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Plant Cell

Nancy Rosenbaum Hofmann
No abstract text is available yet for this article.
March 20, 2017: Plant Cell
Talia Karasov, Eunyoung Chae, Jacob Herman, Joy Bergelson
Plants have evolved an array of defenses against pathogens. However, mounting a defense response frequently comes with the cost of a reduction in growth and reproduction, carrying critical implications for natural and agricultural populations. How costs are generated, and whether and how they can be mitigated is the focus of this review. Most well-characterized growth-defense tradeoffs stem from antagonistic crosstalk among hormones rather than an identified metabolic expenditure. A primary way plants mitigate such costs is through restricted expression of resistance; this can be achieved through inducible expression of defense genes or by the concentration of defense to particular times or tissues...
March 20, 2017: Plant Cell
Zhiyang Zhai, Hui Liu, John Shanklin
WRINKLED1 (WRI1), a member of the APETALA2 (AP2) class of transcription factors, positively regulates glycolysis and lipid biosynthesis in Arabidopsis thaliana. Here we identify mechanistic links between KIN10, the major SUCROSE NON-FERMENTATION-1 (SNF1)-RELATED KINASE 1 (SnRK1) involved in sugar/energy homeostasis and the posttranslational regulation of WRI1. Transient expression of WRI1 with OLEOSIN1 (OLE1) in Nicotiana benthamiana stimulates triacylglycerol (TAG) accumulation, but their coexpression with KIN10 abrogates this effect by inducing proteasomal degradation of WRI1...
March 17, 2017: Plant Cell
Michael Alan Schon, Michael Nodine
No abstract text is available yet for this article.
March 17, 2017: Plant Cell
Jason A Corwin, Daniel J Kliebenstein
Molecular plant pathology has focused on studying large-effect qualitative resistance loci that predominantly function in detecting pathogens and/or transmitting signals resulting from pathogen detection. By contrast, less is known about quantitative resistance loci, particularly the molecular mechanisms controlling variation in quantitative resistance. Recent studies have provided insight into these mechanisms, showing that genetic variation at hundreds of causal genes may underpin quantitative resistance...
March 16, 2017: Plant Cell
Jian-Min Zhou, Dingzhong Tang, Guoxun Wang
Receptor-Like Kinases (RLKs) and Receptor-Like Proteins (RLPs) play crucial roles in plant immunity, growth and development. Plants deploy a large number of RLKs and RLPs as Pattern Recognition Receptors (PRRs) to detect microbe- and host-derived molecular patterns, as the first line of defense. Recent advances have uncovered new PRRs, their corresponding ligands, and mechanisms underlying PRR activation and signaling. In general, PRRs associate with other RLKs and function as part of multi-protein immune complexes at the cell surface...
March 16, 2017: Plant Cell
Jing Wang, Hong Yu, Guosheng Xiong, Zefu Lu, Yongqing Jiao, Xiangbing Meng, Guifu Liu, Xuewei Chen, Yonghong Wang, Jiayang Li
Plant architecture, a collection of genetically controlled agronomic traits, is one of the decisive factors that determine grain production. IDEAL PLANT ARCHITECTURE 1 (IPA1) encodes a key transcription factor having pleiotropic effects on regulating plant architecture in rice (Oryza sativa), and IPA1 expression is controlled at the post-transcriptional level by microRNA156 and microRNA529. Here, we report the identification and characterization of IPA1 INTERACTING PROTEIN 1 (IPI1), a RING-finger E3 ligase that can interact with IPA1 in the nucleus...
March 14, 2017: Plant Cell
Lei Xu, Hongyu Zhao, Wenyuan Ruan, Minjuan Deng, Fang Wang, Jinrong Peng, Jie Luo, Zhixiang Chen, Keke Yi
Root meristem activity determines root growth and root architecture and consequently affects water and nutrient uptake in plants. However, our knowledge about the regulation of root meristem activity in crop plants is very limited. Here, we report the isolation and characterization of a short root mutant in rice (Oryza sativa) with reduced root meristem activity. This root growth defect is caused by a mutation in ABNORMAL INFLUORESCENCE MERISTEM1 (AIM1), which encodes a 3-hydroxyacyl-CoA dehydrogenase, an enzyme involved in β-oxidation...
