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Epigenetic reprogramming drives the annual growth–dormancy cycle in Populus 表观遗传重编程驱动了杨树的年度生长-休眠周期
Pub Date : 2026-01-30 DOI: 10.1093/plcell/koag018
Yue Li, Xintong Xu, Kejing Wang, Zhenzhu Hu, Li Deng, Zhimin Zheng, Xiaokang Dai, Jihua Ding
The seasonal growth–dormancy cycle is a critical adaptive trait that enables perennials from boreal and temperate regions to survive winter. This cycle is largely governed by spatiotemporal gene activity in the shoot apex, where chromatin states dynamically respond to seasonal environmental cues. However, the chromatin regulatory mechanisms underlying this response remain poorly understood. Here, we characterize chromatin dynamics in Populus shoot meristems across five key stages of the annual growth–dormancy cycle. By integrating data on chromatin accessibility, histone modifications, and transcriptomic dynamics, we reveal stage-specific and distinct (proximal–distal) chromatin reprogramming events that closely align with transcriptomic changes. We further demonstrate that deposition of the repressive histone mark H3K27me3 by the Polycomb Repressive Complex 2 plays a vital role in regulating growth–dormancy transitions. Manipulation of Populus LIKE HETEROCHROMATIN PROTEIN 1 (PtLHP1) expression alters dormancy release and bud break in hybrid poplar. PtLHP1 extensively co-localized with H3K27me3-marked chromatin regions, supporting its role in maintaining H3K27me3 homeostasis during seasonal transitions. Our study provides a comprehensive epigenetic landscape of seasonal growth regulation in trees and identifies potential molecular targets for understanding the mechanisms underlying phenological plasticity.
季节性生长-休眠周期是一个关键的适应特征,使来自北方和温带地区的多年生植物能够在冬季生存。这个循环在很大程度上是由茎尖的时空基因活动控制的,在茎尖染色质状态动态响应季节环境线索。然而,这种反应背后的染色质调控机制仍然知之甚少。在这里,我们描述了杨树芽分生组织在每年生长-休眠周期的五个关键阶段的染色质动力学。通过整合染色质可及性、组蛋白修饰和转录组动力学的数据,我们揭示了与转录组变化密切相关的阶段特异性和不同的(近端-远端)染色质重编程事件。我们进一步证明,Polycomb抑制复合体2沉积的抑制组蛋白标记H3K27me3在调节生长-休眠转变中起着至关重要的作用。调控杨树LIKE异染色质蛋白1 (PtLHP1)表达改变杂交杨树休眠释放和芽断。PtLHP1广泛地与H3K27me3标记的染色质区域共定位,支持其在季节转换期间维持H3K27me3稳态的作用。我们的研究提供了树木季节性生长调控的综合表观遗传景观,并为理解物候可塑性的机制确定了潜在的分子靶点。
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引用次数: 0
CONSTANS-LIKE 5 facilitates flower opening and scent biosynthesis in Solanaceae. 在茄科植物中,CONSTANS-LIKE 5促进花的开放和气味的生物合成。
Pub Date : 2026-01-29 DOI: 10.1093/plcell/koag016
Yuri Choi,Moonyoung Kang,Hyeonjin Kim,Taein Kim,Eunae Park,Jumi Kim,Hyunwoo Kim,Hyejung Yun,Hangah Lim,Youngbin Oh,Giltsu Choi,Sang-Gyu Kim
Flowers of the coyote tobacco (Nicotiana attenuata) exhibit a distinct diurnal rhythm: they open at night, close the following morning, and repeat this movement over two days, synchronized with nighttime scent emission. While circadian clock components like LATE ELONGATED HYPOCOTYL (LHY) and ZEITLUPE (ZTL) are known to regulate floral rhythms in N. attenuata, the molecular mechanism underlying these processes remains largely unknown. Here, we identify the transcription factor CONSTANS-LIKE 5 (COL5) as a key regulator of flower opening and scent emission in N. attenuata and the large white petunia (Petunia axillaris). We screened for genes in N. attenuata corolla displaying (1) diurnal rhythms, (2) altered expression in ZTL mutants, and (3) co-regulation with EMISSION OF BENZENOIDS II. Using this multifaceted strategy, we found that col5 mutants exhibited incomplete flower opening and lacked emission of the major floral scent, benzylacetone, without affecting overall plant growth and floral development. Silencing the orthologous gene in P. axillaris produced similar phenotypes, confirming a conserved role for COL5 in facilitating flower opening and scent emission. These results demonstrate that COL5 coordinates circadian-regulated floral rhythms, advancing our understanding of the molecular basis underlying floral rhythms.
