionary innovation of endosperm, a genetically biparental product of a double fertilization process unique to flowering plants (angiosperms), to conflicting parental interests over offspring provisioning. Yet, none of these studies examined interparental conflict in representatives of any of the most ancient angiosperm lineages. We performed reciprocal interploidy crosses in the water lily Nymphaea thermarum, a member of one of the most ancient angiosperm lineages, Nymphaeales. We find that an excess of paternal genomes is associated with an increase in endosperm growth. By contrast, maternal ploidy negatively influences development or growth of all seed components, regardless of paternal genome dosage. Most relevant to the conflict over distribution of maternal resources, however, is that growth of the perisperm (seed storage tissue derived from the maternal sporophyte, found in all Nymphaeales) is unaffected by paternal genome dosage—ensuring maternal control of maternal resources. We conclude that the evolutionary transfer of embryo-nourishing function from a genetically biparental endosperm to a genetically maternal perisperm can be viewed as an effective maternal strategy to recapture control of resource distribution among progeny, and thus that interparental conflict has influenced the evolution of seed development in this ancient angiosperm lineage.
机译：理论和经验研究长期以来一直将胚乳的进化创新与开花后的植物（养子植物）独特的双重受精过程的遗传双亲产物与父母的利益冲突联系起来。但是，这些研究都没有检查任何最古老的被子植物谱系中的父母之间的冲突。我们在睡莲Nymphaea thermarum（最古老的被子植物谱系之一Nymphaeales的成员）中进行了互作的倍体杂交。我们发现，过多的父本基因组与胚乳的生长增加有关。相比之下，母本倍性会对所有种子成分的发育或生长产生负面影响，而与父本基因组剂量无关。然而，与母体资源分配冲突最相关的是，被子植物的生长不受所有父本基因组剂量的影响，从而确保了母体对母体资源的控制。我们的结论是，可以将胚胎滋养功能从遗传双亲胚乳向遗传母系胚乳的进化转移视为一种有效的母体策略，以重新获得对子代间资源分配的控制，因此，亲本冲突影响了种子发育的进化。在这个古老的被子植物血统中

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