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Plant Cell

Mayuki Tanaka, Naoyuki Sotta, Yusuke Yamazumi, Yui Yamashita, Kyoko Miwa, Katsunori Murota, Yukako Chiba, Masami Yokota Hirai, Tetsu Akiyama, Hitoshi Onouchi, Satoshi Naito, Toru Fujiwara
Upstream open reading frames (uORFs) are often translated ahead of the main ORF of a gene and regulate gene expression, sometimes in a condition-dependent manner, but such a role for the minimum uORF (hereafter referred to as 'AUG-stop') in living organisms is currently unclear. Here, we show that AUG-stop plays an important role in the boron (B)-dependent regulation of NIP5;1, encoding a boric acid channel required for normal growth under low B conditions in Arabidopsis thaliana. High B enhanced ribosome stalling at AUG-stop, which was accompanied by the suppression of translation and mRNA degradation...
October 19, 2016: Plant Cell
Laure D Sultan, Daria Mileshina, Felix Grewe, Katarzyna Rolle, Sivan Abudraham, Paweł Głodowicz, Adnan Khan Niazi, Ido Keren, Sofia Shevtsov, Liron Klipcan, Jan Barciszewski, Jeffrey P Mower, Andre Dietrich, Oren Ostersetzer
Group II introns are large catalytic RNAs that are ancestrally related to nuclear spliceosomal introns. Sequences corresponding to group II RNAs are found in many prokaryotes and are particularly prevalent within plants organellar genomes. Proteins encoded within the introns themselves (maturases) facilitate the splicing of their own host pre-RNAs. Mitochondrial introns in plants have diverged considerably in sequence and have lost their maturases. In angiosperms, only a single maturase has been retained in the mitochondrial DNA: the matR gene found within NADH dehydrogenase 1 (nad1) intron 4...
October 19, 2016: Plant Cell
Sabeeha S Merchant, Nancy Eckardt
No abstract text is available yet for this article.
October 18, 2016: Plant Cell
Petra Žádníková, Krzysztof Wabnik, Anas Abuzeineh, Marҫal Gallemí, Dominique Van Der Straeten, Richard S Smith, Dirk Inzé, Jiří Friml, Przemyslaw Prusinkiewicz, Eva Benkova
Differential cell growth enables flexible organ bending in the presence of environmental signals such as light or gravity. A prominent example of the developmental processes based on differential cell growth is the formation of the apical hook that protects the fragile shoot apical meristem when it breaks through the soil during germination. Here, we combined in silico and in vivo approaches to identify a minimal mechanism producing auxin gradient-guided differential growth during the establishment of the apical hook in the model plant Arabidopsis thaliana...
October 17, 2016: Plant Cell
Gregory Bertoni
No abstract text is available yet for this article.
October 17, 2016: Plant Cell
Cheng-Yu Hou, Wen-Chi Lee, Hsiao-Chun Chou, Ai-Ping Chen, Shu-Jen Chou, Ho-Ming Chen
High-throughput approaches for profiling the 5' ends of RNA degradation intermediates on a genome-wide scale are frequently applied to analyze and validate cleavage sites guided by microRNAs (miRNAs). However, the complexity of the RNA degradome other than miRNA targets is currently largely uncharacterized, and this limits the application of RNA degradome studies. We conducted a global analysis of 5'-truncated mRNA ends that mapped to coding sequences (CDSs) of Arabidopsis (Arabidopsis thaliana), rice (Oryza sativa) and soybean (Glycine max)...
October 14, 2016: Plant Cell
Pieter Clauw, Frederik Coppens, Arthur Korte, Dorota Herman, Bram Slabbinck, Stijn Dhondt, Twiggy Van Daele, Liesbeth De Milde, Mattias Vermeersch, Katrien Maleux, Steven Maere, Nathalie Gonzalez, Dirk Inzé
Plant growth and crop yield are negatively affected by a reduction in water availability. However, a clear understanding of how growth is regulated under non-lethal drought conditions is lacking. Recent advances in genomics, phenomics and transcriptomics allow in-depth analysis of natural variation. In this study, we conducted a detailed screening of leaf growth responses to mild drought in a worldwide collection of Arabidopsis thaliana accessions. The genetic architecture of the growth responses upon mild drought was investigated by subjecting the different leaf growth phenotypes to genome-wide association mapping and by characterizing the transcriptome of young developing leaves...