土狼烟草(Nicotiana attenuata)的花表现出独特的昼夜节律:它们在晚上开放,第二天早上关闭,并在两天内重复这一运动,与夜间气味的释放同步。虽然已知晚拉长下胚轴(LATE ELONGATED HYPOCOTYL, LHY)和ZEITLUPE (ZEITLUPE, ZTL)等昼夜节律时钟成分调节华北花的节律,但这些过程的分子机制仍不清楚。在此,我们发现转录因子CONSTANS-LIKE 5 (COL5)是华北矮牵牛(N. attenuata)和大白矮牵牛(petunia axillaris)开花和气味释放的关键调节因子。我们筛选了薄叶菊花冠中显示(1)昼夜节律的基因,(2)ZTL突变体表达改变的基因,以及(3)与苯类化合物II的发射共调控的基因。利用这种多方面的策略,我们发现col5突变体开花不完全,缺乏主要花香味苯丙酮的释放,但不影响植物的整体生长和花的发育。在紫苏中沉默同源基因产生了类似的表型,证实了COL5在促进花开放和气味释放方面的保守作用。这些结果表明,COL5协调昼夜调节的花节律,促进了我们对花节律的分子基础的理解。
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引用次数: 0
The chloroplast ionome shines light on the dynamics of organellar iron homeostasis 叶绿体离子单体揭示了细胞器铁稳态的动力学
Pub Date : 2026-01-28 DOI: 10.1093/plcell/koag017
Lorenz J Holzner, Lucia Östergaard Frank, Susanne Mühlbauer, Anna Müller, Laura Schröder, Charlotte Seydel, Jennifer Grünert, Rachael A DeTar, Katrin Philippar, Andreas Klingl, David Mendoza-Cózatl, Ute Krämer, Thomas Nägele, Bettina Bölter, Hans-Henning Kunz
Annually, chloroplasts fix 258 billion tons of CO2 through photosynthesis. Photosynthesis and other biochemical pathways require specific amounts of metal ions in the organelle. Transport proteins in the plastid inner envelope maintain the organellar ion homeostasis. Despite substantial progress over the last decades, many genes encoding plastid ion channels and ion carriers or their regulators remain unknown. To fill this knowledge gap, detailed information on the elemental composition of chloroplasts i.e., a plastid ionome, is needed. This will allow us to compare mutants of transporter candidates with wild-type plants. Here, we provide quantitative descriptions of chloroplast ionomes from Arabidopsis thaliana, the metal hyperaccumulator Arabidopsis halleri, Pisum sativum, and Nicotiana benthamiana and analyze similarities and distinctions. Using A. thaliana, we show that plastid ionomes can be genetically manipulated. Chloroplasts of OLIGOPEPTIDE TRANSPORTER3 (OPT3)-deficient mutants contain 14-fold more iron, likely associated with stromal FERRITIN. The removal of FERRITIN in opt3 mutants leads to a substantial decrease in plastid and leaf iron, pointing to an important role of ferritins in shaping the chloroplast ionome. Our study reveals that chloroplast ferritins can be turned into iron sinks. Since crop biofortification to fight hidden hunger has become a global mission, this research provides groundwork to reach this goal.