March 14, 2017: Plant Cell
Amy Midori James, Achala S Jayasena, Jingjing Zhang, Oliver Berkowitz, David Secco, Gavin J Knott, James Whelan, Charles Bond, Joshua S Mylne
Bowman-Birk Inhibitors (BBIs) are a well-known family of plant protease inhibitors first described 70 years ago. BBIs are known only in the legume (Fabaceae) and cereal (Poaceae) families, but peptides that mimic their trypsin inhibitory loops exist in sunflowers and frogs. The disparate biosynthetic origins and distant phylogenetic distribution implies these loops evolved independently, but their structural similarity suggests a common ancestor. Targeted bioinformatic searches for the BBI inhibitory loop discovered highly divergent BBI like sequences in the seedless, vascular spikemoss Selaginella moellendorffii...
March 14, 2017: Plant Cell
Giulia Furlan, Hirofumi Nakagami, Lennart Eschen-Lippold, Xiyuan Jiang, Petra Majovsky, Kathrin Kowarschik, Wolfgang Hoehenwarter, Justin Lee, Marco Trujillo
Crosstalk between post-translational modifications such as ubiquitination and phosphorylation play key roles in controlling the duration and intensity of signalling events to ensure cellular homeostasis. However, the molecular mechanisms underlying the regulation of negative feedback loops remain poorly understood. Here we uncover a pathway in Arabidopsis thaliana by which a negative feedback loop involving the E3 ubiquitin ligase PUB22 that dampens the immune response is triggered by MITOGEN-ACTIVATED PROTEIN KINASE3 (MPK3), best known for its function in the activation of signalling...
March 9, 2017: Plant Cell
Weronika Sura, Michał Kabza, Wojciech M Karlowski, Tomasz Bieluszewski, Marta Kuś-Slowinska, Łukasz Pawełoszek, Jan Sadowski, Piotr A Ziolkowski
The influence of the histone variant H2A.Z on transcription remains a long-standing conundrum. Here, by analyzing the actin-related protein6 mutant, which is impaired in H2A.Z deposition, and by H2A.Z profiling in stress conditions, we investigated the impact of this histone variant on gene expression in Arabidopsis thaliana. We demonstrate that the arp6 mutant exhibits anomalies in response to osmotic stress. Indeed, stress-responsive genes are overrepresented amongst those hyperactive in arp6. In wild-type plants, these genes exhibit high levels of H2A...
March 3, 2017: Plant Cell
Shiyong Song, Ying Chen, Lu Liu, Yanwen Wang, Shengjie Bao, Xuan Zhou, Zhi Wei Norman Teo, Chuanzao Mao, Yinbo Gan, Hao Yu
Flowering time is a critical agronomic trait that determines successful seed production and adaptation of crop plants. Photoperiodic control of this process in flowering plants is mediated by the long-distance mobile signal called florigen partly encoded by FLOWERING LOCUS T (FT) in Arabidopsis and its orthologs in other plant species. Despite the progress in understanding FT transport in the dicot model Arabidopsis, the mechanisms of florigen transport in monocots, which provide most of the biomass in agriculture, are unknown...
March 2, 2017: Plant Cell
Dominique Arnaud, Seungchul Lee, Yumiko Takebayashi, Daeseok Choi, Jaemyung Choi, Hitoshi Sakakibara, Ildoo Hwang
Stomata play an important role in pre-invasive defense responses by limiting pathogen entry into leaves. Although the stress hormones salicylic acid (SA) and abscisic acid (ABA) are known to regulate stomatal immunity, the role of growth promoting hormones is far from understood. Here, we show that in Arabidopsis, cytokinins (CKs) function in stomatal defense responses. The cytokinin receptor HISTIDINE KINASE3 (AHK3) and the RESPONSE REGULATOR2 (ARR2) promote stomatal closure triggered by pathogen-associated molecular pattern (PAMP) and resistance to Pseudomonas syringae pv tomato bacteria...
