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Photomorphogenesis

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https://www.readbyqxmd.com/read/28076780/det1-and-hy5-control-pif4-mediated-thermosensory-elongation-growth-through-distinct-mechanisms
#1
Sreeramaiah N Gangappa, S Vinod Kumar
Plant growth and development are defined by environmental cues. The transcription factor PHYTOCHROME INTERACTING FACTOR 4 (PIF4) is the central signaling hub that integrates environmental cues, including light and temperature, to regulate growth and development. The thermosensory mechanisms controlling the PIF4-mediated temperature response, and its integration with other environmental responses, remain poorly understood. DE-ETIOLATED 1 (DET1) and CONSTITUTIVE PHOTOMORPHOGENESIS 1 (COP1), key regulators of light signaling, have been proposed to control thermosensory growth by transcriptional regulation of PIF4, through ELONGATED HYPOCOTYL 5 (HY5)...
January 10, 2017: Cell Reports
https://www.readbyqxmd.com/read/28073698/ectopic-expression-of-an-apple-cytochrome-p450-gene-mdcypm1-negatively-regulates-plant-photomorphogenesis-and-stress-response-in-arabidopsis
#2
Jian-Ping An, Rui Li, Feng-Jia Qu, Chun-Xiang You, Xiao-Fei Wang, Yu-Jin Hao
Cytochrome P450s play an important role in plant growth and are involved in multiple stresses response. However, little is known about the functions of cytochrome P450s in apple. Here, a Malus × domestica cytochrome P450 monooxygenase 1 gene, MdCYPM1, was identified and subsequently cloned from apple 'Gala' (Malus × domestica). To verify the functions of MdCYPM1, we generated transgenic Arabidopsis plants expressing the apple MdCYPM1 gene under the control of the Cauliflower mosaic virus 35S promoter...
January 29, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28011868/chemical-induced-inhibition-of-blue-light-mediated-seedling-development-caused-by-disruption-of-upstream-signal-transduction-involving-cryptochromes-in-arabidopsis-thaliana
#3
Wen-Dee Ong, Emiko Okubo-Kurihara, Yukio Kurihara, Setsuko Shimada, Yuko Makita, Mika Kawashima, Kaori Honda, Yasumitsu Kondoh, Nobumoto Watanabe, Hiroyuki Osada, Sean R Cutler, Kumar Sudesh, Minami Matsui
Plants have a remarkable ability to perceive and respond to various wavelengths of light and initiate regulation of different cascades of light signaling and molecular components. While the perception of red light and the mechanisms of its signaling involving phytochromes are largely known, knowledge of the mechanisms of blue light signaling is still limited. Chemical genetics involves the use of diverse small active or synthetic molecules to evaluate biological processes. By combining chemicals and analyzing the effects they have on plant morphology, we identified a chemical, 3-bromo-7-nitroindazole (3B7N), that promotes hypocotyl elongation of wild-type Arabidopsis only under continuous blue light...
December 22, 2016: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28010046/development-of-transgenic-crops-based-on-photo-biotechnology
#4
REVIEW
Markkandan Ganesan, Hyo-Yeon Lee, Jeong-Il Kim, Pill-Soon Song
The phenotypes associated with plant photomorphogenesis such as the suppressed shade avoidance response and de-etiolation offer the potential for significant enhancement of crop yields. Of many light signal transducers and transcription factors involved in the photomorphogenic responses of plants, this review focuses on the transgenic overexpression of the photoreceptor genes at the uppermost stream of the signaling events, particularly phytochromes, crytochromes and phototropins as the transgenes for the genetic engineering of crops with improved harvest yields...
December 23, 2016: Plant, Cell & Environment
https://www.readbyqxmd.com/read/27997837/photomorphogenesis-plants-feel-blue-in-the-shade
#5
Keara A Franklin
Plants integrate multiple environmental signals to detect and avoid shading from neighbouring vegetation. Two new studies highlight the importance of blue light in the regulation of stem elongation and bending during shade escape.
December 19, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/27956583/metabolic-signaling-regulates-alternative-splicing-during-photomorphogenesis
#6
EDITORIAL
Kathleen L Farquharson
No abstract text is available yet for this article.
