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Plant Cell | Page 2

Yang Liu, Hongbin Wei, Mengdi Ma, Quanquan Li, Dexin Kong, Juan Sun, Xiaojing Ma, Baobao Wang, Cuixia Chen, Yurong Xie, Haiyang Wang
Increasing crop yield per unit area can be achieved by increasing planting density. However, high-density planting could trigger shade avoidance responses, which cause exaggerated growth (thus more prone to lodging) and increased susceptibility to various diseases. Previous studies have shown that the rapid elongation of plants under shade (with reduced R/FR ratios) is regulated by phytochromes and various plant hormones. However, the detailed molecular mechanisms governing the interaction among these signaling pathways are not well understood...
July 16, 2019: Plant Cell
Dmitry Lapin, Viera Kovacova, Xinhua Sun, Joram A Dongus, Deepak D Bhandari, Patrick von Born, Jaqueline Bautor, Nina Guarneri, Jakub Rzemieniewski, Johannes Stuttmann, Andreas Beyer, Jane E Parker
Plant intracellular nucleotide-binding/leucine-rich repeat (NLR) immune receptors are activated by pathogen effectors to trigger host defenses and cell death. Toll-Interleukin1-receptor (TIR)-domain NLRs (TNLs) converge on the Enhanced Disease Susceptibility1 (EDS1) family of lipase-like proteins for all resistance outputs. In Arabidopsis TNL immunity, AtEDS1 heterodimers with Phytoalexin Deficient4 (AtPAD4) transcriptionally boost basal defense pathways. AtEDS1 uses the same surface to interact with PAD4-related Senescence-Associated Gene101 (AtSAG101), but the role of AtEDS1-AtSAG101 heterodimers was unclear...
July 16, 2019: Plant Cell
Lucas Vanhaelewyn, András Viczián, Els Prinsen, Péter Bernula, Alejandro M Serrano, Maria V Arana, Carlos L Ballare, Ferenc Nagy, Dominique Van Der Straeten, Filip J Vandenbussche
In the course of evolution, plants have developed mechanisms to orient their organs towards the incoming light. At the seedling stage, positive phototropism is mainly regulated by phototropin photoreceptors in blue and ultraviolet wavelengths. Contrasting with this, we report that UV RESISTANCE LOCUS 8 (UVR8) serves as predominant photoreceptor of UV-B-induced phototropic responses in inflorescence stems. We examined the molecular mechanisms behind this response and our findings support the Blaauw theory (1919), suggesting rapid differential growth through unilateral photomorphogenic growth inhibition...
July 9, 2019: Plant Cell
Alex Harkess
No abstract text is available yet for this article.
July 9, 2019: Plant Cell
Tina B Schreier, Martin Umhang, Sang-Kyu Lee, Wei-Ling Lue, Zhouxin Shen, Dylan Silver, Alexander Graf, Antonia Müller, Simona Eicke, Martha Stadler, David Seung, Sylvain Bischof, Steven Paul Briggs, Oliver Kötting, Greg B Moorhead, Jychian Chen, Samuel C Zeeman
In Arabidopsis leaves, starch is synthesized during the day and degraded at night to fuel growth and metabolism. Starch is degraded primarily by β-amylases, liberating maltose, but this activity is preceded by glucan phosphorylation and accompanied by dephosphorylation. A member of the glucan phosphatase family, LIKE SEX FOUR 1 (LSF1), binds starch and is required for normal starch degradation, but its exact role is unclear. Here, we show that LSF1 does not dephosphorylate glucans. The recombinant Dual Specificity Phosphatase (DSP) domain of LSF1 had no detectable phosphatase activity...