March 2, 2017: Plant Cell
Jianbin Su, Mengmeng Zhang, Lawrence Zhang, Tiefeng Sun, Yidong Liu, Wolfgang Lukowitz, Juan Xu, Shuqun Zhang
Activation of mitogen-activated protein kinases (MAPKs) is one of the earliest responses after plants sense an invading pathogen. Here we show that MPK3 and MPK6, two Arabidopsis thaliana pathogen-responsive MAPKs, and their upstream MAPK Kinases, MKK4 and MKK5, are essential to both stomatal and apoplastic immunity. Loss of function of MPK3 and MPK6, or their upstream MKK4 and MKK5, abolishes pathogen/microbe-associated molecular pattern- and pathogen-induced stomatal closure. Gain-of-function activation of MPK3/MPK6 induces stomatal closure independently of abscisic acid (ABA) biosynthesis and signaling...
March 2, 2017: Plant Cell
Marisa Rosa, Maria Jazmin Abraham-Juarez, Michael W Lewis, João Pedro Fonseca, Wang Tian, Vicente Ramirez, Sheng Luan, Markus Pauly, Sarah Hake
Organogenesis occurs through cell division, expansion, and differentiation. How these cellular processes are coordinated remains elusive. The maize (Zea mays) leaf provides a robust system to study cellular differentiation due to its distinct tissues and cell types. The narrow odd dwarf (nod) mutant displays defects at both the cellular and tissue level that increase in severity throughout growth. nod mutant leaves have reduced size due to fewer and smaller cells compared to wild type. The juvenile-to-adult transition is delayed and proximal distal-patterning is abnormal in this mutant...
March 2, 2017: Plant Cell
Karl J Oparka, Attila Molnar
No abstract text is available yet for this article.
February 24, 2017: Plant Cell
Alexander Schulz
No abstract text is available yet for this article.
February 24, 2017: Plant Cell
Susana Rivas, Tina Romeis, Jonathan D Jones
No abstract text is available yet for this article.
February 23, 2017: Plant Cell
Kirsten Hendrika Ten Tusscher, Marta Laskowski
Conditioning small groups of root pericycle cells for future lateral root formation has a major impact on overall plant root architecture. This priming of lateral roots occurs rhythmically, involving temporal oscillations in auxin response in the root tip. During growth, this process generates a spatial pattern of prebranch sites, an early stage in lateral root formation characterized by a stably maintained high auxin response. Thusfar, the molecular mechanism behind this rhythmicity has remained elusive. Some data implicate a cell-autonomous oscillation in gene expression, while others strongly support the importance of tissue-level modulations in auxin fluxes...
February 21, 2017: Plant Cell
Alfonso Muñoz, Silvina Mangano, Mary Paz González-García, Ramón Contreras, Michael B Sauer, Bert De Rybel, Dolf Weijers, José J Sánchez-Serrano, Maite Sanmartín, Enrique Rojo
The transcriptional regulator MINIYO (IYO) is essential and rate-limiting for initiating cell differentiation in Arabidopsis thaliana. Moreover, IYO moves from the cytosol into the nucleus in cells at the meristem periphery, possibly triggering their differentiation. However, the genetic mechanisms controlling IYO nuclear accumulation were unknown and the evidence that increased nuclear IYO levels trigger differentiation remained correlative. Searching for IYO interactors, we have identified RPAP2 IYO Mate (RIMA), a homologue of yeast and human proteins linked to nuclear import of selective cargo...
February 21, 2017: Plant Cell
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