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Photomorphogenesis

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https://www.readbyqxmd.com/read/29286868/elongator-promotes-germination-and-early-post-germination-growth
#1
Magdalena Wołoszyńska, Olimpia Gagliardi, Filip Vandenbussche, Mieke Van Lijsebettens
The Elongator complex interacts with RNA polymerase II and via histone acetylation and DNA demethylation facilitates epigenetically the transcription of genes involved in diverse processes in plants, including growth, development, and immune response. Recently, we have shown that the Elongator complex promotes hypocotyl elongation and photomorphogenesis in Arabidopsis thaliana by regulating the photomorphogenesis and growth-related gene network that converges on genes implicated in cell wall biogenesis and hormone signaling...
December 29, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/29284741/converging-energy-and-hormonal-signalling-control-meristem-activity-leaf-initiation-and-growth
#2
Binish Mohammed, Sara Farahi Bilooei, Robert Doczi, Elliot Grove, Saana Railo, Klaus Palme, Franck Anicet Ditengou, László Bögre, Enrique Lopez-Juez
The development of leaf primordia is subject to light control of meristematic activity. Light regulates the expression of thousands of genes with roles in cell proliferation, organ development and differentiation of photosynthetic cells. Previous work has highlighted roles for hormone homeostasis and the energy-dependent TOR kinase in meristematic activity, yet a picture of how these two regulatory mechanisms depend on light perception and interact with each other is yet to emerge. Their relevance beyond leaf initiation is also unclear...
December 28, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29281724/hsp90c-interacts-with-psbo1-and-facilitates-its-thylakoid-distribution-from-chloroplast-stroma-in-arabidopsis
#3
Tim Jiang, Edward Saehong Oh, Diana Bonea, Rongmin Zhao
Arabidopsis plastidic HSP90C is an HSP90 family molecular chaperone that is required for chloroplast development and function. To understand the mechanism of action of HSP90C within the chloroplast, we conducted a yeast two-hybrid screening and revealed it interacts directly with the photosystem II extrinsic protein PsbO1, which performs a canonical function in the thylakoid lumen. To understand the biological significance of HSP90C-PsbO1 interaction, we investigated the role of HSP90C in modulating the stromal and thylakoid distribution of PsbO1GFP fusion protein...
2017: PloS One
https://www.readbyqxmd.com/read/29259103/the-b-box-domain-protein-bbx21-promotes-photomorphogenesis
#4
Dongqing Xu, Yan Jiang, Jian Li, Magnus Holm, Xing Wang Deng
B-box containing (BBX) proteins play critical roles in a variety of cellular and developmental processes in plants. BBX21 (also known as SALT TOLERANCE HOMOLOG 2), which contains two B-box domains in tandem at the N-terminus, has been previously demonstrated as a key component involved in the COP1-HY5 signaling hub. However, the exact molecular and physiological roles of B-box domains in BBX21 are largely unclear. Here, we found that structurally disruption of the second B-box domain, but not the first one, in BBX21 completely abolishes its biological and physiological activity in conferring hyper-photomorphogenetic phenotype in Arabidopsis...
December 19, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29250082/physiological-and-proteomic-analysis-of-the-rice-mutant-cpm2-suggests-a-negative-regulatory-role-of-jasmonic-acid-in-drought-tolerance
#5
Rohit Dhakarey, Manish L Raorane, Achim Treumann, Preshobha K Peethambaran, Rachel R Schendel, Vaidurya P Sahi, Bettina Hause, Mirko Bunzel, Amelia Henry, Ajay Kohli, Michael Riemann
It is widely known that numerous adaptive responses of drought-stressed plants are stimulated by chemical messengers known as phytohormones. Jasmonic acid (JA) is one such phytohormone. But there are very few reports revealing its direct implication in drought related responses or its cross-talk with other phytohormones. In this study, we compared the morpho-physiological traits and the root proteome of a wild type (WT) rice plant with its JA biosynthesis mutant coleoptile photomorphogenesis 2 (cpm2), disrupted in the allene oxide cyclase (AOC) gene, for insights into the role of JA under drought...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29244171/arabidopsis-mkk10-mpk6-mediates-red-light-regulated-opening-of-seedling-cotyledons-through-phosphorylation-of-pif3
#6
Xiaoyun Xin, Wenhao Chen, Bo Wang, Fan Zhu, Yuan Li, Hailian Yang, Jigang Li, Dongtao Ren
Photomorphogenesis is an important process in which seedlings emerge from soil and begin autotrophic growth. Mechanisms of photomorphogenesis include light signal perception, signal transduction, and the modulation of expression of light-responsive genes, ultimately leading to cellular and developmental changes. Phytochrome-interacting factors (PIFs) play negative regulatory roles in photomorphogenesis. Light-induced activation of phytochromes triggers rapid phosphorylation and degradation of PIFs, but the kinases responsible for the phosphorylation of PIFs are largely unknown...
December 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29220548/haem-oxygenase-a-functionally-diverse-enzyme-of-photosynthetic-organisms-and-its-role-in-phytochrome-chromophore-biosynthesis-cellular-signalling-and-defence-mechanisms
#7
REVIEW
Lovely Mahawar, G S Shekhawat
Haem oxygenase (HO) is a universal enzyme that catalyzes stereospecific clevage of haem to BV IX α and liberates Fe+2 ion and CO as byproduct. Beside haem degradation, it has important functions in plants that include cellular defence, stomatal regulation, iron mobilization, phytochrome chromophore synthesis and lateral root formation. Phytochromes are an extended family of photoreceptors with a molecular mass of 250 kDa and occur as a dimer made up of two equivalent subunits of 125 kDa each. Each subunit is made of two components; the chromophore, a light capturing pigment molecule and the apoprotein...
December 8, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/29143279/arabidopsis-noncoding-rna-modulates-seedling-greening-during-deetiolation
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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