July 2, 2019: Plant Cell
Johannes Gantner, Jana Ordon, Carola Kretschmer, Raphael Guerois, Johannes Stuttmann
Heterodimeric complexes containing the lipase-like protein ENHANCED DISEASE SUSCEPTIBILITY1 (EDS1) are regarded as central regulators of plant innate immunity. In this context, a complex of EDS1 with PHYTOALEXIN DEFICIENT4 (PAD4) is required for basal resistance and signaling downstream of immune receptors containing an N-terminal Toll-interleukin-1 receptor-like domain (TNLs) in Arabidopsis thaliana. Here we analyze EDS1 functions in the model Solanaceous plant Nicotiana benthamiana (Nb). Stable Nb mutants deficient in EDS1 complexes are not impaired in basal resistance, a finding which contradicts a general role for EDS1 in immunity...
July 2, 2019: Plant Cell
Harriet T Parsons, Tim J Stevens, Heather E McFarlane, Silvia Vidal-Melgosa, Johannes Griss, Nicola Lawrence, Richard Butler, Mirta M L Sousa, Michelle Salemi, William George Tycho Willats, Christopher J Petzold, Joshua L Heazlewood, Kathryn S Lilley
The order of enzymatic activity across Golgi cisternae is essential for complex molecule biosynthesis. However, an inability to separate Golgi cisternae has meant the cisternal distribution of most resident proteins, and their underlying localization mechanisms, are unknown. Here, we exploit differences in surface charge of intact cisternae to perform the first separation of early to late Golgi sub-compartments. We determine protein and glycan abundance profiles across the Golgi; over 390 resident proteins are identified, including 136 new additions, with over 180 cisternal assignments...
July 2, 2019: Plant Cell
Jason Sims, Gregory P Copenhaver, Peter Schlögelhofer
Ribosomal RNA genes are arranged in large arrays with hundreds of rDNA units in tandem. These highly repetitive DNA elements pose a risk to genome stability since they can undergo non-allelic exchanges. During meiosis DNA double strand breaks (DSBs) are induced as part of the regular program to generate gametes. Meiotic DSBs initiate homologous recombination (HR) which subsequently ensures genetic exchange and chromosome disjunction. In Arabidopsis thaliana we demonstrate that all 45S rDNA arrays become transcriptionally active and are recruited into the nucleolus early in meiosis...
July 2, 2019: Plant Cell
Ruijiao Xin, Praveen Kumar Kathare, Enamul Huq
Light signals perceived by the phytochrome family of photoreceptors control gene expression at both transcriptional and post-transcriptional levels to promote photomorphogenesis. Recently, we identified a factor called SPLICING FACTOR FOR PHYTOCHROME SIGNALING (SFPS) which directly interacts with the photoreceptor phyB and regulates pre-mRNA splicing. To identify SFPS-interacting proteins, we performed an immunoprecipitation followed by a mass spectrometry and identified the SR-like protein REDUCED RED-LIGHT RESPONSES IN CRY1CRY2 BACKGROUND 1 (RRC1)...
July 2, 2019: Plant Cell
Philip Carella
No abstract text is available yet for this article.
July 2, 2019: Plant Cell
Emily Breeze
No abstract text is available yet for this article.
July 2, 2019: Plant Cell
Patrice A Salomé
No abstract text is available yet for this article.
July 2, 2019: Plant Cell
Margaret Frank, Alex Harkess, Jacob D Washburn
No abstract text is available yet for this article.
July 2, 2019: Plant Cell
Yunxia He, Juan Xu, Xiaoyang Wang, Xiaomeng He, Yangxiayu Wang, Jinggeng Zhou, Shuqun Zhang, Xiangzong Meng
Plant defense often depends on the synthesis and targeted delivery of antimicrobial metabolites at pathogen contact sites. The pleiotropic drug resistance (PDR) transporter PENETRATION3 (PEN3)/PDR8 in Arabidopsis thaliana has been implicated in resistance to a variety of fungal pathogens. However, the antimicrobial metabolite(s) transported by PEN3 for extracellular defense remain unidentified. Here, we report that PEN3 functions redundantly with another PDR transporter (PDR12) to mediate the secretion of camalexin, the major phytoalexin in Arabidopsis...
