keyword
https://read.qxmd.com/read/36251728/a-potential-early-flowering-3-homolog-in-chlamydomonas-is-involved-in-the-red-violet-and-blue-light-signaling-pathways-for-the-degradation-of-rhythm-of-chloroplast-15
#1
JOURNAL ARTICLE
Malavika Gururaj, Ayumi Ohmura, Mariko Ozawa, Takashi Yamano, Hideya Fukuzawa, Takuya Matsuo
Light plays a major role in resetting the circadian clock, allowing the organism to synchronize with the environmental day and night cycle. In Chlamydomonas the light-induced degradation of the circadian clock protein, RHYTHM OF CHLOROPLAST 15 (ROC15), is considered one of the key events in resetting the circadian clock. Red/violet and blue light signals have been shown to reach the clock via different molecular pathways; however, many of the participating components of these pathways are yet to be elucidated...
October 17, 2022: PLoS Genetics
https://read.qxmd.com/read/36111879/glucose-6-p-phosphate-translocator2-mediates-the-phosphoglucose-isomerase1-independent-response-to-microbial-volatiles
#2
JOURNAL ARTICLE
Samuel Gámez-Arcas, Francisco José Muñoz, Adriana Ricarte-Bermejo, Ángela María Sánchez-López, Marouane Baslam, Edurne Baroja-Fernández, Abdellatif Bahaji, Goizeder Almagro, Nuria De Diego, Karel Doležal, Ondřej Novák, Jesús Leal-López, Rafael Jorge León Morcillo, Araceli G Castillo, Javier Pozueta-Romero
In Arabidopsis (Arabidopsis thaliana), the plastidial isoform of phosphoglucose isomerase (PGI1) mediates photosynthesis, metabolism, and development, probably due to its involvement in the synthesis of isoprenoid-derived signals in vascular tissues. Microbial volatile compounds (VCs) with molecular masses of less than 45 Da promote photosynthesis, growth, and starch over-accumulation in leaves through PGI1-independent mechanisms. Exposure to these compounds in leaves enhances the levels of GLUCOSE-6-PHOSPHATE/PHOSPHATE TRANSLOCATOR2 (GPT2) transcripts...
September 16, 2022: Plant Physiology
https://read.qxmd.com/read/35946757/ascorbate-peroxidase-post-cold-regulation-of-chloroplast-nadph-dehydrogenase-activity-controls-cold-memory
#3
JOURNAL ARTICLE
Victoria Seiml-Buchinger, Elena Reifschneider, Andras Bittner, Margarete Baier
Exposure of Arabidopsis (Arabidopsis thaliana) to 4 °C imprints a cold memory that modulates gene expression in response to a second (triggering) stress stimulus applied several days later. Comparison of plastid transcriptomes of cold-primed and control plants directly before they were exposed to the triggering stimulus showed downregulation of several subunits of chloroplast NADPH dehydrogenase (NDH) and regulatory subunits of ATP synthase. NDH is, like PGR5-PGRL1 (Proton gradient 5-PGR5-like1), a thylakoid-embedded, ferredoxin-dependent plastoquinone reductase that protects photosystem I and stabilizes ATP synthesis by cyclic electron transport...
August 10, 2022: Plant Physiology
https://read.qxmd.com/read/35705109/heat-shock-factor-hsfa2-fine-tunes-resetting-of-thermomemory-via-plastidic-metalloprotease-ftsh6
#4
JOURNAL ARTICLE
Mastoureh Sedaghatmehr, Benno Stüwe, Bernd Mueller-Roeber, Salma Balazadeh
Plants ´memorize´ stressful events and protect themselves from future, often more severe, stresses. To maximize growth after stress, plants ´reset´, or ´forget´, memories of stressful situations which requires an intricate balance between stress memory formation and the degree of forgetfulness. HEAT SHOCK PROTEIN 21 (HSP21) encodes a small HSP in plastids of Arabidopsis thaliana. Previous research found that HSP21 functions as a key component of thermomemory, which requires a sustained elevated level of HSP21 during the recovery from heat stress (HS)...
June 15, 2022: Journal of Experimental Botany
https://read.qxmd.com/read/34636184/transcriptional-memory-and-response-to-adverse-temperatures-in-plants
#5
JOURNAL ARTICLE
Wei Xie, Qianqian Tang, Fei Yan, Zeng Tao
Temperature is one of the major environmental signals controlling plant development, geographical distribution, and seasonal behavior. Plants perceive adverse temperatures, such as high, low, and freezing temperatures, as stressful signals that can cause physiological defects and even death. As sessile organisms, plants have evolved sophisticated mechanisms to adapt to recurring stressful environments through changing gene expression or transcriptional reprogramming. Transcriptional memory refers to the ability of primed plants to remember previously experienced stress and acquire enhanced tolerance to similar or different stresses...
