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Plant Cell

Sabine Zachgo, Andrea Lauri, Mark Ziemann, Andrea Busch, Mrinal Bhave
No abstract text is available yet for this article.
January 12, 2018: Plant Cell
Mareike L Hohenstatt, Pawel Mikulski, Olga Komarynets, Constanze Klose, Ina Kycia, Albert Jeltsch, Sara Farrona, Daniel Schubert
Polycomb-group (PcG) proteins mediate epigenetic gene regulation by setting H3K27me3 via Polycomb Repressive Complex 2 (PRC2). In plants, it is largely unclear how PcG proteins are recruited to their target genes. Here, we identified the PWWP-DOMAIN INTERACTOR OF POLYCOMBS1 (PWO1) protein, which interacts with all three Arabidopsis thaliana PRC2 histone methyltransferases and is required for maintaining full H3 occupancy at several Arabidopsis genes. PWO1 localizes and recruits CURLY LEAF to nuclear speckles in Nicotiana benthamiana nuclei, suggesting a role in spatial organization of PcG regulation...
January 12, 2018: Plant Cell
Kasper van Gelderen, Chiakai Kang, Richard Paalman, Diederik H Keuskamp, Scott Hayes, Ronald Pierik
Plants in dense vegetation compete for resources and detect competitors through reflection of far-red (FR) light from surrounding plants. This reflection causes a reduced red(R):FR ratio, which is sensed through phytochromes. Low R:FR induces shade avoidance responses of the shoot and also changes the root system architecture, although this has received little attention so far. Here we investigate the molecular mechanisms through which light detection in the shoot regulates root development in Arabidopsis thaliana...
January 9, 2018: Plant Cell
Baohua Li, Michelle Tang, Ayla Nelson, Hart Caligagan, Xue Zhou, Caitlin Clark Wiest, Richard Ngo, Siobhan M Brady, Daniel J Kliebenstein
Plants use diverse mechanisms influenced by vast regulatory networks of indefinite scale to adapt to their environment. These regulatory networks have an unknown potential for epistasis between genes within and across networks. To test for epistasis within an adaptive trait genetic network, we generated and tested 47 Arabidopsis thaliana double mutant combinations for 20 transcription factors, which all influence the accumulation of aliphatic glucosinolates, the defense metabolites that control fitness. The epistatic combinations were used to test if there is more or less epistasis depending on gene membership within the same or different phenotypic sub-networks...
January 9, 2018: Plant Cell
Norbert Bollier, Adrien Sicard, Julie Leblond-Castaing, David Latrasse, Nathalie Gonzalez, Frédéric Gévaudant, Moussa Benhamed, Cécile Raynaud, Michael Lenhard, Christian Chevalier, Michel Hernould, Frédéric Delmas
In angiosperms, the gynoecium is the last structure to develop within the flower due to the determinate fate of floral meristem (FM) stem cells. The maintenance of stem cell activity before its arrest at the stage called FM termination affects the number of carpels that develop. The necessary inhibition at this stage of WUSCHEL (WUS), which is responsible for stem cell maintenance, involves a two-step mechanism. Direct repression mediated by the MADS-domain transcription factor AGAMOUS (AG), followed by indirect repression requiring the C2H2 zinc-finger protein KNUCKLES (KNU), allow for the complete termination of floral stem cell activity...
January 3, 2018: Plant Cell
Fan Zhang, Likai Wang, Eun Esther Ko, Kevin Shao, Hong Qiao
Ethylene plays pleotropic roles in plant growth, plant development, and stress responses. Although the effects of ethylene on plants are well documented, little is known about molecular-level events that result in transcriptional repression during the ethylene response.  In this study, we found that two histone deacetylases, SRT1 and SRT2, interact with ENAP1, which associates with EIN2 in the nucleus. Genetic and transcriptome analyses revealed that SRT1 and SRT2 are required for negative regulation of certain ethylene-responsive genes...
January 3, 2018: Plant Cell
Guanghui Yang, Zhenshan Liu, Lulu Gao, Kuohai Yu, Man Feng, Yingyin Yao, Huiru Peng, Zhaorong Hu, Qixin Sun, Zhongfu Ni, Mingming Xin
Genomic imprinting is an epigenetic phenomenon that causes genes to be differentially expressed depending on their parent-of-origin. To evaluate the evolutionary conservation of genomic imprinting and the effects of ploidy on this process, we investigated parent-of-origin-specific gene expression patterns in the endosperm of diploid (Aegilops spp.), tetraploid, and hexaploid wheat (Triticum spp.) at various stages of development via high-throughput transcriptome sequencing. We identified 91, 135, and 146 maternally or paternally expressed genes (MEGs or PEGs, respectively) in diploid, tetraploid, and hexaploid wheat, respectively, 52...
January 3, 2018: Plant Cell
Jennifer Mach
No abstract text is available yet for this article.
December 20, 2017: Plant Cell
Joshua Udall, R Kelly Dawe
No abstract text is available yet for this article.
December 20, 2017: Plant Cell
Jiani Yang, Shuiyi Thames, Norman B Best, Hui Jiang, Pu Huang, Brian P Dilkes, Andrea L Eveland
Inflorescence architecture is a key determinant of yield potential in many crops and is patterned by the organization and developmental fate of axillary meristems. In cereals, flowers and grain are borne from spikelets, which differentiate in the final iteration of axillary meristem branching. In Setaria spp., inflorescence branches terminate in either a spikelet or a sterile bristle, and these structures appear to be paired. In this work, we leverage Setaria viridis to investigate a role for the phytohormones brassinosteroids (BRs) in specifying bristle identity and maintaining spikelet meristem determinacy...