June 25, 2019: Plant Cell
Julio Saez-Vasquez, Michel Delseny
The transcription of 18S, 5.8S and 18S rRNA genes (45S rDNA), co-transcriptional processing of pre-rRNA and assembly of mature rRNA with ribosomal proteins are the linchpins of ribosome biogenesis. In yeast and in animal cells, hundreds of pre-rRNA processing factors have been identified and their involvement in ribosome assembly determined. These studies, together with structural analyses, have yielded comprehensive models of the pre-40S and pre-60S ribosome subunits, as well as of the largest co-transcriptionally assembled pre-ribosome particle: the 90S/SSU-processome...
June 25, 2019: Plant Cell
Rajandeep S Sekhon, Christopher Saski, Rohit Kumar, Barry Flinn, Feng Luo, Timothy M Beissinger, Arlyn J Ackerman, Matthew W Breitzman, William C Bridges, Natalia de Leon, Shawn M Kaeppler
Premature senescence in annual crops reduces yield while delayed senescence, termed stay-green, imposes positive and negative impacts on yield and nutrition quality. Despite its importance, scant information is available on the genetic architecture of senescence in maize (Zea mays L.) and other cereals. We combined a systematic characterization of natural diversity for senescence in maize and co-expression networks derived from transcriptome analysis of normally senescing and stay-green lines. Sixty-four candidate genes were identified by genome-wide association study (GWAS), and fourteen of these are supported by additional evidence for involvement in senescence-related processes including proteolysis, sugar transport and signaling, and sink activity...
June 25, 2019: Plant Cell
Céline Caseys
No abstract text is available yet for this article.
June 25, 2019: Plant Cell
Guanghui Xu, Jingjing Cao, Xufeng Wang, Qiuyue Chen, Weiwei Jin, Zhen Li, Feng Tian
Maize was domesticated from its wild ancestor, teosinte. Maize's new morphology and adaptation to diverse environments require coordinated changes in various metabolic pathways. However, how the metabolome was reshaped since domestication remains poorly understood. Here, we report a comprehensive assessment of divergence in the seedling metabolome between maize and teosinte. A total of 461 metabolites exhibited significant divergence due to selection. Interestingly, teosinte, tropical and temperate maize, representing major stages of maize evolution, targeted distinct sets of metabolites...
June 21, 2019: Plant Cell
Shuo Li, Nan Wang, Dandan Ji, Wenxiao Zhang, Ying Wang, Yanchong Yu, Shizhen Zhao, Menghua Lyu, Juanjuan You, Yangyang Zhang, Luli Wang, Xiaofang Wang, Zhenhua Liu, Jianhua Tong, Langtao Xiao, Ming-Yi Bai, Fengning Xiang
Abscisic acid (ABA) and reactive oxygen species (ROS) act as key signaling molecules in the plant response to salt stress; however, how these signals are transduced and amplified remains unclear. Here, a soybean (Glycine max) salinity-induced NAC transcription factor encoded by SALT INDUCED NAC 1 (GmSIN1) was shown to be a key component of this process. Over-expression of GmSIN1 in soybean promoted root growth, salt tolerance, and increased yield under salt stress; RNA interference-mediated knockdown of GmSIN1 had the opposite effect...
June 21, 2019: Plant Cell
Qiong Zhao, Jinbo Shen, Caiji Gao, Yong Cui, Yongyi Wang, Jie Cui, Lixin Cheng, Wenhan Cao, Ying Zhu, Shuxian Huang, Qianzi Zhou, Cheuk Ka Leong, King Pong Leung, Xuemei Chen, Liwen Jiang
FYVE domain protein required for endosomal sorting 1 (FREE1), a plant specific endosomal sorting complex required for transport I (ESCRT) component, is essential for biogenesis of multivesicular bodies (MVBs), vacuolar degradation of membrane protein, cargo vacuolar sorting, autophagic degradation and vacuole biogenesis in Arabidopsis. Here we report the characterization of RST1 as suppressor of free1, when mutated as null mutant, allows the survival of FREE1-RNAi knockdown line, restores the normal MVB and vacuole formation...
June 20, 2019: Plant Cell
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