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Plant Cell

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https://www.readbyqxmd.com/read/28446542/a-proteolytic-regulator-controlling-chalcone-synthase-stability-and-flavonoid-biosynthesis-in-arabidopsis
#1
Xuebin Zhang, Carolina Abrahan, Thomas A Colquhoun, Chang-Jun Liu
Flavonoids represent a large family of specialized metabolites involved in plant growth, development and adaptation. Chalcone synthase (CHS) catalyzes the first step of flavonoid biosynthesis by directing carbon flux from general phenylpropanoid metabolism to flavonoid pathway. Despite extensive characterization on its function and transcriptional regulation, the molecular basis governing its post-translational modification is enigmatic. Here, we report the discovery of a proteolytic regulator of CHS, namely KFBCHS, a Kelch domain-containing F-box protein in Arabidopsis...
April 26, 2017: Plant Cell
https://www.readbyqxmd.com/read/28442598/ethylene-regulates-differential-growth-via-big-arf-gef-dependent-post-golgi-secretory-trafficking-in-arabidopsis
#2
Kristoffer Jonsson, Yohann Boutté, Rajesh Kumar Singh, Delphine Gendre, Rishikesh Bhalerao
During early seedling development, the shoot apical meristem is protected from damage as the seedling emerges from soil by the formation of apical hook. Hook formation requires differential growth across the epidermis below the meristem in the hypocotyl. The plant hormones ethylene and auxin play key roles during apical hook development by controlling differential growth. We provide genetic and cell biological evidence for the role of ADP-ribosylation factor 1 (ARF1)-GTPase and its effector ARF-guanine-exchange factors (GEF)s of the BFA-inhibited GEF (BIG) family and GNOM in ethylene- and auxin-mediated control of hook development...
April 24, 2017: Plant Cell
https://www.readbyqxmd.com/read/28442597/the-emergence-evolution-and-diversification-of-the-mir390-tas3-arf-pathway-in-land-plants
#3
Rui Xia, Jing Xu, Blake C Meyers
In plants, miR390 directs the production of tasiRNAs from TRANS-ACTING SIRNA 3 (TAS3) transcripts to regulate AUXIN RESPONSIVE FACTOR (ARF) genes, critical for auxin signaling; these tasiRNAs are known as tasiARFs. To understand the evolution of this miR390-TAS3-ARF pathway, we characterized homologs of these three genes from thousands of plant species, from bryophytes to angiosperms. We found the lower-stem region of MIR390 genes, critical for accurate DCL1 (DICER-LIKE 1) processing, is conserved in sequence in seed plants...
April 24, 2017: Plant Cell
https://www.readbyqxmd.com/read/28442596/tissue-specific-transcriptomics-reveals-an-important-role-of-the-unfolded-protein-response-in-maintaining-fertility-upon-heat-stress-in-arabidopsis
#4
Shuang-Shuang Zhang, Hongxing Yang, Lan Ding, Ze-Ting Song, Hong Ma, Fang Chang, Jian-Xiang Liu
Elevated temperatures have a great impact on plant reproductive development and subsequent fruit and seed set, but the underlying molecular mechanisms are not well understood. We used transcriptome profiling to investigate the effect of heat stress on reproductive development of Arabidopsis (Arabidopsis thaliana) seedlings and observed distinct response patterns in vegetative vs. reproductive tissues. Exposure to heat stress affected reproductive developmental programs including early phases of anther/ovule development and meiosis, Also, genes participating in the unfolded protein response (UPR) were enriched in the reproductive tissue-specific genes that were up-regulated by heat...
April 24, 2017: Plant Cell
https://www.readbyqxmd.com/read/28420747/correction-induced-genome-wide-binding-of-three-arabidopsis-wrky-transcription-factors-during-early-mamp-triggered-immunity
#5
Imre E Somssich
No abstract text is available yet for this article.
April 18, 2017: Plant Cell
https://www.readbyqxmd.com/read/28420746/the-mitochondrial-dna-mtdna-associated-protein-swib5-influences-mtdna-architecture-and-homologous-recombination
#6
Jonas Blomme, Olivier Van Aken, Jelle Van Leene, Teddy Jégu, Riet Maria De Rycke, Michiel De Bruyne, Jasmien Vercruysse, Jonah Nolf, Twiggy Van Daele, Liesbeth De Milde, Mattias Vermeersch, Catherine Colas des Francs-Small, Geert De Jaeger, Moussa Benhamed, A Harvey Millar, Dirk Inzé, Nathalie Gonzalez
In addition to the nucleus, mitochondria and chloroplasts in plant cells also contain genomes. Efficient DNA repair pathways are crucial in these organelles to fix damage resulting from endogenous and exogenous factors. Plant organellar genomes are complex compared to their animal counterparts and although several plant-specific mediators of organelle DNA repair have been reported, many regulators remain to be identified. Here, we show that a mitochondrial SWI/SNF (nucleosome remodeling) complex B protein, SWIB5, is capable of associating with mitochondrial DNA (mtDNA) in Arabidopsis thaliana...