October 15, 2021: Journal of Zhejiang University. Science. B
https://read.qxmd.com/read/34591082/dynamics-and-thermal-sensitivity-of-ribosomal-rna-maturation-paths-in-plants
#6
JOURNAL ARTICLE
Thiruvenkadam Shanmugam, Deniz Streit, Frank Schroll, Jelena Kovacevic, Enrico Schleiff
Ribosome biogenesis is a constitutive fundamental process for cellular function. Its rate of production depends on the rate of maturation of precursor ribosomal RNA (pre-rRNA). The rRNA maturation paths are marked by four dominant rate-limiting intermediates with cell-type variation of the processivity rate. We have identified that high temperature stress in plants, while halting the existing pre-rRNA maturation schemes, also transiently triggers an atypical pathway for 35S pre-rRNA processing. This pathway leads to production of an aberrant precursor rRNA, reminiscent of yeast 24S, encompassing 18S and 5...
September 30, 2021: Journal of Experimental Botany
https://read.qxmd.com/read/34016690/small-rnas-guide-histone-methylation-in-arabidopsis-embryos
#7
JOURNAL ARTICLE
Jean-Sébastien Parent, Jonathan Cahn, Rowan P Herridge, Daniel Grimanelli, Robert A Martienssen
Epigenetic reprogramming occurs during gametogenesis as well as during embryogenesis to reset the genome for early development. In flowering plants, many heterochromatic marks are maintained in sperm, but asymmetric DNA methylation is mostly lost. Asymmetric DNA methylation is dependent on small RNA but the re-establishment of silencing in embryo is not well understood. Here we demonstrate that small RNAs direct the histone H3 lysine 9 dimethylation during Arabidopsis thaliana embryonic development, together with asymmetric DNA methylation...
June 2021: Genes & Development
https://read.qxmd.com/read/32967551/selective-autophagy-regulates-heat-stress-memory-in-arabidopsis-by-nbr1-mediated-targeting-of-hsp90-and-rof1
#8
JOURNAL ARTICLE
Venkatesh P Thirumalaikumar, Michal Gorka, Karina Schulz, Celine Masclaux-Daubresse, Arun Sampathkumar, Aleksandra Skirycz, Richard D Vierstra, Salma Balazadeh
In nature, plants are constantly exposed to many transient, but recurring, stresses. Thus, to complete their life cycles, plants require a dynamic balance between capacities to recover following cessation of stress and maintenance of stress memory. Recently, we uncovered a new functional role for macroautophagy/autophagy in regulating recovery from heat stress (HS) and resetting cellular memory of HS in Arabidopsis thaliana . Here, we demonstrated that NBR1 (next to BRCA1 gene 1) plays a crucial role as a receptor for selective autophagy during recovery from HS...
September 24, 2020: Autophagy
https://read.qxmd.com/read/32538269/memory-of-5-min-heat-stress-in-arabidopsis-thaliana
#9
JOURNAL ARTICLE
Kohey Oyoshi, Kazuma Katano, Mai Yunose, Nobuhiro Suzuki
An ability of plants memorizing past heat exposure to modulate the expression of stress response transcripts during recovery is essential for efficient acquired thermotolerance. In this study, we demonstrated that expression of heat response transcripts spiked at 30 min or 1 h, but dramatically declined at 3 h during recoveries following exposure to 5-min heat stress in Arabidopsis. In contrast, expression of transcripts up-regulated by 45-min heat stress was sustained for 30 min or 1 h then declined during recovery...
June 14, 2020: Plant Signaling & Behavior
https://read.qxmd.com/read/32532801/functional-diversification-of-replication-protein-a-paralogs-and-telomere-length-maintenance-in-arabidopsis
#10
JOURNAL ARTICLE
Behailu B Aklilu, François Peurois, Carole Saintomé, Kevin M Culligan, Daniela Kobbe, Catherine Leasure, Michael Chung, Morgan Cattoor, Ryan Lynch, Lauren Sampson, John Fatora, Dorothy E Shippen
Replication protein A (RPA) is essential for many facets of DNA metabolism. The RPA gene family expanded in Arabidopsis thaliana with five phylogenetically distinct RPA1 subunits (RPA1A-E), two RPA2 (RPA2A and B), and two RPA3 (RPA3A and B). RPA1 paralogs exhibit partial redundancy and functional specialization in DNA replication (RPA1B and RPA1D), repair (RPA1C and RPA1E), and meiotic recombination (RPA1A and RPA1C). Here, we show that RPA subunits also differentially impact telomere length set point. Loss of RPA1 resets bulk telomeres at a shorter length, with a functional hierarchy for replication group over repair and meiosis group RPA1 subunits...
