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Plant Cell

Hong Li, Miao Yu, Xin-Qiao Du, Zhi-Fang Wang, Wei-Hua Wu, Francisco J Quintero, Xue-Hua Jin, Hao-Dong Li, Yi Wang
Potassium and nitrogen are essential macronutrients for plant growth and have a positive impact on crop yield. Previous studies have indicated that the absorption and translocation of K+ and NO3- are correlated with each other in plants; however, the molecular mechanism that coordinates K+ and NO3- transport remains unknown. In this study, using a forward genetic approach, we isolated a low-K+-sensitive Arabidopsis mutant lks2 that showed a leaf-chlorosis phenotype under low-K+ conditions. LKS2 encodes the transporter NRT1...
July 24, 2017: Plant Cell
Cezary Smaczniak, Jose M Muiño, Dijun Chen, Gerco C Angenent, Kerstin Kaufmann
Floral organ identities in plants are specified by the combinatorial action of homeotic master regulatory transcription factors. How these factors achieve their regulatory specificities is however still largely unclear. Genome-wide in vivo DNA binding data show that homeotic MADS-domain proteins recognize partly distinct genomic regions, suggesting that DNA binding specificity contributes to functional differences of homeotic protein complexes. We used in vitro systematic evolution of ligands by exponential enrichment followed by high throughput DNA sequencing (SELEX-seq) on several floral MADS-domain protein homo- and heterodimers to measure their DNA-binding specificities...
July 21, 2017: Plant Cell
Yang Zhang, Daniel W Ngu, Daniel Carvalho, Zhikai Liang, Yumou Qiu, Rebecca Roston, James Schnable
Identifying interspecies changes in gene regulation, one of the two primary sources of phenotypic variation, is challenging on a genome-wide scale. The use of paired time course data on cold-responsive gene expression in maize (Zea mays) and sorghum (Sorghum bicolor) allowed us to identify differentially regulated orthologs. While the majority of cold-responsive transcriptional regulation of conserved gene pairs is species specific, the initial transcriptional responses to cold appear to be more conserved than later responses...
July 21, 2017: Plant Cell
William R Chezem, Altamash Memon, Fu-Shuang Li, Jing-Ke Weng, Nicole Kho Clay
Lignification of cell wall appositions is a conserved basal defense mechanism in the plant innate immune response. However, the genetic pathway controlling defense-induced lignification remains unknown. Here, we demonstrate the Arabidopsis thaliana SG2-type R2R3-MYB transcription factor MYB15 as a regulator of defense-induced lignification and basal immunity. Loss of MYB15 reduces the content but not the composition of defense-induced lignin, whereas constitutive expression of MYB15 increases lignin content independently of immune activation...
July 21, 2017: Plant Cell
Minmin Du, Jiuhai Zhao, David T W Tzeng, Yuanyuan Liu, Lei Deng, Tianxia Yang, Qingzhe Zhai, Fangming Wu, Zhuo Huang, Ming Zhou, Qiaomei Wang, Qian Chen, Silin Zhong, Chang-Bao Li, Chuanyou Li
The hormone jasmonate (JA), which functions in plant immunity, regulates resistance to pathogen infection and insect attack through triggering genome-wide transcriptional reprogramming in plants. We show that the basic helix-loop-helix transcription factor (TF) MYC2 in tomato (Solanum lycopersicum) acts downstream of the JA receptor to orchestrate JA-mediated activation of both the wounding and pathogen responses. Using chromatin immunoprecipitation sequencing (ChIP-seq) coupled with RNA sequencing (RNA-seq) assays, we identified 655 MYC2-targeted JA-responsive genes...