每年,叶绿体通过光合作用固定2580亿吨二氧化碳。光合作用和其他生化途径需要细胞器中一定量的金属离子。质体内膜中的转运蛋白维持细胞器离子稳态。尽管在过去的几十年里取得了实质性的进展,但许多编码质体离子通道和离子载体或其调节因子的基因仍然未知。为了填补这一知识空白,需要有关叶绿体元素组成的详细信息,即质体离体。这将使我们能够将候选转运体突变体与野生型植物进行比较。本文对拟南芥(拟南芥)、金属超积累植物拟南芥(拟南芥)、沙豆(Pisum sativum)和烟(Nicotiana benthamiana)的叶绿体离子组进行了定量描述,并分析了它们的异同。利用拟南芥,我们展示了质体离子组可以被基因操纵。OLIGOPEPTIDE TRANSPORTER3 (OPT3)缺陷突变体的叶绿体含有14倍以上的铁,可能与基质铁蛋白有关。在opt3突变体中,铁蛋白的去除导致质体和叶铁的大量减少,这表明铁蛋白在叶绿体离子单体的形成中起着重要作用。我们的研究表明,叶绿体铁蛋白可以转化为铁汇。由于作物生物强化对抗隐性饥饿已成为一项全球性任务,本研究为实现这一目标提供了基础。
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引用次数: 0
RNA polymerase: Allosteric regulation and cooperativity of nucleoside triphosphate binding sites in transcription - a long, drawn-out story. RNA聚合酶:转录中三磷酸核苷结合位点的变构调控和协同性-一个漫长的故事。
Pub Date : 2026-01-28 DOI: 10.1093/plcell/koag015
Klaus Grossmann
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引用次数: 0
Ironing out the details: Fe homeostasis in the shoot and root is regulated by distinct actions of BTS/BTSL1/2 and bHLH IVc subgroup transcription factors. 澄清细节:铁在茎部和根部的稳态受BTS/BTSL1/2和bHLH IVc亚群转录因子的不同作用调控。
Pub Date : 2026-01-24 DOI: 10.1093/plcell/koag012
Nataliia Konstantinova
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引用次数: 0
Membrane-associated DELLA degradation modulates growth under carbon/nitrogen imbalance. 膜相关的DELLA降解调节碳/氮不平衡下的生长。
Pub Date : 2026-01-24 DOI: 10.1093/plcell/koag013
Gerardo Carrera-Castaño,Iris Fañanás-Pueyo,Laura Celada-Bustillos,Julián Calleja-Cabrera,Héctor Molinelli-Rubiato,Ángela Contreras,Jan Eric Maika,Rüdiger Simon,Mónica Pernas,Luis Gómez,Luis Oñate-Sánchez
Crop yield and sustainability rely on the ability of plants to perceive and efficiently use nutrients. When high carbon (C) to nitrogen (N) ratios are perceived, plants trigger a specific response leading to reduced growth and enhanced anthocyanin accumulation. Here, using (Arabidopsis thaliana), we provide genetic, molecular and physiological evidence supporting a role for DELLA proteins to control growth under C/N stress through a non-nuclear mechanism that regulates their stability. C/N stress response specifically requires the RGA (REPRESSOR OF ga1-3 1) and GAI (GIBBERELLIC ACID INSENSITIVE) DELLA proteins, whose stability is reduced by a membrane-associated mechanism independent of the canonical gibberellic acid (GA)-GID1 (GIBBERELLIN INSENSITIVE DWARF1) pathway. Although C/N stress enhances DELLA accumulation by reducing GA levels, it also promotes their ubiquitination and degradation via interaction with the ATL31 E3-ligase at the membrane, even in the absence of GAs or when GA-resistant alleles are used. Moreover, phenotypic traits known to be altered by DELLA levels are not affected by enhanced ATL31 expression in the absence of stress. We propose that this mechanism fine-tunes DELLA-mediated C/N stress responses without adverse effects on plant development.