April 18, 2017: Plant Cell
https://www.readbyqxmd.com/read/28408661/multiomics-of-tomato-glandular-trichomes-reveals-distinct-features-of-central-carbon-metabolism-supporting-high-productivity-of-specialized-metabolites
#7
Gerd Balcke, Stefan Bennewitz, Nick Bergau, Benedikt Athmer, Anja Henning, Petra Majovsky, José M Jiménez-Gómez, Wolfgang Hoehenwarter, Alain F Tissier
Glandular trichomes are metabolic cell factories with the capacity to produce large quantities of secondary metabolites. Little is known about the connection between central carbon metabolism and metabolic productivity for secondary metabolites in glandular trichomes. To address this gap in our knowledge, we performed comparative metabolomics, transcriptomics, proteomics and 13C-labeling of type VI glandular trichomes and leaves from a cultivated (Solanum lycopersicum LA4024) and a wild (Solanum habrochaites LA1777) tomato accession...
April 13, 2017: Plant Cell
https://www.readbyqxmd.com/read/28408660/a-global-co-expression-network-approach-for-connecting-genes-to-specialized-metabolic-pathways-in-plants
#8
Jennifer H Wisecaver, Alexander T Borowsky, Vered Tzin, Georg Jander, Daniel J Kliebenstein, Antonis Rokas
Plants produce diverse specialized metabolites (SMs), but the genes responsible for their production and regulation remain largely unknown, hindering efforts to tap plant pharmacopeia. Given that genes comprising SM pathways exhibit environmentally dependent co-regulation, we hypothesized that genes within a SM pathway would form tight associations (modules) with each other in co-expression networks, facilitating their identification. To evaluate this hypothesis, we used 10 global co-expression datasets, each a meta-analysis of hundreds to thousands of experiments, across eight plant species to identify hundreds of co-expressed gene modules per dataset...
April 13, 2017: Plant Cell
https://www.readbyqxmd.com/read/28408659/chasing-scattered-genes-identifying-specialized-metabolite-pathway-genes-through-global-co-expression-analysis
#9
Jennifer A Lockhart
No abstract text is available yet for this article.
April 13, 2017: Plant Cell
https://www.readbyqxmd.com/read/28408658/meristem-doming-and-the-transition-to-reproductive-development-in-tomato
#10
Jennifer Mach
No abstract text is available yet for this article.
April 13, 2017: Plant Cell
https://www.readbyqxmd.com/read/28400492/the-molecular-dialog-between-flowering-plant-reproductive-partners-defined-by-snp-informed-rna-sequencing
#11
Alexander R Leydon, Caleb Weinreb, Elena Venable, Anke Reinders, John M Ward, Mark A Johnson
The molecular interactions between reproductive cells are critical for determining whether sexual reproduction between individuals results in fertilization and can result in barriers to interspecific hybridization. However, it is a challenge to define the complete molecular exchange between reproductive partners because parents contribute to a complex mixture of cells during reproduction. We unambiguously defined male- and female-specific patterns of gene expression during Arabidopsis reproduction using single nucleotide polymorphism-informed RNA-seq analysis...
April 11, 2017: Plant Cell
https://www.readbyqxmd.com/read/28400491/elf18-induced-long-noncoding-rna-associates-with-mediator-to-enhance-expression-of-innate-immune-response-genes-in-arabidopsis
#12
Jun Sung Seo, Hai-Xi Sun, Bong Soo Park, Chung-Hao Huang, Shyi-Dong Yeh, Choonkyun Jung, Nam-Hai Chua
The plant immune response is a complex process involving transcriptional and posttranscriptional regulation of gene expression. Responses to plant immunity are initiated upon the perception of pathogen-associated molecular patterns (PAMPs), including peptide fragment of bacterial flagellin (flg22) or translation elongation factor Tu (elf18). Here, we identify an Arabidopsis thaliana long-noncoding RNA, designated ELF18-INDUCED LONG-NONCODING RNA 1 (ELENA1), as a factor enhancing resistance against Pseudomonas syringe pv...
April 11, 2017: Plant Cell
https://www.readbyqxmd.com/read/28396554/exploiting-the-genetic-diversity-of-maize-using-a-combined-metabolomic-enzyme-activity-profiling-and-metabolic-modelling-approach-to-link-leaf-physiology-to-kernel-yield
#13
Rafael A Cañas, Zhazira Yesbergenova-Cuny, Margaret Simons, Fabien Chardon, Patrick Armengaud, Isabelle Quilleré, Caroline Cukier, Yves Gibon, Anis M Limami, Stéphane D Nicolas, Lénaïg Brulé, Peter J Lea, Costas D Maranas, Bertrand Hirel
A combined metabolomic, biochemical, fluxomic, and metabolic modelling approach was developed using nineteen genetically distant maize (Zea mays L.) lines from Europe and America. Considerable differences were detected between the lines when leaf metabolic profiles and activities of the main enzymes involved in primary metabolism were compared. During grain filling, the leaf metabolic composition appeared to be a reliable marker, allowing a classification matching the genetic diversity of the lines. During the same period, there was a significant correlation between the genetic distance of the lines and the activities of enzymes involved in carbon metabolism, notably glycolysis...
