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[PMID]: 29440300
[Au] Autor:Otani K; Ishizaki K; Nishihama R; Takatani S; Kohchi T; Takahashi T; Motose H
[Ad] Address:Department of Biological Science, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan.
[Ti] Title:An evolutionarily conserved NIMA-related kinase directs rhizoid tip growth in the basal land plant .
[So] Source:Development;145(5), 2018 Mar 01.
[Is] ISSN:1477-9129
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Tip growth is driven by turgor pressure and mediated by the polarized accumulation of cellular materials. How a single polarized growth site is established and maintained is unclear. Here, we analyzed the function of NIMA-related protein kinase 1 (MpNEK1) in the liverwort In the wild type, rhizoid cells differentiate from the ventral epidermis and elongate through tip growth to form hair-like protrusions. In Mp knockout mutants, rhizoids underwent frequent changes in growth direction, resulting in a twisted and/or spiral morphology. The functional MpNEK1-Citrine protein fusion localized to microtubule foci in the apical growing region of rhizoids. Mp knockouts exhibited increases in both microtubule density and bundling in the apical dome of rhizoids. Treatment with the microtubule-stabilizing drug taxol phenocopied the Mp knockout. These results suggest that MpNEK1 directs tip growth in rhizoids through microtubule organization. Furthermore, MpNEK1 expression rescued ectopic outgrowth of epidermal cells in the mutant, strongly supporting an evolutionarily conserved NEK-dependent mechanism of directional growth. It is possible that such a mechanism contributed to the evolution of the early rooting system in land plants.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180302
[Lr] Last revision date:180302
[St] Status:In-Data-Review

  2 / 429 MEDLINE  
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[PMID]: 29243209
[Au] Autor:Ares Á; Itouga M; Kato Y; Sakakibara H
[Ad] Address:Plant Productivity Systems Research Group, Center for Sustainable Resource Science, Yokohama, Japan. aa.pita@gmail.com.
[Ti] Title:Differential Metal Tolerance and Accumulation Patterns of Cd, Cu, Pb and Zn in the Liverwort Marchantia polymorpha L.
[So] Source:Bull Environ Contam Toxicol;100(3):444-450, 2018 Mar.
[Is] ISSN:1432-0800
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:In this study, we investigated the bioaccumulation, tissue distribution and physiological responses to different metal concentration (0.2 and 2 mM) and time of exposure of 1, 2 and 3 weeks with cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn) using the model liverwort Marchantia polymorpha. Our data showed, on one hand, a significant enrichment and tissue translocation of Cu, Zn, and specially Cd, reaching concentrations of 1800 µg g in 3 weeks. On the other hand, Pb exhibited the lowest concentration values (50 µg g ), and 90% of the total concentration in the rhizoids. We could observe a positive correlation between tissue concentration, metal translocation and an enhanced toxic response. The results obtained in this study might contribute not only in the application of this species in environmental studies with heavy metals but also as a starting point to study the evolution of metal tolerance in land plants.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1712
[Cu] Class update date: 180221
[Lr] Last revision date:180221
[St] Status:In-Process
[do] DOI:10.1007/s00128-017-2241-0

  3 / 429 MEDLINE  
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[PMID]: 29444306
[Au] Autor:Guo H; Wang N; McDonald TR; Reinders A; Ward JM
[Ad] Address:Department of Plant and Microbial Biology, University of Minnesota, USA.
[Ti] Title:MpAMT1;2 From Marchantia polymorpha Is A High-Affinity, Plasma Membrane Ammonium Transporter.
[So] Source:Plant Cell Physiol;, 2018 Feb 12.
[Is] ISSN:1471-9053
[Cp] Country of publication:Japan
[La] Language:eng
[Ab] Abstract:Plant ammonium transporters in the AMT/MEP/Rh superfamily have only been previously characterized in flowering plants (angiosperms). Plant AMT1s are electrogenic, while plant AMT2s are electroneutral and MEP and Rh transporters in other organisms are electroneutral. We analyzed the transport function of MpAMT1;2 from the basal land plant Marchantia polymorpha, a liverwort. MpAMT1;2 was shown to localize to the plasma membrane in Marchantia gametophyte thallus by stable transformation using a C-terminal citrine fusion. MpAMT1;2 expression was studied using qRT-PCR and shown to be higher when plants were N deficient and lower when plants were grown on media containing ammonium, nitrate, or the amino acid glutamine. Expression in Xenopus oocytes and analysis by electrophysiology revealed that MpAMT1;2 is an electrogenic ammonium transporter with a very high affinity for ammonium (7 µM at pH 5.6 and a membrane potential of -137 mV). A conserved inhibitory phosphorylation site identified in angiosperm AMT1s is also present in all AMT1s in Marchantia. Here we show that a phosphomimetic mutation T475D in MpAMT1;2 completely inhibits ammonium transport activity. The results indicate that MpAMT1;2 may be important for ammonium uptake into cells in the Marchantia thallus.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180214
[Lr] Last revision date:180214
[St] Status:Publisher
[do] DOI:10.1093/pcp/pcy038