November 2016: Plant Cell
https://www.readbyqxmd.com/read/27909441/apple-f-box-protein-mdmax2-regulates-plant-photomorphogenesis-and-stress-response
#7
Jian-Ping An, Rui Li, Feng-Jia Qu, Chun-Xiang You, Xiao-Fei Wang, Yu-Jin Hao
MAX2 (MORE AXILLARY GROWTH2) is involved in diverse physiological processes, including photomorphogenesis, the abiotic stress response, as well as karrikin and strigolactone signaling-mediated shoot branching. In this study, MdMAX2, an F-box protein that is a homolog of Arabidopsis MAX2, was identified and characterized. Overexpression of MdMAX2 in apple calli enhanced the accumulation of anthocyanin. Ectopic expression of MdMAX2 in Arabidopsis exhibited photomorphogenesis phenotypes, including increased anthocyanin content and decreased hypocotyl length...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27890635/hos1-facilitates-the-phytochrome-b-mediated-inhibition-of-pif4-function-during-hypocotyl-growth-in-arabidopsis
#8
Ju-Heon Kim, Hyo-Jun Lee, Jae-Hoon Jung, Sangmin Lee, Chung-Mo Park
Upon exposure to light, developing seedlings undergo photomorphogenesis, as illustrated by inhibition of hypocotyl elongation, cotyledon opening, and leaf greening. Hypocotyl growth is a well-established model for photomorphogenesis studies. During hypocotyl photomorphogenesis, light signals are sensed by multiple photoreceptors, among which the red/far-red light-sensing phytochromes have been extensively studied. However, it is not fully understood how the phytochromes modulate hypocotyl growth. Here, we demonstrated that HIGH EXPRESSION OF OSMOTICALLY RESPONSIVE GENES 1 (HOS1), which is known to either act as E3 ubiquitin ligase or affect chromatin organization, inhibits the transcriptional activation activity of PHYTOCHROME INTERACTING FACTOR 4 (PIF4) that promotes hypocotyl growth...
November 24, 2016: Molecular Plant
https://www.readbyqxmd.com/read/27876642/arabidopsis-nf-ycs-mediate-the-light-control-of-hypocotyl-elongation-via-modulating-histone-acetylation
#9
Yang Tang, Xuncheng Liu, Xu Liu, Yuge Li, Keqiang Wu, Xingliang Hou
Light is a crucial environmental signal that promotes photomorphogenesis, the developmental process containing a series of light-dependent alterations for plants to adapt various external challenges. Chromatin modification has been proposed to be involved in such light-mediated growth, but the underlying mechanism is still elusive. Here, we identify that the four Arabidopsis thaliana Nuclear Factor-YC homologues NF-YC1, NF-YC3, NF-YC4, and NF-YC9 (NF-YCs) function redundantly as the repressors of light control of hypocotyl elongation via histone de-acetylation...
November 19, 2016: Molecular Plant
https://www.readbyqxmd.com/read/27869306/roles-of-multifunctional-cop9-signalosome-complex-in-cell-fate-and-implications-for-drug-discovery
#10
REVIEW
Ping Li, Longxiang Xie, Yinzhong Gu, Jiang Li, Jianping Xie
The eight subunits containing COP9 signalosome (CSN) complex, is highly conserved among eukaryotes. CSN, identified as a negative regulator of photomorphogenesis, has also been demonstrated to be important in proteolysis, cellular signal transduction and cell cycle regulation in various eukaryotic organisms. This review mainly summarizes the roles of CSN in cell cycle regulation, signal transduction and apoptosis, and its potential as diagnostic biomarkers, drug targets for cancer and infectious diseases. This article is protected by copyright...
November 21, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27861972/cryptochromes-orchestrate-transcription-regulation-of-diverse-blue-light-responses-in-plants
#11
Zhaohe Yang, Bobin Liu, Jun Su, Jiakai Liao, Chentao Lin, Yoshito Oka
Blue light affects many aspects of plant growth and development throughout the plant lifecycle. Plant cryptochromes (CRYs) are UV-A/blue light photoreceptors that play pivotal roles in regulating blue light-mediated physiological responses via the regulated expression of more than one thousand genes. Photoactivated CRYs regulate transcription via two distinct mechanisms: indirect promotion of the activity of transcription factors by inactivation of the COP1/SPA E3 ligase complex or direct activation or inactivation of at least two sets of basic helix-loop-helix transcription factor families by physical interaction...
