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Photomorphogenesis

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https://www.readbyqxmd.com/read/29143279/arabidopsis-noncoding-rna-modulates-seedling-greening-during-deetiolation
#1
Yuqiu Wang, Jian Li, Xing-Wang Deng, Danmeng Zhu
Seedling greening is essential for the survival of plants emerging from the soil. The abundance of chlorophyll precursors, including protochlorophyllide (Pchlide), is precisely controlled during the dark-to-light transition, as over-accumulation of Pchlide can lead to cellular photooxidative damage. Previous studies have identified and characterized multiple regulators controlling this important process. HID1 (hidden treasure 1) is the first noncoding RNA (ncRNA) found in photomorphogenesis. Under continuous red light, HID1 has been shown to inhibit hypocotyl elongation by repressing the transcription of PIF3 (phytochrome interacting factor 3)...
October 13, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/29103938/etiolated-seedling-development-requires-repression-of-photomorphogenesis-by-a-small-cell-wall-derived-dark-signal
#2
Scott A Sinclair, Camille Larue, Laura Bonk, Asif Khan, Hiram Castillo-Michel, Ricardo J Stein, Daniel Grolimund, Dominik Begerow, Ulla Neumann, Michael J Haydon, Ute Krämer
Etiolated growth in darkness or the irreversible transition to photomorphogenesis in the light engages alternative developmental programs operating across all organs of a plant seedling. Dark-grown Arabidopsis de-etiolated by zinc (dez) mutants exhibit morphological, cellular, metabolic, and transcriptional characteristics of light-grown seedlings. We identify the causal mutation in TRICHOME BIREFRINGENCE encoding a putative acyl transferase. Pectin acetylation is decreased in dez, as previously found in the reduced wall acetylation2-3 mutant, shown here to phenocopy dez...
November 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/29098377/overexpression-of-sweet-sorghum-cryptochrome-1a-confers-hypersensitivity-to-blue-light-abscisic-acid-and-salinity-in-arabidopsis
#3
Tingting Zhou, Lingyang Meng, Yue Ma, Qing Liu, Yunyun Zhang, Zhenming Yang, Deguang Yang, Mingdi Bian
This work provides the bioinformatics, expression pattern and functional analyses of cryptochrome 1a from sweet sorghum (SbCRY1a), together with an exploration of the signaling mechanism mediated by SbCRY1a. Sweet sorghum [Sorghum bicolor (L.) Moench] is considered to be an ideal candidate for biofuel production due to its high efficiency of photosynthesis and the ability to maintain yield under harsh environmental conditions. Blue light receptor cryptochromes regulate multiple aspects of plant growth and development...
November 2, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/29066723/blue-light-induced-biosynthesis-of-ros-contributes-to-the-signaling-mechanism-of-arabidopsis-cryptochrome
#4
Mohamed El-Esawi, Louis-David Arthaut, Nathalie Jourdan, Alain d'Harlingue, Justin Link, Carlos F Martino, Margaret Ahmad
Cryptochromes are evolutionarily conserved blue light receptors with many roles throughout plant growth and development. They undergo conformational changes in response to light enabling interaction with multiple downstream signaling partners. Recently, it has been shown that cryptochromes also synthesize reactive oxygen species (ROS) in response to light, suggesting the possibility of an alternate signaling mechanism. Here we show by fluorescence imaging and microscopy that H202 and ROS accumulate in the plant nucleus after cryptochrome activation...
October 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29063961/genome-wide-identification-and-expression-analysis-of-the-b-box-gene-family-in-the-apple-malus-domestica-borkh-genome
#5
Xin Liu, Rong Li, Yaqing Dai, Xuesen Chen, Xiaoyun Wang
The B-box proteins (BBXs) are a family of zinc finger proteins containing one/two B-box domain(s). Compared with intensive studies of animal BBXs, investigations of the plant BBX family are limited, though some specific plant BBXs have been demonstrated to act as transcription factors in the regulation of flowering and photomorphogenesis. In this study, using a global search of the apple (Malus domestica Borkh.) genome, a total of 64 members of BBX (MdBBX) were identified. All the MdBBXs were divided into five groups based on the phylogenetic relationship, numbers of B-boxes contained and whether there was with an additional CCT domain...