  4 / 429 MEDLINE  
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[PMID]: 29444302
[Au] Autor:Minamino N; Kanazawa T; Era A; Ebine K; Nakano A; Ueda T
[Ad] Address:Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 Japan.
[Ti] Title:RAB GTPases in the basal land plant Marchantia polymorpha.
[So] Source:Plant Cell Physiol;, 2018 Feb 10.
[Is] ISSN:1471-9053
[Cp] Country of publication:Japan
[La] Language:eng
[Ab] Abstract:The RAB GTPase is an evolutionarily conserved machinery component of membrane trafficking, which is the fundamental system for cell viability and higher-order biological functions. The composition of RAB GTPases in each organism is closely related to the complexity and organization of the membrane-trafficking pathway, which has been developed uniquely to realize the organism-specific membrane trafficking system. Comparative genomics has suggested that terrestrialization and/or multicellularization were associated with the expansion of membrane trafficking pathways in green plants, which has yet to be validated in basal land plant lineages. To obtain insight into the diversification of membrane trafficking systems in green plants, we analyzed RAB GTPases encoded in the genome of the liverwort Marchantia polymorpha in a comprehensive manner. We isolated all genes for RAB GTPases in Marchantia and analyzed their expression patterns and subcellular localizations in thallus cells. While a majority of MpRAB GTPases exhibited a ubiquitous expression pattern, specific exceptions were also observed; MpRAB2b, which contains a sequence similar to an intraflagellar transport protein at the carboxyl-terminal region, and MpRAB23, which has been secondarily lost in angiosperms, were specifically expressed in the male reproductive organ. MpRAB21, which is another RAB GTPase whose homolog is absent in Arabidopsis, exhibited endosomal localization with RAB5 members in Marchantia. These results suggest that Marchantia possesses unique membrane trafficking pathways involving a unique repertoire of RAB GTPases.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180214
[Lr] Last revision date:180214
[St] Status:Publisher
[do] DOI:10.1093/pcp/pcy027

  5 / 429 MEDLINE  
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[PMID]: 29428820
[Au] Autor:Yu HN; Liu XY; Gao S; Sun B; Zheng HB; Ji M; Cheng AX; Lou HX
[Ad] Address:Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China.
[Ti] Title:Structural and biochemical characterization of the plant type III polyketide synthases of the liverwort Marchantia paleacea.
[So] Source:Plant Physiol Biochem;125:95-105, 2018 Jan 31.
[Is] ISSN:1873-2690
[Cp] Country of publication:France
[La] Language:eng
[Ab] Abstract:Chalcone synthases (CHSs) of the type III polyketide synthases (PKSs), catalyze the formation of a tetraketide intermediate from a CoA-tethered starter and malonyl-CoA but use different cyclization mechanisms to produce distinct chemical scaffolds. Herein, we characterized CHS and CHS-like enzymes (designated MpCHS and MpCHSL1, 2 and 3) from Marchantia paleacea and determined the crystal structure of MpCHSL1. MpCHS catalyzed a Claisen condensation to form chalcone, while MpCHSLs catalyzed the formation of lactonized α-pyrones in vitro. Based on the structural, mutational and in vitro biochemical analyses, we established that MpCHSL1 is structurally and functionally closer to prototype CHS than stilbene synthase, and characterized the structural basis for the functional diversity of the type III PKSs. A chalcone-forming mutant of MpCHSL1 was build directed by the structural information. These findings pave the way for future studies to elucidate the functional diversity of type III PKSs in liverwort.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180211
[Lr] Last revision date:180211
[St] Status:Publisher

  6 / 429 MEDLINE  
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[PMID]: 29368664
[Au] Autor:Schmid MW; Giraldo-Fonseca A; Rövekamp M; Smetanin D; Bowman JL; Grossniklaus U
[Ad] Address:Department of Plant and Microbial Biology and Zurich-Basel Plant Science Center, University of Zurich, Zurich, Switzerland.
[Ti] Title:Extensive epigenetic reprogramming during the life cycle of Marchantia polymorpha.
[So] Source:Genome Biol;19(1):9, 2018 01 25.
[Is] ISSN:1474-760X
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:BACKGROUND: In plants, the existence and possible role of epigenetic reprogramming has been questioned because of the occurrence of stably inherited epialleles. Evidence suggests that epigenetic reprogramming does occur during land plant reproduction, but there is little consensus on the generality and extent of epigenetic reprogramming in plants. We studied DNA methylation dynamics during the life cycle of the liverwort Marchantia polymorpha. We isolated thalli and meristems from male and female gametophytes, archegonia, antherozoids, as well as sporophytes at early and late developmental stages, and compared their DNA methylation profiles. RESULTS: Of all cytosines tested for differential DNA methylation, 42% vary significantly in their methylation pattern throughout the life cycle. However, the differences are limited to few comparisons between specific stages of the life cycle and suggest four major epigenetic states specific to sporophytes, vegetative gametophytes, antherozoids, and archegonia. Further analyses indicated clear differences in the mechanisms underlying reprogramming in the gametophytic and sporophytic generations, which are paralleled by differences in the expression of genes involved in DNA methylation. Differentially methylated cytosines with a gain in methylation in antherozoids and archegonia are enriched in the CG and CHG contexts, as well as in gene bodies and gene flanking regions. In contrast, gain of DNA methylation during sporophyte development is mostly limited to the CHH context, LTR retrotransposons, DNA transposons, and repeats. CONCLUSION: We conclude that epigenetic reprogramming occurs at least twice during the life cycle of M. polymorpha and that the underlying mechanisms are likely different between the two events.
[Pt] Publication type:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Entry month:1801
[Cu] Class update date: 180208
[Lr] Last revision date:180208
[St] Status:In-Process
[do] DOI:10.1186/s13059-017-1383-z