July 21, 2017: Plant Cell
Eliana Gonzales-Vigil, Charles A Hefer, Michelle E von Loessl, Jonathan La Mantia, Shawn D Mansfield
Alkenes are linear hydrocarbons with one or more double bonds. Despite their potential as biofuels and precursors for specialty chemicals, the underlying biochemistry and genetics of alkene biosynthesis in plants remain elusive. Here, we report on a screen of natural accessions of poplar (Populus trichocarpa) revealing that the leaf cuticular waxes are predominantly composed of alkanes and alkenes. Interestingly, the accumulation of alkenes increases with leaf development, is limited to the abaxial side of the leaf, and is impaired in a few accessions...
July 20, 2017: Plant Cell
Jennifer Mach
No abstract text is available yet for this article.
July 17, 2017: Plant Cell
Nancy Rosenbaum Hofmann
No abstract text is available yet for this article.
July 17, 2017: Plant Cell
Peter Alexander Crisp, Diep Ganguly, Aaron B Smith, Kevin D Murray, Gonzalo M Estavillo, Iain R Searle, Ethan Ford, Ozren Bogdanović, Ryan Lister, Justin O Borevitz, Steven R Eichten, Barry J Pogson
Stress recovery may prove to be a promising approach to increase plant performance, and theoretically, mRNA instability may facilitate faster recovery. Transcriptome (RNA-seq, qPCR, sRNA-seq, PARE) and methylome profiling during repeated excess-light stress and recovery was performed at intervals as short as three minutes. We demonstrate that 87% of the stress-upregulated mRNAs analysed exhibit very rapid recovery. For instance, HSP101 abundance declined two-fold every 5.1 minutes. We term this phenomenon Rapid Recovery Gene Downregulation (RRGD), whereby mRNA abundance rapidly decreases promoting transcriptome resetting...
July 13, 2017: Plant Cell
Jennifer Mach
No abstract text is available yet for this article.
July 13, 2017: Plant Cell
Josh Strable, Jason G Wallace, Erica Unger-Wallace, Sarah Briggs, Peter Bradbury, Edward S Buckler, Erik Vollbrecht
Leaf architecture directly influences canopy structure, consequentially affecting yield. We discovered a maize (Zea mays) mutant with aberrant leaf architecture, which we named drooping leaf1 (drl1). Pleiotropic mutations in drl1 affect leaf length and width, leaf angle, and internode length and diameter. These phenotypes are enhanced by natural variation at the drl2 enhancer locus, including reduced expression of the drl2-Mo17 allele in the Mo17 inbred. A second drl2 allele, produced by transposon mutagenesis, interacted synergistically with drl1 mutants and reduced drl2 transcript levels...
July 11, 2017: Plant Cell
Jennifer A Lockhart
No abstract text is available yet for this article.
July 11, 2017: Plant Cell
Steven A Moussu, Nicolas M Doll, Sophy Chamot, Lysiane Brocard, Audrey Creff, Chloé Fourquin, Thomas Widiez, Zachary L Nimchuk, Gwyneth C Ingram
Arabidopsis (Arabidopsis thaliana) seed development requires the concomitant development of two zygotic compartments, the embryo and the endosperm. Following fertilization, the endosperm expands and the embryo grows invasively through the endosperm, which breaks down. Here we describe a structure we refer to as the embryo sheath that forms on the surface of the embryo as it starts to elongate. The sheath is deposited outside the embryonic cuticle, and incorporates endosperm-derived material rich in extensin-like molecules...
July 10, 2017: Plant Cell
Qing Hu, Yafei Li, Hongjun Wang, Yi Shen, Chao Zhang, Guijie Du, Ding Tang, Zhukuan Cheng
Homologous recombination plays a central role in guaranteeing chromosome segregation during meiosis. The precise regulation of the resolution of recombination intermediates is critical for the success of meiosis. Many proteins, including the RECQ DNA helicases (Sgs1/BLM) and Topoisomerase 3α (TOP3α), have essential functions in managing recombination intermediates. However, many other factors involved in this process remain to be defined. Here we report the isolation of meiotic chromosome association 1 (MEICA1), a novel protein participating in meiotic recombination in rice (Oryza sativa)...
