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https://www.readbyqxmd.com/read/29944436/differential-effects-of-light-to-dark-transitions-on-phase-setting-in-circadian-expression-among-clock-controlled-genes-in-pharbitis-nil
#1
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...
June 26, 2018: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/29072296/embryonic-epigenetic-reprogramming-by-a-pioneer-transcription-factor-in-plants
#2
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://www.readbyqxmd.com/read/28498984/inheritance-of-vernalization-memory-at-flowering-locus-c-during-plant-regeneration
#3
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://www.readbyqxmd.com/read/27329974/pre-exposure-of-arabidopsis-to-the-abiotic-or-biotic-environmental-stimuli-chilling-or-insect-eggs-exhibits-different-transcriptomic-responses-to-herbivory
#4
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://www.readbyqxmd.com/read/25838417/phase-response-of-the-arabidopsis-thaliana-circadian-clock-to-light-pulses-of-different-wavelengths
#5
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://www.readbyqxmd.com/read/25694001/reprogramming-of-plant-cells-induced-by-6b-oncoproteins-from-the-plant-pathogen-agrobacterium
#6
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
https://www.readbyqxmd.com/read/25219852/epigenetic-reprogramming-that-prevents-transgenerational-inheritance-of-the-vernalized-state
#7
Pedro Crevillén, Hongchun Yang, Xia Cui, Christiaan Greeff, Martin Trick, Qi Qiu, Xiaofeng Cao, Caroline Dean
The reprogramming of epigenetic states in gametes and embryos is essential for correct development in plants and mammals. In plants, the germ line arises from somatic tissues of the flower, necessitating the erasure of chromatin modifications that have accumulated at specific loci during development or in response to external stimuli. If this process occurs inefficiently, it can lead to epigenetic states being inherited from one generation to the next. However, in most cases, accumulated epigenetic modifications are efficiently erased before the next generation...
November 27, 2014: Nature
https://www.readbyqxmd.com/read/23869666/time-for-coffee-is-an-essential-component-in-the-maintenance-of-metabolic-homeostasis-in-arabidopsis-thaliana
#8
Alfredo Sanchez-Villarreal, Jieun Shin, Nora Bujdoso, Toshihiro Obata, Ulla Neumann, Shen-Xiu Du, Zhaojun Ding, Amanda M Davis, Takayuki Shindo, Elmon Schmelzer, Ronan Sulpice, Adriano Nunes-Nesi, Mark Stitt, Alisdair R Fernie, Seth J Davis
Plants often respond to environmental changes by reprogramming metabolic and stress-associated pathways. Homeostatic integration of signaling is a central requirement for ensuring metabolic stability in living organisms. Under diurnal conditions, properly timed rhythmic metabolism provides fitness benefits to plants. TIME FOR COFFEE (TIC) is a circadian regulator known to be involved in clock resetting at dawn. Here we explored the mechanism of influence of TIC in plant growth and development, as initiated by a microarray analysis...
October 2013: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/23818596/lnk-genes-integrate-light-and-clock-signaling-networks-at-the-core-of-the-arabidopsis-oscillator
#9
Matias L Rugnone, Ana Faigón Soverna, Sabrina E Sanchez, Ruben Gustavo Schlaen, Carlos Esteban Hernando, Danelle K Seymour, Estefanía Mancini, Ariel Chernomoretz, Detlef Weigel, Paloma Más, Marcelo J Yanovsky
Light signaling pathways and the circadian clock interact to help organisms synchronize physiological and developmental processes with 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. Here we describe a family of night light-inducible and clock-regulated genes (LNK) that play a key role linking light regulation of gene expression to the control of daily and seasonal rhythms in Arabidopsis thaliana...
July 16, 2013: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/23446868/low-oxygen-response-mechanisms-in-green-organisms
#10
Valeria Banti, Beatrice Giuntoli, Silvia Gonzali, Elena Loreti, Leonardo Magneschi, Giacomo Novi, Eleonora Paparelli, Sandro Parlanti, Chiara Pucciariello, Antonietta Santaniello, Pierdomenico Perata
Low oxygen stress often occurs during the life of green organisms, mostly due to the environmental conditions affecting oxygen availability. Both plants and algae respond to low oxygen by resetting their metabolism. The shift from mitochondrial respiration to fermentation is the hallmark of anaerobic metabolism in most organisms. This involves a modified carbohydrate metabolism coupled with glycolysis and fermentation. For a coordinated response to low oxygen, plants exploit various molecular mechanisms to sense when oxygen is either absent or in limited amounts...