April 10, 2017: Plant Cell
https://www.readbyqxmd.com/read/28396553/saddle-up-soybean-seed-pigments-argonaute5-in-spatially-regulated-silencing-of-chalcone-synthase-genes
#14
Jennifer Mach
No abstract text is available yet for this article.
April 10, 2017: Plant Cell
https://www.readbyqxmd.com/read/28396552/the-plant-cell-reviews-plant-immunity-receptor-like-kinases-ros-rlk-crosstalk-quantitative-resistance-and-the-growth-defense-tradeoff
#15
https://www.readbyqxmd.com/read/28389586/coordination-of-meristem-doming-and-the-floral-transition-by-late-termination-a-kelch-repeat-protein
#16
Lior Tal, Gilgi Friedlander, Netta Segal Gilboa, Tamar Unger, Shlomit Gilad, Yuval Eshed
Enlargement and doming of the shoot apical meristem (SAM) is a hallmark of the transition from vegetative growth to flowering. While this change is widespread, its role in the flowering process is unknown. The late termination (ltm) tomato (Solanum lycopersicum) mutant shows severely delayed flowering and precocious doming of the vegetative SAM. LTM encodes a kelch domain-containing protein, with no link to known meristem maintenance or flowering time pathways. LTM interacts with the TOPLESS (TPL) corepressor and with several transcription factors that can provide specificity for its functions...
April 7, 2017: Plant Cell
https://www.readbyqxmd.com/read/28389585/a-two-step-model-for-de-novo-activation-of-wuschel-during-plant-shoot-regeneration
#17
Tian-Qi Zhang, Heng Lian, Chuan-Miao Zhou, Lin Xu, Yuling Jiao, Jia-Wei Wang
Plant cells are totipotent and competent to regenerate from differentiated organs. It has been known for six decades that cytokinin-rich medium induces shoot regeneration from callus cells. However, the underlying molecular mechanism remains elusive. The homeodomain transcription factor WUSCHEL (WUS) is essential for de novo establishment of the shoot stem cell niche in Arabidopsis thaliana. We found that WUS-positive cells (WUS+) mark the shoot progenitor region during regeneration. A cytokinin-rich environment initially promotes the removal of the repressive histone mark H3K27me3 at the WUS locus in a cell-cycle-dependent manner...
April 7, 2017: Plant Cell
https://www.readbyqxmd.com/read/28381444/knotted1-cofactors-blh12-and-blh14-regulate-internode-patterning-and-vein-anastomosis-in-maize
#18
Katsutoshi Tsuda, Maria Jazmin Abraham-Juarez, Akiteru Maeno, Zhaobin Dong, Dale Aromdee, Robert Meeley, Toshihiko Shiroishi, Kenichi Nonomura, Sarah Hake
Monocot stems lack the vascular cambium and instead have characteristic structures in which intercalary meristems generate internodes and veins remain separate and scattered. Developmental processes of these unique structures, however, have been poorly described. BELL1-like Homeobox (BLH) transcription factors (TFs) are known to heterodimerize with KNOTTED1-like Homeobox (KNOX) TFs to play crucial roles in shoot meristem maintenance, but their functions are elusive in monocots. We found that maize BLH12 and BLH14 have redundant but important roles in stem development...
April 5, 2017: Plant Cell
https://www.readbyqxmd.com/read/28373519/bound-by-fate-reactive-oxygen-species-in-receptor-like-kinase-signaling
#19
Sachie Kimura, Cezary Waszczak, Kerri Hunter, Michael Wrzaczek
In plants, receptor-like kinases (RLKs) and extracellular reactive oxygen species (ROS) contribute to the communication between the environment and the interior of the cell. Apoplastic ROS production is a frequent result of RLK signaling in a multitude of cellular processes. However, it is as yet unclear how ROS signaling downstream of receptor activation is executed. In this review, we provide a broad view of the intricate connections between RLKs and ROS signaling and describe the regulatory events that control and coordinate extracellular ROS production...
April 3, 2017: Plant Cell
https://www.readbyqxmd.com/read/28373518/intron-dna-sequences-can-be-more-important-than-the-proximal-promoter-in-determining-the-site-of-transcript-initiation
#20
Jenna E Gallegos, Alan B Rose
To more precisely define the positions from which certain intronic regulatory sequences increase mRNA accumulation, the effect of a UBIQUITIN intron on gene expression was tested from 6 different positions surrounding the transcription start site (TSS) of a reporter gene fusion in Arabidopsis thaliana. The intron increased expression from all transcribed positions, but had no effect when upstream of the 5'-most TSS. While this implies that the intron must be transcribed to increase expression, the TSS changed when the intron was located in the 5' UTR, suggesting that the intron affects transcription initiation...
April 3, 2017: Plant Cell
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