August 2020: Genetics
https://read.qxmd.com/read/31569782/the-recovery-from-sulfur-starvation-is-independent-from-the-mrna-degradation-initiation-enzyme-parn-in-arabidopsis
#11
JOURNAL ARTICLE
Laura Armbruster, Veli Vural Uslu, Markus Wirtz, Rüdiger Hell
When plants are exposed to sulfur limitation, they upregulate the sulfate assimilation pathway at the expense of growth-promoting measures. Upon cessation of the stress, however, protective measures are deactivated, and growth is restored. In accordance with these findings, transcripts of sulfur-deficiency marker genes are rapidly degraded when starved plants are resupplied with sulfur. Yet it remains unclear which enzymes are responsible for the degradation of transcripts during the recovery from starvation...
September 27, 2019: Plants (Basel, Switzerland)
https://read.qxmd.com/read/30962525/embryonic-resetting-of-the-parental-vernalized-state-by-two-b3-domain-transcription-factors-in-arabidopsis
#12
JOURNAL ARTICLE
Zeng Tao, Hongmiao Hu, Xiao Luo, Bei Jia, Jiamu Du, Yuehui He
Some overwintering plants acquire competence to flower, after experiencing prolonged cold in winter, through a process termed vernalization. In the crucifer plant Arabidopsis thaliana, prolonged cold induces chromatin-mediated silencing of the potent floral repressor FLOWERING LOCUS C (FLC) by Polycomb proteins. This vernalized state is epigenetically maintained or 'memorized' in warm rendering plants competent to flower in spring, but is reset in the next generation. Here, we show that in early embryogenesis, two homologous B3 domain transcription factors LEAFY COTYLEDON 2 (LEC2) and FUSCA3 (FUS3) compete against two repressive B3-containing epigenome readers and Polycomb partners known as VAL1 and VAL2 for the cis-regulatory cold memory element (CME) of FLC to disrupt Polycomb silencing...
April 2019: Nature Plants
https://read.qxmd.com/read/30577529/the-lnk-gene-family-at-the-crossroad-between-light-signaling-and-the-circadian-clock
#13
JOURNAL ARTICLE
María José de Leone, Carlos Esteban Hernando, Andrés Romanowski, Mariano García-Hourquet, Daniel Careno, Joaquín Casal, Matías Rugnone, Santiago Mora-García, Marcelo Javier Yanovsky
Light signaling pathways interact with the circadian clock to help organisms synchronize physiological and developmental processes to periodic environmental cycles. The plant photoreceptors responsible for clock resetting have been characterized, but signaling components that link the photoreceptors to the clock remain to be identified. Members of the family of NIGHT LIGHT⁻INDUCIBLE AND CLOCK-REGULATED ( LNK ) genes play key roles linking light regulation of gene expression to the control of daily and seasonal rhythms in Arabidopsis thaliana ...
December 20, 2018: Genes
https://read.qxmd.com/read/30136402/a-regulatory-role-of-autophagy-for-resetting-the-memory-of-heat-stress-in-plants
#14
JOURNAL ARTICLE
Mastoureh Sedaghatmehr, Venkatesh P Thirumalaikumar, Iman Kamranfar, Anne Marmagne, Celine Masclaux-Daubresse, Salma Balazadeh
As sessile life forms, plants are repeatedly confronted with adverse environmental conditions, which can impair development, growth, and reproduction. During evolution, plants have established mechanisms to orchestrate the delicate balance between growth and stress tolerance, to reset cellular biochemistry once stress vanishes, or to keep a molecular memory, which enables survival of a harsher stress that may arise later. Although there are several examples of memory in diverse plants species, the molecular machinery underlying the formation, duration, and resetting of stress memories is largely unknown so far...
August 22, 2018: Plant, Cell & Environment
https://read.qxmd.com/read/29944436/differential-effects-of-light-to-dark-transitions-on-phase-setting-in-circadian-expression-among-clock-controlled-genes-in-pharbitis-nil
#15
JOURNAL ARTICLE
R Hayama, T Mizoguchi, G Coupland
The circadian clock is synchronized by the day-night cycle to allow plants to anticipate daily environmental changes and to recognize annual changes in day length enabling seasonal flowering. This clock system has been extensively studied in Arabidopsis thaliana and was found to be reset by the dark to light transition at dawn. By contrast, studies on photoperiodic flowering of Pharbitis nil revealed the presence of a clock system reset by the transition from light to dark at dusk to measure the duration of the night...