October 11, 2016: Plant Cell
Marlene Reichel, Yalin Liao, Mandy Rettel, Chikako Ragan, Maurits Evers, Anne-Marie Alleaume, Rastislav Horos, Matthias W Hentze, Thomas Preiss, Anthony A Millar
RNA-binding proteins (RBPs) control the fate and expression of a transcriptome. Despite this fundamental importance, our understanding of plant RBPs is rudimentary, being mainly derived via bioinformatic extrapolation from other kingdoms. Here, we have adapted the mRNA-protein interactome capture method to investigate the RNA-binding proteome in planta. From Arabidopsis thaliana (At) etiolated seedlings, we captured more than 700 proteins, including 300 with high confidence that we have defined as the At-RBP set...
October 11, 2016: Plant Cell
Xiang Yu, Matthew R Willmann, Stephen J Anderson, Brian D Gregory
RNA turnover is necessary for controlling proper mRNA levels post-transcriptionally. In general, RNA degradation is via exoribonucleases that degrade RNA either from the 5' end to the 3' end, such as XRN4, or in the opposite direction by the multi-subunit exosome complex. Here, we use genome-wide mapping of uncapped and cleaved transcripts to reveal the global landscape of co-translational mRNA decay in the Arabidopsis thaliana transcriptome. We found that this process leaves a clear three nucleotide periodicity in open reading frames...
October 7, 2016: Plant Cell
Jaewook Kim, Kijong Song, Eunae Park, Keunhwa Kim, Gabyong Bae, Giltsu Choi
Seedling hypocotyls display negative gravitropism in the dark but agravitropism in the light. The Arabidopsis thaliana pif quadruple mutant (pifQ), which lacks four PHYTOCHROME-INTERACTING FACTORS (PIFs), is agravitropic in the dark. Endodermis-specific expression of PIF1 rescues gravitropism in pifQ mutant seedlings. Since phytochromes induce light responses by inhibiting PIFs and the COP1-SPA ubiquitin E3 ligase complex in the nucleus, we asked whether phyB can cell autonomously inhibit hypocotyl negative gravitropism in the endodermis...
October 6, 2016: Plant Cell
Pingtao Ding, Dmitrij Rekhter, Yuli Ding, Kirstin Feussner, Lucas Busta, Sven Haroth, Shaohua Xu, Xin Li, Reinhard Jetter, Ivo Feussner, Yuelin Zhang
Systemic acquired resistance (SAR) is an immune response induced in the distal parts of plants following defense activation in local tissue. Pipecolic acid (Pip) accumulation orchestrates SAR and local resistance responses. Here we report the identification and characterization of SAR-DEFICIENT 4 (SARD4), which encodes a critical enzyme for Pip biosynthesis in Arabidopsis thaliana. Loss of function of SARD4 leads to reduced Pip levels and accumulation of a Pip precursor, Δ1-piperideine-2-carboxylic acid (P2C)...
October 6, 2016: Plant Cell
Chih-Hao Chang, Fu-Chen Hsu, Shu-Chuan Lee, Yih-Shan Lo, Jiun-Da Wang, Jane Shaw, Michael Taliansky, Ban-Yang Chang, Yau-Heiu Hsu, Na-Sheng Lin
RNA trafficking plays pivotal roles in regulating plant development, gene silencing, and adaptation to environmental stress. Satellite RNAs (satRNAs), parasites of viruses, depend on their helper viruses (HVs) for replication, encapsidation, and efficient spread. However, it remains largely unknown how satRNAs interact with viruses and the cellular machinery to undergo trafficking. Here, we show that the P20 protein of Bamboo mosaic potexvirus satRNA (satBaMV) can functionally complement in trans the systemic trafficking of P20-defective satBaMV in infected Nicotiana benthamiana...
October 4, 2016: Plant Cell
Youngmin Park, Zheng-Yi Xu, Soo Youn Kim, Jihyeong Lee, Bongsoo Choi, Juhun Lee, Hyeran Kim, Hee-Jung Sim, Inhwan Hwang
The phytohormone abscisic acid (ABA) plays crucial roles in various physiological processes, including responses to abiotic stresses, in plants. Recently, multiple ABA transporters were identified. The loss-of-function and gain-of-function mutants of these transporters show altered ABA sensitivity and stomata regulation, highlighting the importance of ABA transporters in ABA-mediated processes. However, how the activity of these transporters is regulated remains elusive. Here, we show that spatial regulation of ABCG25, an ABA exporter, is an important mechanism to control its activity...