作物的产量和可持续性依赖于植物感知和有效利用养分的能力。当感知到高碳(C)氮(N)比时,植物会触发一种特定的反应,导致生长减少和花青素积累增加。本研究利用拟南芥(Arabidopsis thaliana)提供遗传、分子和生理证据,支持DELLA蛋白通过调节其稳定性的非核机制控制C/N胁迫下的生长。C/N胁迫反应特别需要RGA (ga1-3 - 1阻滞剂)和GAI(赤霉素不敏感)DELLA蛋白,其稳定性通过独立于经典赤霉素(GA)-GID1(赤霉素不敏感的DWARF1)途径的膜相关机制而降低。尽管C/N胁迫通过降低GA水平促进DELLA积累,但即使在没有GA或使用抗GA等位基因时,也可以通过与膜上的ATL31 e3连接酶相互作用促进其泛素化和降解。此外,已知由DELLA水平改变的表型性状在没有应激的情况下不受ATL31表达增强的影响。我们认为这一机制对della介导的C/N胁迫反应进行微调,而不会对植物发育产生不利影响。
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引用次数: 0
Sec62 restricts ER-replicating positive-strand RNA virus infections via UPR-dependent ER-phagy Sec62通过upr依赖性er吞噬限制er复制正链RNA病毒感染
Pub Date : 2026-01-23 DOI: 10.1093/plcell/koag014
Ruiqi Wang, Qianshen Zhang, Lifan Zhou, Dingliang Zhang, Yiping Wang, Xinyu Zhang, Xiuling Cao, Chenchen Zhong, Xiaofei Zhao, Meng Yang, Dawei Li, Xiaofeng Wang, Yongliang Zhang
Positive-strand RNA [(+)RNA] viruses induce endomembrane remodeling to form viral replication organelles (VROs), which disrupt organelle homeostasis. How hosts restore organelle homeostasis and how these responses influence viral replication remain elusive. Using beet black scorch virus (BBSV), a (+)RNA virus that replicates on the endoplasmic reticulum (ER) and induces severe deformation of ER membranes, as a model in Nicotiana benthamiana, we demonstrated that BBSV induces ER-phagy, primarily mediated by its auxiliary replication protein p23. p23 interacts with the ER-phagy receptor NbSec62, with phenylalanine at position 48 being critical for this interaction and ER-phagy induction. Upon BBSV infection, the unfolded protein response (UPR) is triggered to promote viral replication. However, the activation of the UPR also induces NbSec62-mediated ER-phagy to suppress BBSV replication. Furthermore, NbSec62 restricts other ER-replicating (+)RNA viruses, including tobacco mosaic virus and turnip mosaic virus. Our findings reveal NbSec62 as a restriction factor that interacts with BBSV VROs to regulate the balance of viral replication and ER homeostasis, providing insights into the UPR–ER-phagy signaling network in virus–host interactions.