2018: Plant Signaling & Behavior
https://read.qxmd.com/read/29072296/embryonic-epigenetic-reprogramming-by-a-pioneer-transcription-factor-in-plants
#16
JOURNAL ARTICLE
Zeng Tao, Lisha Shen, Xiaofeng Gu, Yizhong Wang, Hao Yu, Yuehui He
Epigenetic modifications, including chromatin modifications and DNA methylation, have a central role in the regulation of gene expression in plants and animals. The transmission of epigenetic marks is crucial for certain genes to retain cell lineage-specific expression patterns and maintain cell fate. However, the marks that have accumulated at regulatory loci during growth and development or in response to environmental stimuli need to be deleted in gametes or embryos, particularly in organisms such as plants that do not set aside a germ line, to ensure the proper development of offspring...
November 2, 2017: Nature
https://read.qxmd.com/read/28498984/inheritance-of-vernalization-memory-at-flowering-locus-c-during-plant-regeneration
#17
JOURNAL ARTICLE
Miyuki Nakamura, Lars Hennig
Specific gene states can be transmitted to subsequent cell generations through mitosis involving particular chromatin (epigenetic) states. During reproduction of plants and animals, however, most epigenetic states are reset to allow development to start anew. Flowering is one of the critical developmental steps by which plants acquire their reproductive capacity. This phase transition is controlled by environmental signals and autonomous regulation. The FLOWERING LOCUS C (FLC) gene is a flowering repressor that is epigenetically silenced after long-term exposure to cold, ensuring flowering in the spring season...
May 17, 2017: Journal of Experimental Botany
https://read.qxmd.com/read/27329974/pre-exposure-of-arabidopsis-to-the-abiotic-or-biotic-environmental-stimuli-chilling-or-insect-eggs-exhibits-different-transcriptomic-responses-to-herbivory
#18
JOURNAL ARTICLE
Vivien Firtzlaff, Jana Oberländer, Sven Geiselhardt, Monika Hilker, Reinhard Kunze
Plants can retain information about environmental stress and thus, prepare themselves for impending stress. In nature, it happens that environmental stimuli like 'cold' and 'insect egg deposition' precede insect herbivory. Both these stimuli are known to elicit transcriptomic changes in Arabidposis thaliana. It is unknown, however, whether they affect the plant's anti-herbivore defence and feeding-induced transcriptome when they end prior to herbivory. Here we investigated the transcriptomic response of Arabidopsis to feeding by Pieris brassicae larvae after prior exposure to cold or oviposition...
June 22, 2016: Scientific Reports
https://read.qxmd.com/read/25838417/phase-response-of-the-arabidopsis-thaliana-circadian-clock-to-light-pulses-of-different-wavelengths
#19
JOURNAL ARTICLE
Takayuki Ohara, Hirokazu Fukuda, Isao T Tokuda
Light is known as one of the most powerful environmental time cues for the circadian system. The quality of light is characterized by its intensity and wavelength. We examined how the phase response of Arabidopsis thaliana depends on the wavelength of the stimulus light and the type of light perturbation. Using transgenic A. thaliana expressing a luciferase gene, we monitored the rhythm of the bioluminescence signal. We stimulated the plants under constant red light using 3 light perturbation treatments: (1) increasing the red light intensity, (2) turning on a blue light while turning off the red light, and (3) turning on a blue light while keeping the red light on...
April 2015: Journal of Biological Rhythms
https://read.qxmd.com/read/25694001/reprogramming-of-plant-cells-induced-by-6b-oncoproteins-from-the-plant-pathogen-agrobacterium
#20
REVIEW
Masaki Ito, Yasunori Machida
Reprogramming of plant cells is an event characterized by dedifferentiation, reacquisition of totipotency, and enhanced cell proliferation, and is typically observed during formation of the callus, which is dependent on plant hormones. The callus-like cell mass, called a crown gall tumor, is induced at the sites of infection by Agrobacterium species through the expression of hormone-synthesizing genes encoded in the T-DNA region, which probably involves a similar reprogramming process. One of the T-DNA genes, 6b, can also by itself induce reprogramming of differentiated cells to generate tumors and is therefore recognized as an oncogene acting in plant cells...
May 2015: Journal of Plant Research
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