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首页> 外文期刊>Plant and cell physiology >Circadian Clock- and PIF4-Controlled Plant Growth: A Coincidence Mechanism Directly Integrates a Hormone Signaling Network into the Photoperiodic Control of Plant Architectures in Arabidopsis thaliana
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Circadian Clock- and PIF4-Controlled Plant Growth: A Coincidence Mechanism Directly Integrates a Hormone Signaling Network into the Photoperiodic Control of Plant Architectures in Arabidopsis thaliana

机译：昼夜节律和PIF4控制的植物生长：巧合机制直接将激素信号网络整合到拟南芥植物结构的光周期控制中。

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摘要

The plant circadian clock generates rhythms with a period close to 24 h, and it controls a wide variety of physiological and developmental events, enabling plants to adapt to ever-changing environmental light conditions. In Arabidopsis thaliana, the clock regulates the diurnal and photoperiodic plant growth including the elongation of hypocotyls and petioles in a time-of-day-specific and short-day (SD)-specific manner. In this mechanism, the clock-regulated PHYTOCHROME-INTERACTING FACTOR 4 gene encoding a basic helix-loop-helix transcription factor, together with phytochromes (mainly phyB), plays crucial roles. This diurnal and photoperiodic control of plant growth is best explained by the accumulation of the PIF4 protein at the end of the night-time specifically under SDs, due to coincidence between the internal (circadian rhythm) and external (photoperiod) cues. In this model, however, the PIF4-controlled downstream factors are not fully identified, although it has been generally proposed that the auxin-mediated signal transduction is crucially implicated. Here, we identified a set of hormone-associated genes as the specific PIF4 targets implicated in the photoperiodic control of plant growth. They include not only auxin-associated genes (GH3.5, IAA19 and IAA29), but also genes associated with other growth-regulating hormones such as brassinosteroids (BR6ox2), gibberellic acids (GAI), ethylene (ACS8) and cytokinin (CKX5). The dawn- and SD-specific expression profiles of these genes are modified in a set of phyB and clock mutants, both of which compromise the coincidence mechanism. The results of this study suggest that the circadian clock orchestrates a variety of hormone signaling pathways to regulate the photoperiod-dependent morphogenesis in A. thaliana.
机译：植物昼夜节律时钟的周期接近24小时，可以控制各种生理和发育事件，使植物能够适应不断变化的环境光照条件。在拟南芥中，时钟以特定于一天的时间和特定于短期（SD）的方式调节昼夜和光周期植物的生长，包括下胚轴和叶柄的伸长。在这种机制中，编码基本螺旋-环-螺旋转录因子以及植物色素（主要是phyB）的时钟调节的PHYTOCHROME-INTERACTING FACTOR 4基因起着至关重要的作用。由于内部（昼夜节律）和外部（光周期）提示之间的重合，PIF4蛋白在夜间的结束，特别是在SD下，可以很好地解释这种植物生长的昼夜和光周期控制。然而，在该模型中，尽管已普遍提出生长素介导的信号转导至关重要，但并未完全确定PIF4控制的下游因素。在这里，我们确定了一组与激素相关的基因，作为与植物生长的光周期控制有关的特定PIF4靶标。它们不仅包括生长素相关基因（GH3.5，IAA19和IAA29），而且还包括与其他生长调节激素相关的基因，例如油菜素甾醇（BR6ox2），赤霉素（GAI），乙烯（ACS8）和细胞分裂素（CKX5） 。这些基因的黎明和SD特异表达谱在一组phyB和Clock突变体中被修饰，两者都损害了巧合机制。这项研究的结果表明昼夜节律时钟编排各种激素信号通路来调节拟南芥光周期依赖的形态发生。

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