Abstract：
Flowering plants adjust their reproductive period to maximize the success of the offspring. Monocarpic plants, those with a single reproductive cycle that precedes plant senescence and death, tightly regulate both flowering initiation and flowering cessation. The end of the flowering period involves the arrest of the inflorescence meristem activity, known as proliferative arrest, in what has been interpreted as an evolutionary adaptation to maximize the allocation of resources to seed production and the viability of the progeny. Factors influencing proliferative arrest were described for several monocarpic plant species many decades ago, but only in the last few years studies performed in Arabidopsis have allowed to approach proliferative arrest regulation in a comprehensive manner by studying the physiology, hormone dynamics, and genetic factors involved in its regulation. However, these studies remain restricted to Arabidopsis and there is a need to expand our knowledge to other monocarpic species to propose general mechanisms controlling the process. In this work, we have characterized proliferative arrest in Pisum sativum, trying to parallel available studies in Arabidopsis to maximize this comparative framework. We have assessed quantitatively the role of fruits/seeds in the process, the influence of the positional effect of these fruits/seeds in the behavior of the inflorescence meristem, and the transcriptomic changes in the inflorescence associated with the arrested state of the meristem. Our results support a high conservation of the factors triggering arrest in pea and Arabidopsis, but also reveal differences reinforcing the need to perform similar studies in other species.
摘要：
开花植物调整其生育期，以最大限度地提高后代的成功。单果植物，那些在植物衰老和死亡之前有单一生殖周期的人，严格调节开花开始和开花停止。开花期的结束涉及花序分生组织活动的停止，被称为增殖停滞，这被解释为一种进化适应，以最大程度地将资源分配给种子生产和后代的生存能力。几十年前，对几种单果植物物种描述了影响增殖停滞的因素，但是仅在最近几年中，在拟南芥中进行的研究才允许通过研究生理学来全面地进行增殖停滞调节，激素动力学，和遗传因素参与其调节。然而,这些研究仍然限于拟南芥，并且有必要将我们的知识扩展到其他单果物种，以提出控制该过程的一般机制。在这项工作中,我们的特征是Pisumsativum的增殖停滞，试图平行拟南芥的可用研究，以最大限度地提高这一比较框架。我们定量评估了水果/种子在这个过程中的作用，这些果实/种子在花序分生组织行为中的位置效应的影响，以及与分生组织停滞状态相关的花序转录组变化。我们的结果支持在豌豆和拟南芥中引发停滞的因素的高度保守性，但也揭示了差异，加强了在其他物种中进行类似研究的需要。
