Abscisic Acid: Metabolism, Transport and Signaling
Abscisic Acid: Metabolism, Transport and Signaling
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DOI：
10.1007/978-94-017-9424-4
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Da-Peng Zhang
中科院分区：
文献类型：
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作者：
Da-Peng Zhang
植物使用内源和环境线索来触发开花。虽然日长和温度的变化在控制向开花的过渡过程中发挥了重要作用，但人们对水分胁迫产生的信号知之甚少。干旱条件导致各种植物提早开花。由于众所周知，干旱条件也会刺激脱落酸(ABA)的积累，ABA信号可能是观察到的早花反应的基础。实验表明，外源ABA会引起开花时间的改变，这表明ABA可能是影响花过渡的内源成分。为了证实内源ABA在开花中的作用，在ABA生产中受损的突变体表现出开花变化，尽管对于ABA在植物中的确切作用方式缺乏共识。ABA在几种植物中激活开花，在拟南芥中它促进关键的花基因T的激活。然而，ABA信号如何整合到花网络中仍然知之甚少。本文综述的证据表明，ABA激活了包括转录因子在内的一个复杂的信号网络，在开花过程中的作用截然不同。这些ABA-光周期相互作用信号基因的损伤会在开花过程中产生变化，但到目前为止，它们的调控和作用部位一直难以捉摸。ABA主要被认为是一种应激激素，它在开花中的作用才刚刚开始显现。在这一章中，我们将回顾支持和反对ABA控制花朵过渡的证据。
Plants use endogenous and environmental cues to trigger flowering. While variations in day length and temperature play a major role in controlling the transition to flowering, little is known about water stress-derived signals. Drought conditions cause early flowering in various plant species. Since it is well recognized that drought conditions also stimulate abscisic acid (ABA) accumulation, ABA signalling might underpin the observed early flowering response. Experiments have shown that exogenous applications of ABA cause flowering time alterations, suggesting that ABA might be an endogenous component affecting the floral transition. Confirming a role for endogenous ABA in flowering, mutants impaired in ABA production display flowering alterations, although a consensus as to the precise mode of action of ABA in plants is lacking. ABA activates flowering in several plant species and in Arabidopsis it promotes activation of the key floral geneFLOWERING LOCUS T. However, how ABA signalling is integrated in the floral network remains poorly understood. The evidence reviewed here suggests that ABA activates a complex network of signalling components including transcription factors with contrasting effects in flowering. Lesions in these ABA-Photoperiod interaction signalling genes produce alterations in flowering but their regulation and site of action have been so far elusive. ABA is mainly known as a stress hormone and its role in flowering is only beginning to emerge. In this chapter we will review the evidence for and against ABA controlling the floral transition.