October 24, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/28992300/cop1-regulates-plant-growth-and-development-in-response-to-light-at-the-post-translational-level
#6
Joo Yong Kim, Jong Tae Song, Hak Soo Seo
Photoreceptors perceive different wavelengths of light and transduce light signals downstream via a range of proteins. COP1, an E3 ubiquitin ligase, regulates light signaling by mediating the ubiquitination and subsequent proteasomal degradation of photoreceptors such as phytochromes and cryptochromes, as well as various development-related proteins including other light-responsive proteins. COP1 is itself regulated by direct interactions with several signaling molecules that modulate its activity. The control of photomorphogenesis by COP1 is also regulated by its localization to the cytoplasm in response to light...
October 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28988633/stabilizing-the-transcription-factors-by-e3-ligase-cop1
#7
Ying Pan, Hui Shi
Photomorphogenesis is oppositely regulated by two groups of transcription factors. CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) degrades the positive factors but stabilizes the negative ones to predominantly repress photomorphogenesis. It is known that COP1 degrades substrates as an E3 ligase. Two recent studies unraveled the long-sought mechanisms of how COP1 stabilizes the negative transcription factors.
October 4, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28970845/comprehensive-analysis-of-dwarf14-like2-dlk2-reveals-its-functional-divergence-from-strigolactone-related-paralogs
#8
Attila Végh, Norbert Incze, Attila Fábián, Heqiang Huo, Kent J Bradford, Ervin Balázs, Vilmos Soós
Strigolactones (SLs) and related butenolides, originally identified as active seed germination stimulants of parasitic weeds, play important roles in many aspects of plant development. Two members of the D14 α/β hydrolase protein family, DWARF14 (D14) and KARRIKIN INSENSITIVE2 (KAI2) are essential for SL/butenolide signaling. The third member of the family in Arabidopsis, DWARF 14-LIKE2 (DLK2) is structurally very similar to D14 and KAI2, but its function is unknown. We demonstrated that DLK2 does not bind nor hydrolyze natural (+)5-deoxystrigol [(+)5DS], and weakly hydrolyzes non-natural strigolactone (-)5DS...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28932234/stunted-growth-caused-by-blast-disease-in-rice-seedlings-is-associated-with-changes-in-phytohormone-signaling-pathways
#9
Chang-Jie Jiang, Xiao-Long Liu, Xin-Qiong Liu, Hui Zhang, Ying-Jie Yu, Zheng-Wei Liang
In response to pathogen attack, plants prioritize defense reactions generally at the expense of plant growth. In this work, we report that changes in phytohormone signaling pathways are associated with the stunted plant growth caused by blast disease in rice seedlings. Infection of rice seedlings with blast fungus Magnaporthe oryzae (race 007.0) at the four-leaf stage (three true leaves) resulted in considerable inhibition of the growth of the upper uninfected distal leaves; the length of leaf blade and leaf sheath of the sixth and seventh leaf was reduced by 27 and 82%, and 88 and 72%, respectively, compared to that in the uninoculated plant control...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28922622/light-signaling-differentially-regulates-the-expression-of-group-iv-of-the-b-box-zinc-finger-family
#10
Xinyu Zhang, Rongcheng Lin
Light is an important external signal that affects plant growth and development, such as photomorphogenesis. Transcriptional regulation defines a central regulatory mechanism in photomorphogenesis. The B-box zinc finger family consists of 32 proteins in Arabidopsis thaliana. Previous studies show that group IV of the B-box family (BBX18 to BBX25) plays either positive or negative roles in regulating photomorphogenesis. We investigated the expression patterns of BBX18 to BBX25 and the results demonstrate that the transcriptional levels of these genes are differentially regulated by the light signaling pathway...
