Abiotic stresses are non-living factors with negative morphological and physiological effects on living organisms. Substantial evidence exists that gene expression changes during plant cell growth are regulated by chromatin reconfiguration and histone modification. Several types of histone modifications are dramatically transformed in stress-responsive gene regions under drought stress conditions. Environmental stresses also cause the root apical meristem (RAM) region to decelerate root growth. In this study, we investigated how quantitative changes in epigenetic markers in this region influence rice morphology and physiology. Both iron and salinity treatments changed the epigenetic landscape from euchromatic to heterochromatic according to heterochromatin (H3K9me2) and euchromatin (H3K4me) markers, especially in the proximal meristem region. Moreover, supplementation with external abscisic acid (ABA) was able to mimic the effect of environmental stresses on global epigenetic changes. In contrast, the addition of external auxin (IAA) to rice under saline conditions affected heterochromatin formation without influencing euchromatin transformation. Chromatin dynamics is therefore believed to be directly connected to plant growth regulator signaling. We discuss insights into the role of plant growth regulators: ABA and IAA, peroxide signaling, and their effects on the global epigenetic change of histone modification under abiotic stresses.

中文翻译：

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水稻根系环境胁迫下组蛋白修饰的全球表观遗传变化。

非生物胁迫是对生命有机体具有负面形态和生理影响的非生物因素。大量证据表明，植物细胞生长过程中的基因表达变化受染色质重整和组蛋白修饰的调控。在干旱胁迫条件下，几种类型的组蛋白修饰会在应激反应基因区域发生显着转化。环境压力还会导致根尖分生组织（RAM）区域减慢根的生长。在这项研究中，我们调查了该区域表观遗传标记的定量变化如何影响水稻的形态和生理。铁和盐分处理都根据异染色质（H3K9me2）和常染色质（H3K4me）标记，特别是在近端分生组织区域，将表观遗传景观从常色变为异色。此外，补充外部脱落酸（ABA）能够模拟环境胁迫对全球表观遗传变化的影响。相反，在盐水条件下向水稻中添加外部生长素（IAA）会影响异染色质的形成，而不会影响常染色质的转化。因此，染色质动力学被认为与植物生长调节剂信号直接相关。我们讨论了对植物生长调节剂的作用的见解：ABA和IAA，过氧化物信号及其在非生物胁迫下对组蛋白修饰的全球表观遗传变化的影响。在盐水条件下向水稻中添加外部生长素（IAA）会影响异染色质的形成，而不会影响常染色质的转化。因此，染色质动力学被认为与植物生长调节剂信号直接相关。我们讨论了对植物生长调节剂的作用的见解：ABA和IAA，过氧化物信号及其在非生物胁迫下对组蛋白修饰的全球表观遗传变化的影响。在盐水条件下向水稻中添加外部生长素（IAA）会影响异染色质的形成，而不会影响常染色质的转化。因此，染色质动力学被认为与植物生长调节剂信号直接相关。我们讨论了对植物生长调节剂的作用的见解：ABA和IAA，过氧化物信号及其在非生物胁迫下对组蛋白修饰的全球表观遗传变化的影响。