December 20, 2017: Plant Cell
Lianwei Peng, Jinfang Ma, Wei Chi, Jinkui Guo, Shuyong Zhu, Qingtao Lu, Congming Lu, Li-Xin Zhang
No abstract text is available yet for this article.
December 20, 2017: Plant Cell
Joanne Cannone, Daniel Marino, Alain Jauneau, Cécile Pouzet, Christian Brière, Dominique Roby, Susana Rivas
No abstract text is available yet for this article.
December 18, 2017: Plant Cell
Han Zheng, Fei Zhang, Shiliang Wang, Yanhua Su, Pengfei Jiang, Rihong Cheng, Xiaoru Ji, Suiwen Hou, Yong Ding
Gibberellins (GAs) modulate diverse developmental processes throughout the plant life cycle. However, the interaction between GAs and the circadian rhythm remains unclear. Here, we report that MUT9p-LIKE PROTEIN1 (MLK1) and MLK2 mediate the interaction between GAs and the circadian clock to regulate hypocotyl elongation in Arabidopsis thaliana. DELLA proteins function as master growth repressors that integrate phytohormone signaling and environmental pathways in plant development. MLK1 and MLK2 interact with the DELLA protein REPRESSOR OF ga1-3 (RGA)...
December 18, 2017: Plant Cell
Patrice A Salomé
No abstract text is available yet for this article.
December 14, 2017: Plant Cell
Shugo Maekawa, Tetsuya Ishida, Shuichi Yanagisawa
Ribosome biogenesis is one of the most energy-consuming events in the cell and must therefore be coordinated with changes in cellular energy status. Here, we show that the sugar-inducible gene ARABIDOPSIS PUMILIO PROTEIN 24 (APUM24) encodes a Pumilio homology domain-containing protein involved in pre-ribosomal RNA (pre-rRNA) processing in Arabidopsis thaliana. Null mutation of APUM24 resulted in aborted embryos due to abnormal gametogenesis and embryogenesis, whereas reduced expression of APUM24 caused several phenotypes characteristic of ribosome biogenesis or function-related mutants...
December 14, 2017: Plant Cell
Zhenyu Wang, Xiaojie Tian, Qingzhen Zhao, Zhiqi Liu, Xiufeng Li, Yuekun Ren, Jiaqi Tang, Jun Fang, Qijiang Xu, Qingyun Bu
Cuticular wax plays crucial roles in protecting plants from environmental stresses, particularly drought stress. Many enzyme-encoding genes and transcription factors involved in wax biosynthesis have been identified, but the underlying posttranslational regulatory mechanisms are poorly understood. Here, we demonstrate that DROUGHT HYPERSENSITIVE (DHS), encoding a Really Interesting New Gene (RING)-type protein, is a critical regulator of wax biosynthesis in rice (Oryza sativa). The cuticular wax contents were significantly reduced in DHS overexpression plants but increased in dhs mutants compared to the wild type, which resulted in a response opposite that of drought stress...
December 13, 2017: Plant Cell
Zhenlin Yang, Qi Qiu, Wei Chen, Bei Jia, Xiaomei Chen, Hongmiao Hu, Kaixuan He, Xian Deng, Sisi Li, W Andy Tao, XiaoFeng Cao, Jiamu Du
In chromatin, histone methylation affects the epigenetic regulation of multiple processes in animals and plants and is modulated by the activities of histone methyltransferases and histone demethylases. The jumonji domain-containing histone demethylases have diverse functions and can be classified into several subfamilies. In humans, the jumonji domain-containing Lysine (K)-Specific Demethylase 5/Jumonji and ARID Domain Protein (KDM5/JARID) subfamily demethylases are specific for histone 3 lysine 4 trimethylation (H3K4me3) and are important drug targets for cancer treatment...
December 12, 2017: Plant Cell
Alizée Malnoë, Alex Schultink, Sanya Shahrasbi, Dominique Rumeau, Michel Havaux, Krishna K Niyogi
Light utilization is finely tuned in photosynthetic organisms to prevent cellular damage. The dissipation of excess absorbed light energy, a process termed NPQ, plays an important role in photoprotection. Little is known about the sustained or slowly reversible form(s) of NPQ and whether they are photoprotective, in part due to the lack of mutants. The Arabidopsis thaliana suppressor of quenching1 (soq1) mutant exhibits enhanced sustained NPQ, which we term qH. To identify molecular players involved in qH, we screened for suppressors of soq1 and isolated mutants affecting either chlorophyllide a oxygenase (CAO) or the chloroplastic lipocalin (CHL), now renamed plastid lipocalin (LCNP)...
December 12, 2017: Plant Cell
Kelsey A Maher, Marko Bajic, Kaisa Kajala, Mauricio Reynoso, Germain Pauluzzi, Donnelly West, Kristina Zumstein, Margaret Woodhouse, Kerry L Bubb, Michael W Dorrity, Christine Queitsch, Julia Bailey-Serres, Neelima Sinha, Siobhan M Brady, Roger Deal
The transcriptional regulatory structure of plant genomes remains poorly defined relative to animals. It is unclear how many cis-regulatory elements exist, where these elements lie relative to promoters, and how these features are conserved across plant species. We employed the Assay for Transposase-Accessible Chromatin (ATAC-seq) in four plant species (Arabidopsis thaliana, Medicago truncatula, Solanum lycopersicum, and Oryza sativa) to delineate open chromatin regions and transcription factor (TF) binding sites across each genome...
December 11, 2017: Plant Cell
Patrice A Salomé
No abstract text is available yet for this article.
December 6, 2017: Plant Cell
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