Piskurewicz Urszula, Iwasaki Mayumi, Susaki Daichi, Megies Christian, Kinoshita Tetsu, Lopez-Molina Luis
Department of Plant Biology, University of Geneva, Geneva, Switzerland.
Institute for Genetics and Genomics in Geneva (iGE3), University of Geneva, Geneva, Switzerland.
Elife. 2016 Dec 22;5:e19573. doi: 10.7554/eLife.19573.
Mature seed dormancy is a vital plant trait that prevents germination out of season. In , the trait can be maternally regulated but the underlying mechanisms sustaining this regulation, its general occurrence and its biological significance among accessions are poorly understood. Upon seed imbibition, the endosperm is essential to repress the germination of dormant seeds. Investigation of genomic imprinting in the mature seed endosperm led us to identify a novel set of imprinted genes that are expressed upon seed imbibition. Remarkably, programs of imprinted gene expression are adapted according to the dormancy status of the seed. We provide direct evidence that imprinted genes play a role in regulating germination processes and that preferential maternal allelic expression can implement maternal inheritance of seed dormancy levels.
成熟种子休眠是一种重要的植物特性，可防止种子在非适宜季节萌发。在植物中，这种特性可由母体调控，但维持这种调控的潜在机制、其普遍存在情况以及在不同种质间的生物学意义却知之甚少。种子吸胀后，胚乳对于抑制休眠种子的萌发至关重要。对成熟种子胚乳中的基因组印记进行研究，使我们鉴定出了一组在种子吸胀时表达的新的印记基因。值得注意的是，印记基因的表达程序会根据种子的休眠状态进行调整。我们提供了直接证据，表明印记基因在调控萌发过程中发挥作用，并且母本等位基因的优先表达能够实现种子休眠水平的母系遗传。
Zotero 插件
