Perception of vegetation proximity or plant shade informs of potential competition for resources by the neighboring vegetation. As vegetation proximity impacts on both light quantity and quality, perception of this cue by plant photoreceptors reprograms development to result in responses that allow plants to compete with the neighboring vegetation. Developmental reprogramming involves massive and rapid changes in gene expression, with the concerted action of photoreceptors and downstream transcription factors. Changes in gene expression can be modulated by epigenetic processes that alter chromatin compaction, influencing the accessibility and binding of transcription factors to regulatory elements in the DNA. However, little is known about the epigenetic regulation of plant responses to the proximity of other plants. In this manuscript, we review what is known about plant shade effects on chromatin changes at the cytological level, that is, changes in nuclear morphology and high order chromatin density. We address which are the specific histone post-transcriptional modifications that have been associated with changes in shade-regulated gene expression, such as histone acetylation and histone methylation. Furthermore, we explore the possible mechanisms that integrate shade signaling components and chromatin remodelers to settle epigenetic marks at specific loci. This review aims to be a starting point to understand how a specific environmental cue, plant shade, integrates with chromatin dynamics to implement the proper acclimation responses. This article is protected by copyright. All rights reserved.

中文翻译：

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揭示调节阴影反应的染色质变化

对植被接近度或植物遮荫的感知告知邻近植被对资源的潜在竞争。由于植被接近度对光量和质量都有影响，植物光感受器对这一线索的感知会重新编程发育，从而产生允许植物与邻近植被竞争的反应。发育重编程涉及基因表达的大量快速变化，以及光感受器和下游转录因子的协同作用。基因表达的变化可以通过改变染色质压实的表观遗传过程进行调节，从而影响转录因子与 DNA 中调控元件的可及性和结合。然而，关于植物对其他植物邻近反应的表观遗传调控知之甚少。在这份手稿中，我们回顾了在细胞学水平上植物遮荫对染色质变化的影响，即核形态和高阶染色质密度的变化。我们解决了与阴影调节基因表达变化相关的特定组蛋白转录后修饰，例如组蛋白乙酰化和组蛋白甲基化。此外，我们探索了整合阴影信号成分和染色质重塑剂以在特定位点确定表观遗传标记的可能机制。本综述旨在成为了解特定环境线索、植物阴影如何与染色质动力学相结合以实施适当的适应反应的起点。本文受版权保护。版权所有。