November 12, 2016: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/27858514/involvement-of-sth7-in-light-adapted-development-in-arabidopsis-thaliana-promoted-by-both-strigolactone-and-karrikin
#12
Jutiporn Thussagunpanit, Yuko Nagai, Miyu Nagae, Kiyoshi Mashiguchi, Nobutaka Mitsuda, Masaru Ohme-Takagi, Takeshi Nakano, Hidemitsu Nakamura, Tadao Asami
Strigolactones (SLs) and karrikins (KARs) regulate photomorphogenesis. GR24, a synthetic SL and KAR1, a KAR, inhibit the hypocotyl elongation of Arabidopsis thaliana in a weak light. GR24 and KAR1 up-regulate the expression of STH7, encoding a transcription factor belonging to the double B-box zinc finger subfamily. In this study, we used STH7-overexpressing (STH7ox) lines and functionally defective STH7 (STH7-SRDX) mutants to investigate roles of SLs and KARs in photomorphogenesis of Arabidopsis. Hypocotyl elongation of STH7-SRDX mutants was less sensitive to both GR24 and KAR1 treatment than that of wild-type Arabidopsis under weak light conditions...
November 18, 2016: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/27813089/light-behind-the-curtain-photoregulation-of-nuclear-architecture-and-chromatin-dynamics-in-plants
#13
Giorgio Perrella, Eirini Kaiserli
Light is a powerful stimulus regulating many aspects of plant development and phenotypic plasticity. Plants sense light through the action of specialized photoreceptor protein families that absorb different wavelengths and intensities of light. Recent discoveries in the area of photobiology have uncovered photoreversible changes in nuclear organization correlated with transcriptional regulation patterns that lead to de-etiolation and photoacclimation. Novel signalling components bridging photoreceptor activation with chromatin remodelling and regulation of gene expression have been discovered...
December 2016: New Phytologist
https://www.readbyqxmd.com/read/27803310/alternative-splicing-substantially-diversifies-the-transcriptome-during-early-photomorphogenesis-and-correlates-with-the-energy-availability-in-arabidopsis
#14
Lisa Hartmann, Philipp Drewe-Boß, Theresa Wießner, Gabriele Wagner, Sascha Geue, Hsin-Chieh Lee, Dominik M Obermüller, André Kahles, Jonas Behr, Fabian H Sinz, Gunnar Rätsch, Andreas Wachter
Plants use light as source of energy and information to detect diurnal rhythms and seasonal changes. Sensing changing light conditions is critical to adjust plant metabolism and to initiate developmental transitions. Here, we analyzed transcriptome-wide alterations in gene expression and alternative splicing (AS) of etiolated seedlings undergoing photomorphogenesis upon exposure to blue, red, or white light. Our analysis revealed massive transcriptome reprogramming as reflected by differential expression of ∼20% of all genes and changes in several hundred AS events...
November 2016: Plant Cell
https://www.readbyqxmd.com/read/27803284/stem-piped-light-activates-phytochrome-b-to-trigger-light-responses-in-arabidopsis-thaliana-roots
#15
Hyo-Jun Lee, Jun-Ho Ha, Sang-Gyu Kim, Han-Kyu Choi, Zee Hwan Kim, Yun-Jeong Han, Jeong-Il Kim, Youngjoo Oh, Variluska Fragoso, Kwangsoo Shin, Taeghwan Hyeon, Hong-Gu Choi, Kyung-Hwan Oh, Ian T Baldwin, Chung-Mo Park
The roles of photoreceptors and their associated signaling mechanisms have been extensively studied in plant photomorphogenesis with a major focus on the photoresponses of the shoot system. Accumulating evidence indicates that light also influences root growth and development through the light-induced release of signaling molecules that travel from the shoot to the root. We explored whether aboveground light directly influences the root system of Arabidopsis thaliana Light was efficiently conducted through the stems to the roots, where photoactivated phytochrome B (phyB) triggered expression of ELONGATED HYPOCOTYL 5 (HY5) and accumulation of HY5 protein, a transcription factor that promotes root growth in response to light...
November 1, 2016: Science Signaling
https://www.readbyqxmd.com/read/27748879/quercetin-induced-apoptosis-of-ht-29%C3%A2-colon-cancer-cells-via-inhibition-of-the-akt-csn6-myc-signaling-axis
#16
Lin Yang, Yanqing Liu, Mei Wang, Yayun Qian, Xiaoyun Dong, Hao Gu, Haibo Wang, Shiyu Guo, Tadashi Hisamitsu
Constitutive photomorphogenesis 9 signalosome (CSN) consists of a total of eight subunits (CSN1-CSN8) in mammalian cells. CSN6 may promote carcinogenesis by positively regulating v‑myc avian myelocytomatosis viral oncogene homolog (Myc) and MDM2 proto‑oncogene stability, and is regarded as a potential target for cancer therapy. Quercetin has a substantial anticancer effect on various human cancer cells. The present study investigated the effects of quercetin on HT-29 human colorectal cancer cell viability, apoptosis and cell cycle arrest using an MTT assay, flow cytometry, transmission electron microscopy and western blotting...
