共查询到18条相似文献,搜索用时 109 毫秒
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Sensing environmental changes and initiating a gene expression response are important for plants as sessile autotrophs. The ability of epigenetic status to alter rapidly and reversibly could be a key component to the flexibility of plant responses to the environment. The involvement of epigenetic mechanisms in the response to environmental cues and to different types of abiotic stresses has been documented. Different environmental stresses lead to altered methylation status of DNA as well as modifications of nucleosomal histones. Understanding how epigenetic mechanisms are involved in plant response to environmental stress is highly desirable, not just for a better understanding of molecular mechanisms of plant stress response but also for possible application in the genetic manipulation of plants. In this review, we highlight our current understanding of the epigenetic mechanisms of chromatin modifications and remodeling, with emphasis on the roles of specific modification enzymes and remodeling factors in plant abiotic stress responses. This article is part of a Special Issue entitled: Plant gene regulation in response to abiotic stress. 相似文献
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Plants have developed intricate mechanisms involving gene regulatory systems to adjust to stresses. Phenotypic variation in plants under stress is classically attributed to DNA sequence variants. More recently, it was found that epigenetic modifications - DNA methylation-, chromatin- and small RNA-based mechanisms - can contribute separately or together to phenotypes by regulating gene expression in response to the stress effect. These epigenetic modifications constitute an additional layer of complexity to heritable phenotypic variation and the evolutionary potential of natural plant populations because they can affect fitness. Natural populations can show differences in performance when they are exposed to changes in environmental conditions, partly because of their genetic variation but also because of their epigenetic variation. The line between these two components is blurred because little is known about the contribution of genotypes and epigenotypes to stress tolerance in natural populations. Recent insights in this field have just begun to shed light on the behavior of genetic and epigenetic variation in natural plant populations under biotic and abiotic stresses. This article is part of a Special Issue entitled: Plant gene regulation in response to abiotic stress. 相似文献
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植物扎根土壤,面对不利的环境胁迫无法逃避。然而,植物已经进化出对环境胁迫的记忆(stress memory)与警备抗性(或防御警备defense priming)等机制适应环境。环境胁迫在短时间内无法改变植物的DNA碱基序列,因此表观遗传被认为是植物对环境胁迫产生记忆和产生防御警备的主要机制,而组蛋白修饰被认为是最重要的机制,为胁迫记忆提供了可能。本文综述了非生物和生物胁迫下植物分别以胁迫记忆和防御警备机制为主导的组蛋白修饰参与抵御不良环境的最新进展,并提出该研究领域存在的问题和今后研究的重点与方向。深入探究组蛋白修饰与植物适应环境胁迫的关系,可为提高植物抗性、植物表型塑造、器官再生和作物改良等方面提供理论和技术指导。 相似文献
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Epigenetic regulation in plant abiotic stress responses 总被引:2,自引:0,他引:2
Ya‐Nan Chang Chen Zhu Jing Jiang Huiming Zhang Jian‐Kang Zhu Cheng‐Guo Duan 《植物学报(英文版)》2020,62(5):563-580
In eukaryotic cells, gene expression is greatly influenced by the dynamic chromatin environment. Epigenetic mechanisms, including covalent modifications to DNA and histone tails and the accessibility of chromatin, create various chromatin states for stress‐responsive gene expression that is important for adaptation to harsh environmental conditions. Recent studies have revealed that many epigenetic factors participate in abiotic stress responses, and various chromatin modifications are changed when plants are exposed to stressful environments. In this review, we summarize recent progress on the cross‐talk between abiotic stress response pathways and epigenetic regulatory pathways in plants. Our review focuses on epigenetic regulation of plant responses to extreme temperatures, drought, salinity, the stress hormone abscisic acid, nutrient limitations and ultraviolet stress, and on epigenetic mechanisms of stress memory. 相似文献
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DNA methylation and histone modification are evolutionarily conserved epigenetic modifications that are crucial for the expression regulation of abiotic stress-responsive genes in plants. Dynamic changes in gene expression levels can result from changes in DNA methylation and histone modifications. In the last two decades, how epigenetic machinery regulates abiotic stress responses in plants has been extensively studied. Here, based on recent publications, we review how DNA methylation and histone modifications impact gene expression regulation in response to abiotic stresses such as drought, abscisic acid, high salt, extreme temperature, nutrient deficiency or toxicity, and ultraviolet B exposure. We also review the roles of epigenetic mechanisms in the formation of transgenerational stress memory. We posit that a better understanding of the epigenetic underpinnings of abiotic stress responses in plants may facilitate the design of more stress-resistant or -resilient crops, which is essential for coping with global warming and extreme environments. 相似文献
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The study of abiotic stress response of plants is important because they have to cope with environmental changes to survive. The plant genomes have evolved to meet environmental challenges. Salt, temperature, and drought are the main abiotic stresses. The tolerance and response to stress vary differently in plants. The idea was to analyze the genes showing differential expression under abiotic stresses. There are many pathways connecting the perception of external stimuli to cellular responses. In plants, these pathways play an important role in the transduction of abiotic stresses. In the present study, the gene expression data have been analyzed for their involvement in different steps of signaling pathways. The conserved genes were analyzed for their role in each pathway. The functional annotations of these genes and their response under abiotic stresses in other plant species were also studied. The enzymes of signal pathways, showing similarity with conserved genes, were analyzed for their role in different abiotic stresses. Our findings will help to understand the expression of genes in response to various abiotic stresses. These genes may be used to study the response of different abiotic stresses in other plant species and the molecular basis of stress tolerance. 相似文献
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类受体蛋白激酶(receptor-like protein kinase,RLK)是植物信号转导网络中的重要成员,参与介导生长、发育以及逆境胁迫应答等多种细胞代谢过程.在植物细胞中已发现和克隆了富含亮氨酸重复区型(LRR)、凝集素型(lectin-like)和细胞壁相联型(WAK)等不同的RLK亚家族.这些RLK能够感受多种发育和外界环境胁迫信号, 并在植物对非生物胁迫的响应过程中发挥重要的调控作用.本文结合当今国内外研究进展,简述植物RLK的典型结构域特征,详细介绍多种RLK在植物逆境信号识别与转导中发挥的作用,同时对RLK在非生物胁迫应答中的具体作用机制进行了探讨. 相似文献