October 3, 2016: Plant Cell
Hanna Hõrak, Maija Sierla, Kadri Tõldsepp, Cun Wang, Yuh-Shuh Wang, Maris Nuhkat, Ervin Valk, Priit Pechter, Ebe Merilo, Jarkko Salojärvi, Kirk Overmyer, Mart Loog, Mikael Brosche, Julian I Schroeder, Jaakko Kangasjärvi, Hannes Kollist
Activation of the guard cell S-type anion channel SLAC1 is important for stomatal closure in response to diverse stimuli, including elevated CO2. The majority of known SLAC1 activation mechanisms depend on abscisic acid (ABA) signaling. Several lines of evidence point to a parallel ABA-independent mechanism of CO2-induced stomatal regulation; however, molecular details of this pathway remain scarce. Here, we isolated a dominant mutation in the protein kinase HIGH LEAF TEMPERATURE1 (HT1), an essential regulator of stomatal CO2 responses, in an ozone-sensitivity screen of Arabidopsis thaliana...
September 30, 2016: Plant Cell
Manuel Adrian Troncoso-Ponce, Guillaume Barthole, Geoffrey Tremblais, Alexandra To, Martine Miquel, Loic Lepiniec, Sébastien Baud
In angiosperms, double fertilization of the embryo sac initiates the development of the embryo and the endosperm. In Arabidopsis thaliana, an exalbuminous species, the endosperm is reduced to one cell layer during seed maturation and reserves such as oil are massively deposited in the enlarging embryo. Here, we consider the strikingly different fatty acid (FA) compositions of the oils stored in the two zygotic tissues. Endosperm oil is enriched in ω-7 monounsaturated FAs, that represent more than 20 Mol% of total FAs, whereas these molecular species are ten-fold less abundant in the embryo...
September 28, 2016: Plant Cell
Nancy Rosenbaum Hofmann
No abstract text is available yet for this article.
September 28, 2016: Plant Cell
Manaki Mimura, Rémi Zallot, Thomas Daniel Niehaus, Ghulam Hasnain, Satinder K Gidda, Thuy Nd Nguyen, Erin M Anderson, Robert T Mullen, Greg Brown, Alexander F Yakunin, Valerié de Crécy-Lagard, Jesse F Gregory, Donald R McCarty, Andrew D Hanson
To synthesize the cofactor thiamin diphosphate (ThDP), plants must first hydrolyze thiamin monophosphate (ThMP) to thiamin, but dedicated enzymes for this hydrolysis step were unknown and widely doubted to exist. The classical thiamin-requiring th2-1 mutation in Arabidopsis was shown to reduce ThDP levels by half and to increase ThMP levels five-fold, implying that the THIAMIN REQUIRING 2 (TH2) gene product could be a dedicated ThMP phosphatase. Genomic and transcriptomic data indicated that TH2 corresponds to At5g32470, encoding a HAD (haloacid dehalogenase) family phosphatase fused to a TenA (thiamin salvage) family protein...
September 27, 2016: Plant Cell
Stephen Ridge, Frances C Sussmilch, Valerie Fg Hecht, Jacqueline K Vander Schoor, Robyn Lee, Gregoire Aubert, Judith Burstin, Richard C Macknight, James L Weller
The molecular pathways responsible for the flowering response to photoperiod have been extensively studied in Arabidopsis thaliana and cereals, but remain poorly understood in other major plant groups. Here, we describe a dominant mutant at the LATE BLOOMER2 (LATE2) locus in pea (Pisum sativum) that is late-flowering with a reduced response to photoperiod. LATE2 acts downstream of light signalling and the circadian clock to control expression of the main photoperiod-regulated FT gene, FTb2, implying that it plays a primary role in photoperiod measurement...
September 26, 2016: Plant Cell
Jennifer Mach
No abstract text is available yet for this article.
September 26, 2016: Plant Cell
Annett Richter, Claudia Schaff, Zhiwu Zhang, Alexander E Lipka, Feng Tian, Tobias G Köllner, Christiane Schnee, Susanne Preiss, Sandra Irmisch, Georg Jander, Wilhelm Boland, Jonathan Gershenzon, Edward S Buckler, Jorg Degenhardt
Plant volatiles not only have multiple defense functions against herbivores, fungi, and bacteria, but also have been implicated in signaling within the plant and towards other organisms. Elucidating the function of individual plant volatiles will require more knowledge of their biosynthesis and regulation in response to external stimuli. By exploiting the variation of herbivore-induced volatiles among 26 maize (Zea mays) inbred lines, we conducted a nested association mapping (NAM) and genome-wide association study (GWAS) to identify a set of quantitative trait loci (QTLs) for investigating the pathways of volatile terpene production...
September 23, 2016: Plant Cell
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