Chahtane Hicham, Kim Woohyun, Lopez-Molina Luis
Department of Plant Biology and Institute for Genetics and Genomics in Geneva (iGE3), University of Geneva, Geneva, Switzerland.
J Exp Bot. 2017 Feb 1;68(4):857-869. doi: 10.1093/jxb/erw377.
Primary seed dormancy is an important adaptive plant trait whereby seed germination is blocked under conditions that would otherwise be favorable for germination. This trait is found in newly produced mature seeds of many species, but not all. Once produced, dry seeds undergo an aging time period, called dry after-ripening, during which they lose primary dormancy and gradually acquire the capacity to germinate when exposed to favorable germination conditions. Primary seed dormancy has been extensively studied not only for its scientific interest but also for its ecological, phenological, and agricultural importance. Nevertheless, the mechanisms underlying primary seed dormancy and its regulation during after-ripening remain poorly understood. Here we review the principal developmental stages where primary dormancy is established and regulated prior to and during seed after-ripening, where it is progressively lost. We attempt to identify and summarize what is known about the molecular and genetic mechanisms intervening over time in each of these stages.
初级种子休眠是植物的一种重要适应性特征，在此特征下，种子在原本有利于萌发的条件下萌发受到抑制。许多物种新产生的成熟种子都有这种特性，但并非所有物种都有。一旦产生，干燥种子会经历一段老化时期，称为干燥后熟，在此期间它们会失去初级休眠，并在暴露于适宜萌发条件时逐渐获得萌发能力。初级种子休眠不仅因其科学价值受到广泛研究，还因其在生态、物候和农业方面的重要性而备受关注。然而，初级种子休眠及其在后熟过程中的调控机制仍知之甚少。在这里，我们回顾了种子后熟前和后熟期间初级休眠建立和调控的主要发育阶段，在此期间初级休眠会逐渐丧失。我们试图识别并总结每个阶段随着时间推移所涉及的分子和遗传机制。