2013: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/22942380/skip-is-a-component-of-the-spliceosome-linking-alternative-splicing-and-the-circadian-clock-in-arabidopsis
#11
Xiaoxue Wang, Fangming Wu, Qiguang Xie, Huamei Wang, Ying Wang, Yanling Yue, Ondrej Gahura, Shuangshuang Ma, Lei Liu, Ying Cao, Yuling Jiao, Frantisek Puta, C Robertson McClung, Xiaodong Xu, Ligeng Ma
Circadian clocks generate endogenous rhythms in most organisms from cyanobacteria to humans and facilitate entrainment to environmental diurnal cycles, thus conferring a fitness advantage. Both transcriptional and posttranslational mechanisms are prominent in the basic network architecture of circadian systems. Posttranscriptional regulation, including mRNA processing, is emerging as a critical step for clock function. However, little is known about the molecular mechanisms linking RNA metabolism to the circadian clock network...
August 2012: Plant Cell
https://www.readbyqxmd.com/read/22761582/g-protein-activation-without-a-gef-in-the-plant-kingdom
#12
Daisuke Urano, Janice C Jones, Hao Wang, Melissa Matthews, William Bradford, Jeffrey L Bennetzen, Alan M Jones
Animal heterotrimeric G proteins are activated by guanine nucleotide exchange factors (GEF), typically seven transmembrane receptors that trigger GDP release and subsequent GTP binding. In contrast, the Arabidopsis thaliana G protein (AtGPA1) rapidly activates itself without a GEF and is instead regulated by a seven transmembrane Regulator of G protein Signaling (7TM-RGS) protein that promotes GTP hydrolysis to reset the inactive (GDP-bound) state. It is not known if this unusual activation is a major and constraining part of the evolutionary history of G signaling in eukaryotes...
June 2012: PLoS Genetics
https://www.readbyqxmd.com/read/22689891/hypocotyl-directional-growth-in-arabidopsis-a-complex-trait
#13
Aditi Gupta, Manjul Singh, Alan M Jones, Ashverya Laxmi
The growth direction of the Arabidopsis (Arabidopsis thaliana) etiolated-seedling hypocotyl is a complex trait that is controlled by extrinsic signals such as gravity and touch as well as intrinsic signals such as hormones (brassinosteroid [BR], auxin, cytokinin, ethylene) and nutrient status (glucose [Glc], sucrose). We used a genetic approach to identify the signaling elements and their relationship underlying hypocotyl growth direction. BR randomizes etiolated-seedling growth by inhibiting negative gravitropism of the hypocotyls via modulating auxin homeostasis for which we designate as reset, not to be confused with the gravity set point angle...
August 2012: Plant Physiology
https://www.readbyqxmd.com/read/22284718/light-at-night-resynchronizes-the-evening-phased-rhythms-of-toc1-and-elf4-in-phaseolus-vulgaris
#14
Angeliki Galeou, Anastasia Prombona
Circadian clocks regulate the adaptation of the organisms' physiology to the environmental light-dark cycles. Photic resetting of the clock differs among plant species. In Arabidopsis thaliana, morning-phased genes are not responsive to light signals at night, while in Phaseolus vulgaris, morning-phased genes are responsive to light at trough phases that are reached during the night. In order to explore this further, in this work we investigated the light-responsiveness at night of two P. vulgaris evening phased genes, the orthologs of TOC1 and ELF4...
March 2012: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/21908721/a-reduced-function-allele-reveals-that-early-flowering3-repressive-action-on-the-circadian-clock-is-modulated-by-phytochrome-signals-in-arabidopsis
#15
Elsebeth Kolmos, Eva Herrero, Nora Bujdoso, Andrew J Millar, Réka Tóth, Peter Gyula, Ferenc Nagy, Seth J Davis
Arabidopsis thaliana EARLY FLOWERING3 (ELF3) is essential for the generation of circadian rhythms. ELF3 has been proposed to restrict light signals to the oscillator through phytochrome photoreceptors, but that has not been explicitly shown. Furthermore, the genetic action of ELF3 within the clock had remained elusive. Here, we report a functional characterization of ELF3 through the analysis of the elf3-12 allele, which encodes an amino acid replacement in a conserved domain. Circadian oscillations persisted, and unlike elf3 null alleles, elf3-12 resulted in a short circadian period only under ambient light...
