Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing, China.
J Exp Bot. 2018 Feb 12;69(4):719-732. doi: 10.1093/jxb/ery009.
Flowers are highly complex organs that have evolved to enhance the reproductive success of angiosperms. As a key component of flowers, petals play a vital role in attracting pollinators and ensuring successful pollination. Having fulfilled this function, petals senesce through a process that involves many physiological and biochemical changes that also occur during leaf senescence. However, petal senescence is distinct, due to the abundance of secondary metabolites in petals and the fact that petal senescence is irreversible. Various phytohormones are involved in regulating petal senescence, and are thought to act both synergistically and antagonistically. In this regard, there appears to be developmental point during which such regulatory signals are sensed and senescence is initiated. Here, we review current understanding of petal senescence, and discuss associated regulatory mechanisms involving hormone interactions and epigenetic regulation.
花是高度复杂的器官，它们已经进化到可以增强被子植物的生殖成功率。作为花的一个关键组成部分，花瓣在吸引传粉者和确保成功授粉方面发挥着至关重要的作用。完成这一功能后，花瓣通过一个涉及许多生理和生化变化的过程衰老，这些变化也发生在叶片衰老过程中。然而，由于花瓣中次生代谢物的丰富，以及花瓣衰老不可逆转的事实，花瓣衰老具有独特性。各种植物激素参与调节花瓣衰老，并且被认为是协同和拮抗作用的。在这方面，似乎存在一个发育关键点，在这个关键点上，这些调节信号被感知，衰老开始。在这里，我们回顾了花瓣衰老的最新理解，并讨论了涉及激素相互作用和表观遗传调控的相关调节机制。