November 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27717456/repressor-of-ultraviolet-b-photomorphogenesis-function-allows-efficient-phototropin-mediated-ultraviolet-b-phototropism-in-etiolated-seedlings
#17
Lucas Vanhaelewyn, Paolo Schumacher, Dirk Poelman, Christian Fankhauser, Dominique Van Der Straeten, Filip Vandenbussche
Ultraviolet B (UV-B) light is a part of the solar radiation which has significant effects on plant morphology, even at low doses. In Arabidopsis, many of these morphological changes have been attributed to a specific UV-B receptor, UV resistance locus 8 (UVR8). Recent findings showed that next to phototropin regulated phototropism, UVR8 mediated signaling is able of inducing directional bending towards UV-B light in etiolated seedlings of Arabidopsis, in a phototropin independent manner. In this study, kinetic analysis of phototropic bending was used to evaluate the relative contribution of each of these pathways in UV-B mediated phototropism...
November 2016: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/27685091/nuclear-factor-y-subunit-c-nf-yc-transcription-factors-are-positive-regulators-of-photomorphogenesis-in-arabidopsis-thaliana
#18
Zachary A Myers, Roderick W Kumimoto, Chamindika L Siriwardana, Krystal K Gayler, Jan R Risinger, Daniela Pezzetta, Ben F Holt Iii
Recent reports suggest that NF-Y transcription factors are positive regulators of skotomorphogenesis in Arabidopsis thaliana. Three NF-YC genes (NF-YC3, NF-YC4, and NF-YC9) are known to have overlapping functions in photoperiod dependent flowering and previous studies demonstrated that they interact with basic leucine zipper (bZIP) transcription factors. This included ELONGATED HYPOCOTYL 5 (HY5), which has well-demonstrated roles in photomorphogenesis. Similar to hy5 mutants, we report that nf-yc3 nf-yc4 nf-yc9 triple mutants failed to inhibit hypocotyl elongation in all tested light wavelengths...
September 2016: PLoS Genetics
https://www.readbyqxmd.com/read/27546621/csn6-controls-the-proliferation-and-metastasis-of-glioblastoma-by-chip-mediated-degradation-of-egfr
#19
J Hou, Q Deng, J Zhou, J Zou, Y Zhang, P Tan, W Zhang, H Cui
CSN6, a critical subunit of the constitutive photomorphogenesis 9 (COP9) signalosome (CSN), has received attention as a regulator of the degradation of cancer-related proteins such as p53, c-myc and c-Jun, through the ubiquitin-proteasome system, suggesting its importance in cancerogenesis. However, the biological functions and molecular mechanisms of CSN6 in glioblastoma (GBM) remain poorly understood. Here, we report that GBM tumors overexpressed CSN6 compared with normal brain tissues and that CSN6 promoted GBM cell proliferation, migration, invasion and tumorigenesis...
August 22, 2016: Oncogene
https://www.readbyqxmd.com/read/27524234/isolation-of-three-b-box-zinc-finger-proteins-that-interact-with-stf1-and-cop1-defines-a-hy5-cop1-interaction-network-involved-in-light-control-of-development-in-soybean
#20
Su Young Shin, Seong Hee Kim, Hye Jin Kim, Su Jeong Jeon, Soon Ae Sim, Gyeong Ryul Ryu, Cheol Min Yoo, Yong Hwa Cheong, Jong Chan Hong
LONG HYPOCOTYL5 (HY5) and STF1 (Soybean TGACG-motif binding Factor 1) are two related bZIP transcription factors that play a positive role in photomorphogenesis and hormonal signaling. In this study, we compared full length STF1 and truncated STF1 overexpression lines and found that the C-terminal 133 amino acids (194-306) possess all the HY5-like function in Arabidopsis. The STF1-DC1 mutant (1-306), with a 20 amino acid deletion at the carboxy terminus, failed to complement the hy5 mutant phenotype, which suggests an intact C-terminus is required for STF1 function...
September 23, 2016: Biochemical and Biophysical Research Communications
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