July 10, 2017: Plant Cell
Kun Wang, John E Froehlich, Agnieszka Zienkiewicz, Hope Lynn Hersh, Christoph Benning
The lipid composition of thylakoid membranes inside chloroplasts is conserved from leaves to developing embryos. A finely tuned lipid assembly machinery is required to build these membranes during Arabidopsis thaliana development. Contrary to thylakoid lipid biosynthetic enzymes, the functions of most predicted chloroplast lipid-degrading enzymes remain to be elucidated. Here, we explore the biochemistry and physiological function of an Arabidopsis thylakoid membrane-associated lipase, PLASTID LIPASE1 (PLIP1)...
July 6, 2017: Plant Cell
Christopher Neil Hunter
No abstract text is available yet for this article.
July 6, 2017: Plant Cell
David Seung, Julien Boudet, Jonathan D Monroe, Tina B Schreier, Laure C David, Melanie Abt, Kuan-Jen Lu, Martina Zanella, Samuel C Zeeman
The molecular mechanism that initiates the synthesis of starch granules is poorly understood. Here, we discovered two plastidial proteins involved in granule initiation in Arabidopsis thaliana leaves. Both contain coiled-coils and a family-48 carbohydrate binding module (CBM48) and are homologs of the PROTEIN TARGETING TO STARCH (PTST) protein; thus, we named them PTST2 and PTST3. Chloroplasts in mesophyll cells typically contain 5-7 granules, but remarkably, most chloroplasts in ptst2 mutants contained zero or one large granule...
July 6, 2017: Plant Cell
Tao Wang, Jiangli Dong, Rongxue Zhang, Fugui Zhu, Zhenqian Zhang, Lanming Gou, Jiangqi Wen, Mei Duan
The plant-specific NAC (NAM, ATAF½ and CUC2) transcription factors (TFs) play a vital role in response to drought stress. Here, we report a lipid-anchored NACsa TF in Medicago falcata. MfNACsa is an essential regulator of plant tolerance to drought stress, resulting in the differential expression of genes involved in oxidation-reduction, lipid transport and localization. MfNACsa is associated with membranes under unstressed conditions, and more specifically, it is targeted to the plasma membrane through S-palmitoylation...
July 6, 2017: Plant Cell
Jocelyn Bédard, Raphael Trösch, Feijie Wu, Qihua Ling, Úrsula Flores-Pérez, Mats Töpel, Fahim Nawaz, Paul Jarvis
To extend our understanding of chloroplast protein import and the role played by the import machinery component Tic40, we performed a genetic screen for suppressors of chlorotic tic40 knockout mutant Arabidopsis plants. As a result, two suppressor of tic40 loci, stic1 and stic2, were identified and characterized. The stic1 locus corresponds to the gene ALBINO4 (ALB4), which encodes a paralog of the well-known thylakoid protein targeting factor ALBINO3 (ALB3). The stic2 locus identified a previously unknown stromal protein that interacts physically with both ALB4 and ALB3...
July 6, 2017: Plant Cell
Céline Duc, Matthias Benoit, Gwénaëlle Détourné, Lauriane Simon, Axel Poulet, Matthieu Jung, Alaguraj Veluchamy, David Latrasse, Samuel Le Goff, Sylviane Cotterell, Christophe Tatout, Moussa Benhamed, Aline V Probst
Histones are essential components of the nucleosome, the major chromatin subunit that structures linear DNA molecules and regulates access of other proteins to DNA. Specific histone chaperone complexes control the correct deposition of canonical histones and their variants to modulate nucleosome structure and stability. In this study, we characterize the Arabidopsis Alpha Thalassemia-mental Retardation X-linked (ATRX) ortholog and show that ATRX is involved in histone H3 deposition. Arabidopsis ATRX mutant alleles are viable, but show developmental defects and reduced fertility...
July 6, 2017: Plant Cell
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