September 2, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28912351/reply-to-jin-and-zhu-pinoid-mediated-cop1-phosphorylation-matters-in-photomorphogenesis-in-arabidopsis
#11
Dongqing Xu, Xing Wang Deng
No abstract text is available yet for this article.
September 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28891468/epidermal-growth-factor-receptor-neddylation-is-regulated-by-a-desmosomal-cop9-constitutive-photomorphogenesis-9-signalosome-complex
#12
Nicole Ann Najor, Gillian Nicole Fitz, Jennifer Leigh Koetsier, Lisa Marie Godsel, Lauren Veronica Albrecht, Robert Harmon, Kathleen Janee Green
Cell junctions are scaffolds that integrate mechanical and chemical signaling. We previously showed that a desmosomal cadherin promotes keratinocyte differentiation in an adhesion-independent manner by dampening Epidermal Growth Factor Receptor (EGFR) activity. Here we identify a potential mechanism by which desmosomes assist the de-neddylating COP9 signalosome (CSN) in attenuating EGFR through an association between the Cops3 subunit of the CSN and desmosomal components, Desmoglein1 (Dsg1) and Desmoplakin (Dp), to promote epidermal differentiation...
September 11, 2017: ELife
https://www.readbyqxmd.com/read/28805486/cop1-integrates-light-signals-to-rop2-for-cell-cycle-activation
#13
Wenguo Cai, Xiaojuan Li, Yanlin Liu, Yaowei Wang, Yue Zhou, Tongda Xu, Yan Xiong
The exquisite regulation of cell division at the shoot apex according to the external environmental cues enables plants to adapt the ever-changing environment. We have recently shown that light direct signaling and carbohydrate (sugar) energy signaling are both essential for the activation of cell division at the shoot apex. Light is converted to auxin signal to activate small GTPase 2 (ROP2). Subsequently, the activated ROP2 directly interacts with Target of Rapamycin (TOR) protein kinase, a pivotal regulator of cell division, to promote its kinase activity...
September 2, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28771755/pickle-chromatin-remodeling-factor-controls-thermosensory-hypocotyl-growth-of-arabidopsis
#14
Ping Zha, Yanjun Jing, Gang Xu, Rongcheng Lin
Temperature is a major signal that governs plant distribution and shapes plant growth. High ambient temperature promotes plant thermomorphogenesis without significant induction of heat-stress responses. Although much progress of warm temperature-mediated plant growth has been made during recent years, the thermomorphogenic signalling pathway is not well understood. We previously revealed that PICKLE (PKL), an ATP-dependent chromatin remodelling factor, negatively controls photomorphogenesis in Arabidopsis thaliana...
August 2, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28760995/spf45-related-splicing-factor-for-phytochrome-signaling-promotes-photomorphogenesis-by-regulating-pre-mrna-splicing-in-arabidopsis
#15
Ruijiao Xin, Ling Zhu, Patrice A Salomé, Estefania Mancini, Carine M Marshall, Frank G Harmon, Marcelo J Yanovsky, Detlef Weigel, Enamul Huq
Light signals regulate plant growth and development by controlling a plethora of gene expression changes. Posttranscriptional regulation, especially pre-mRNA processing, is a key modulator of gene expression; however, the molecular mechanisms linking pre-mRNA processing and light signaling are not well understood. Here we report a protein related to the human splicing factor 45 (SPF45) named splicing factor for phytochrome signaling (SFPS), which directly interacts with the photoreceptor phytochrome B (phyB)...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28738828/unraveling-multifaceted-contributions-of-small-regulatory-rnas-to-photomorphogenic-development-in-arabidopsis
#16
Meng-Chun Lin, Huang-Lung Tsai, Sim-Lin Lim, Shih-Tong Jeng, Shu-Hsing Wu
BACKGROUND: Post-transcriptional control of gene expression mediated by small regulatory RNAs (sRNAs) is vital for growth and development of diverse organisms. The biogenesis of sRNAs is regulated by both positive and negative regulators known to regulate photomorphogenic development. Two microRNAs (miRNAs), miR157 and miR319, also regulate photomorphogenesis. However, genome-wide profiling of sRNAs and their regulation of target genes during photomorphogenesis has been missing. We provide a comprehensive view of sRNA-controlled gene expression in this developmental process...