September 2011: Plant Cell
https://www.readbyqxmd.com/read/21278124/regulation-and-flexibility-of-genomic-imprinting-during-seed-development
#16
REVIEW
Michael T Raissig, Célia Baroux, Ueli Grossniklaus
Genomic imprinting results in monoallelic gene expression in a parent-of-origin-dependent manner. It is achieved by the differential epigenetic marking of parental alleles. Over the past decade, studies in the model systems Arabidopsis thaliana and maize (Zea mays) have shown a strong correlation between silent or active states with epigenetic marks, such as DNA methylation and histone modifications, but the nature of the primary imprint has not been clearly established for all imprinted genes. Phenotypes and expression patterns of imprinted genes have fueled the perception that genomic imprinting is specific to the endosperm, a seed tissue that does not contribute to the next generation...
January 2011: Plant Cell
https://www.readbyqxmd.com/read/20406912/robust-circadian-rhythms-of-gene-expression-in-brassica-rapa-tissue-culture
#17
Xiaodong Xu, Qiguang Xie, C Robertson McClung
Circadian clocks provide temporal coordination by synchronizing internal biological processes with daily environmental cycles. To date, study of the plant circadian clock has emphasized Arabidopsis (Arabidopsis thaliana) as a model, but it is important to determine the extent to which this model applies in other species. Accordingly, we have investigated circadian clock function in Brassica rapa. In Arabidopsis, analysis of gene expression in transgenic plants in which luciferase activity is expressed from clock-regulated promoters has proven a useful tool, although technical challenges associated with the regeneration of transgenic plants has hindered the implementation of this powerful tool in B...
June 2010: Plant Physiology
https://www.readbyqxmd.com/read/19291007/characterization-of-a-mads-flowering-locus-c-like-mfl-sequence-in-cichorium-intybus-a-comparative-study-of-cimfl-and-atflc-reveals-homologies-and-divergences-in-gene-function
#18
COMPARATIVE STUDY
A Locascio, M Lucchin, S Varotto
In Arabidopsis thaliana, the ability to flower is mainly related to a floral repressor, FLOWERING LOCUS C (FLC), which is regulated through the vernalization pathway. The genes controlling the vernalization pathway seem to be only partially conserved in dicots other than the Brassicaceae. Cichorium intybus (chicory) is a biennial species belonging to the Asteraceae family, and it shows an obligate vernalization requirement for flowering. Cichorium intybus MADS (MCM1, Agamous, Deficiens, SRF) FLC-like (CiMFL) sequences were isolated in C...
2009: New Phytologist
https://www.readbyqxmd.com/read/19121105/resetting-and-regulation-of-flowering-locus-c-expression-during-arabidopsis-reproductive-development
#19
Jean Choi, Youbong Hyun, Min-Jeong Kang, Hye In Yun, Jae-Young Yun, Clare Lister, Caroline Dean, Richard M Amasino, Bosl Noh, Yoo-Sun Noh, Yeonhee Choi
The epigenetic regulation of the floral repressor Flowering Locus C (FLC) is one of the critical factors that determine flowering time in Arabidopsis thaliana. Although many FLC regulators, and their effects on FLC chromatin, have been extensively studied, the epigenetic resetting of FLC has not yet been thoroughly characterized. Here, we investigate the FLC expression during gametogenesis and embryogenesis using FLC::GUS transgenic plants and RNA analysis. Regardless of the epigenetic state in adult plants, FLC expression disappeared in gametophytes...
March 2009: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/17383745/vernalization-a-model-for-investigating-epigenetics-and-eukaryotic-gene-regulation-in-plants
#20
REVIEW
Robert J Schmitz, Richard M Amasino
The transition from vegetative to reproductive development is a highly regulated process that, in many plant species, is sensitive to environmental cues that provide seasonal information to initiate flowering during optimal times of the year. One environmental cue is the cold of winter. Winter annuals and biennials typically require prolonged exposure to the cold of winter to flower rapidly in the spring. This process by which flowering is promoted by cold exposure is known as vernalization. The winter-annual habit of Arabidopsis thaliana is established by the ability of FRIGIDA to promote high levels of expression of the potent floral repressor FLOWERING LOCUS C (FLC)...
May 2007: Biochimica et Biophysica Acta
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