正链RNA [(+)RNA]病毒诱导膜重塑形成病毒复制细胞器(VROs),破坏细胞器的稳态。宿主如何恢复细胞器稳态以及这些反应如何影响病毒复制仍然是一个谜。我们利用甜菜黑焦病毒(BBSV),一种在内质网(ER)上复制并诱导内质网膜严重变形的(+)RNA病毒,作为本烟(Nicotiana benthamiana)的模型,证明了BBSV诱导ER吞噬,主要由其辅助复制蛋白p23介导。p23与er吞噬受体NbSec62相互作用,48位的苯丙氨酸对这种相互作用和er吞噬诱导至关重要。感染BBSV后,会触发未折叠蛋白反应(UPR),促进病毒复制。然而,UPR的激活也诱导nbsec62介导的er吞噬抑制BBSV复制。此外,NbSec62还能抑制其他er复制(+)RNA病毒,包括烟草花叶病毒和萝卜花叶病毒。我们的研究结果揭示了NbSec62作为一个限制性因子,与BBSV VROs相互作用,调节病毒复制和内质网稳态的平衡,为病毒-宿主相互作用中upr - ER吞噬信号网络的研究提供了新的思路。
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引用次数: 0
Beyond sequences: Structure-guided discovery of novel protein functions in plants. 超越序列:结构引导下植物新蛋白功能的发现。
Pub Date : 2026-01-20 DOI: 10.1093/plcell/koag009
Crispus M Mbaluto
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引用次数: 0
Acidification of the battlefield: How Pst manipulates apoplastic pH homeostasis to promote stripe rust disease in wheat. 战场酸化:Pst如何操纵胞外pH稳态促进小麦条锈病。
Pub Date : 2026-01-17 DOI: 10.1093/plcell/koag010
Margot Raffeiner
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引用次数: 0
The KLU-PRE module provides positional cues that maintain somatic cell identity around the megasporocyte cell in Arabidopsis. KLU-PRE模块提供位置线索,维持拟南芥大孢子母细胞周围的体细胞身份。
Pub Date : 2026-01-16 DOI: 10.1093/plcell/koag008
Hanyang Cai,Youmei Huang,Liping Liu,Han Su,Xinpeng Xi,Yanfen Liu,Thomas Dresselhaus,Yuan Qin
In most flowering plants, a single hypodermal cell from the ovule primordium differentiates into the megaspore mother cell (MMC) to initiate the female germline. However, how positional cues maintain this cell identity remains unclear. Here, we report that in Arabidopsis (Arabidopsis thaliana), the basic helix-loop-helix transcription factor genes PACLOBUTRAZOL RESISTANCE 1 (PRE1) and PRE2/3/5/6 (referred to as PREs), are expressed in the distal nucellus domain of ovule primordia. PRE proteins accumulate near the chalaza region of the ovule primordia, where the cytochrome P450 gene KLU (KLUH/CYP78A5)is also expressed. Ectopic expression of PREs driven by the KLU promoter or misexpression of KLU in the distal end of the ovule primordia caused the development of extra MMC-like cells. In the klu mutant, PRE protein localization extended towards the inner integument primordia and chalaza region. KLU physically interacts with PREs depending on the PRE M8 motif. The transcription factor BRASSINAZOLE-RESISTANT1 (BZR1) directly targets the PRE and KLU promoters and is expressed in all ovule primordia cells except the MMC. BZR1 physically interacts with SWR1 COMPLEX 6 (SWC6), and together they affect the chromatin state at PRE loci. In summary, the KLU-PRE module integrates brassinosteroid signaling with chromatin remodeling to establish positional cues that restrict MMC differentiation and female germline initiation to a single cell in Arabidopsis.
在大多数开花植物中,来自胚珠原基的单个下皮细胞分化成大孢子母细胞(MMC),从而产生雌性生殖系。然而,位置线索如何维持这种细胞身份仍不清楚。本文报道了在拟南芥(Arabidopsis thaliana)中,基本的螺旋-环-螺旋转录因子基因PACLOBUTRAZOL RESISTANCE 1 (PRE1)和PRE2/3/5/6 (PREs)在胚珠原基远心区表达。PRE蛋白聚集在胚珠原基的合带区附近,细胞色素P450基因KLU (KLUH/CYP78A5)也在此表达。由KLU启动子驱动的PREs异位表达或KLU在胚珠原基远端错误表达导致额外的mmc样细胞发育。在klu突变体中,PRE蛋白定位向内被原基和链区延伸。KLU根据PRE M8基序与PRE发生物理相互作用。转录因子BRASSINAZOLE-RESISTANT1 (BZR1)直接靶向PRE和KLU启动子,在除MMC外的所有胚珠原基细胞中均有表达。BZR1与SWR1 COMPLEX 6 (SWC6)相互作用,共同影响PRE位点的染色质状态。总之,KLU-PRE模块整合了油菜素类固醇信号和染色质重塑,建立了限制拟南芥MMC分化和雌性种系起始到单个细胞的位置线索。
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引用次数: 0
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The Plant Cell
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