July 24, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28736168/light-dependent-degradation-of-pif3-by-scf-ebf1-2-promotes-a-photomorphogenic-response-in-arabidopsis
#17
Jie Dong, Weimin Ni, Renbo Yu, Xing Wang Deng, Haodong Chen, Ning Wei
Plant seedlings emerging from darkness into the light environment undergo photomorphogenesis, which enables autotrophic growth with optimized morphology and physiology. During this transition, plants must rapidly remove photomorphogenic repressors accumulated in the dark. Among them is PHYTOCHROME-INTERACTING FACTOR 3 (PIF3), a key transcription factor promoting hypocotyl growth. Here we report that, in response to light activation of phytochrome photoreceptors, EIN3-BINDING F BOX PROTEINs (EBFs) 1 and 2 mediate PIF3 protein degradation in a manner dependent on light-induced phosphorylation of PIF3...
August 21, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28720596/elongator-regulates-hypocotyl-growth-in-darkness-and-during-photomorphogenesis
#18
Magdalena Woloszynska, Olimpia Gagliardi, Filip Vandenbussche, Steven De Groeve, Luis Alonso Baez, Pia Neyt, Sabine Le Gall, Jorge Fung, Paloma Mas, Dominique Van Der Straeten, Mieke Van Lijsebettens
Elongator promotes RNA polymerase II-mediated transcript elongation through epigenetic activities such as histone acetylation. Elongator regulates growth, development, immune response, sensitivity to drought and abscisic acid. We demonstrate that elo mutants exhibit defective hypocotyl elongation but have a normal apical hook in darkness and are hyposensitive to light during photomorphogenesis. These elo phenotypes are supported by transcriptome changes, i.e. downregulation of circadian clock components, positive regulators of skoto- or photomorphogenesis, hormonal pathways and cell wall biogenesis-related factors...
July 18, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28705537/multiple-routes-of-light-signaling-during-root-photomorphogenesis
#19
REVIEW
Hyo-Jun Lee, Young-Joon Park, Jun-Ho Ha, Ian T Baldwin, Chung-Mo Park
Plants dynamically adjust their architecture to optimize growth and performance under fluctuating light environments, a process termed photomorphogenesis. A variety of photomorphogenic responses have been studied extensively in the shoots, where diverse photoreceptors and signaling molecules have been functionally characterized. Notably, accumulating evidence demonstrates that the underground roots also undergo photomorphogenesis, raising the question of how roots perceive and respond to aboveground light. Recent findings indicate that root photomorphogenesis is mediated by multiple signaling routes, including shoot-to-root transmission of mobile signaling molecules, direct sensing of light by the roots, and light channeling through the plant body...
September 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28687557/a-pif1-pif3-hy5-bbx23-transcription-factor-cascade-affects-photomorphogenesis
#20
Xinyu Zhang, Junling Huai, Fangfang Shang, Gang Xu, Weijiang Tang, Yanjun Jing, Rongcheng Lin
Light signaling plays an essential role in controlling higher plants' early developmental process termed as photomorphogenesis. Transcriptional regulation is a vital mechanism that is orchestrated by transcription factors and other regulatory proteins working in concert to finely tune gene expression. Although many transcription factors/regulators have been characterized in the light-signaling pathway, their interregulation remains largely unknown. Here, we show that PHYTOCHROME-INTERACTING FACTOR3 (PIF3) and PIF1 transcription factors directly bind to the regulatory regions of ELONGATED HYPOCOTYL5 (HY5) and a B-box gene BBX23 and activate their expression in Arabidopsis (Arabidopsis thaliana)...
August 2017: Plant Physiology
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