  7 / 429 MEDLINE  
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[PMID]: 29411387
[Au] Autor:Nelson JM; Hauser DA; Hinson R; Shaw AJ
[Ad] Address:Duke University Department of Biology, Durham, NC, 27708, USA.
[Ti] Title:A novel experimental system using the liverwort Marchantia polymorpha and its fungal endophytes reveals diverse and context-dependent effects.
[So] Source:New Phytol;, 2018 Feb 07.
[Is] ISSN:1469-8137
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Fungal symbioses are ubiquitous in plants, but their effects have mostly been studied in seed plants. This study aimed to assess the diversity of fungal endophyte effects in a bryophyte and identify factors contributing to the variability of outcomes in these interactions. Fungal endophyte cultures and axenic liverwort clones were isolated from wild populations of the liverwort, Marchantia polymorpha. These collections were combined in a gnotobiotic system to test the effects of fungal isolates on the growth rates of hosts under laboratory conditions. Under the experimental conditions, fungi isolated from M. polymorpha ranged from aggressively pathogenic to strongly growth-promoting, but the majority of isolates caused no detectable change in host growth. Growth promotion by selected fungi depended on nutrient concentrations and was inhibited by coinoculation with multiple fungi. The M. polymorpha endophyte system expands the resources for this model liverwort. The experiments presented here demonstrate a wealth of diversity in fungal interactions even in a host reported to lack standard mycorrhizal symbiosis. In addition, they show that some known pathogens of vascular plants live in M. polymorpha and can confer benefits to this nonvascular host. This highlights the importance of studying endophyte effects across the plant tree of life.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180207
[Lr] Last revision date:180207
[St] Status:Publisher
[do] DOI:10.1111/nph.15012

  8 / 429 MEDLINE  
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[PMID]: 29395928
[Au] Autor:Yamaoka S; Nishihama R; Yoshitake Y; Ishida S; Inoue K; Saito M; Okahashi K; Bao H; Nishida H; Yamaguchi K; Shigenobu S; Ishizaki K; Yamato KT; Kohchi T
[Ad] Address:Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan.
[Ti] Title:Generative Cell Specification Requires Transcription Factors Evolutionarily Conserved in Land Plants.
[So] Source:Curr Biol;28(3):479-486.e5, 2018 Feb 05.
[Is] ISSN:1879-0445
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Land plants differentiate germ cells in the haploid gametophyte. In flowering plants, a generative cell is specified as a precursor that subsequently divides into two sperm cells in the developing male gametophyte, pollen. Generative cell specification requires cell-cycle control and microtubule-dependent nuclear relocation (reviewed in [1-3]). However, the generative cell fate determinant and its evolutionary origin are still unknown. In bryophytes, gametophytes produce eggs and sperm in multicellular reproductive organs called archegonia and antheridia, respectively, or collectively called gametangia. Given the monophyletic origin of land plants [4-6], evolutionarily conserved mechanisms may play key roles in these diverse reproductive processes. Here, we showed that a single member of the subfamily VIIIa of basic helix-loop-helix (bHLH) transcription factors in the liverwort Marchantia polymorpha primarily accumulated in the initial cells and controlled their development into gametangia. We then demonstrated that an Arabidopsis thaliana VIIIa bHLH transiently accumulated in the smaller daughter cell after an asymmetric division of the meiosis-derived microspore and was required for generative cell specification redundantly with its paralog. Furthermore, these A. thaliana VIIIa bHLHs were functionally replaceable by the M. polymorpha VIIIa bHLH. These findings suggest the VIIIa bHLH proteins as core regulators for reproductive development, including germ cell differentiation, since an early stage of land plant evolution.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180206
[Lr] Last revision date:180206
[St] Status:In-Data-Review

  9 / 429 MEDLINE  
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[PMID]: 29363139
[Au] Autor:Albert NW; Thrimawithana AH; McGhie TK; Clayton WA; Deroles SC; Schwinn KE; Bowman JL; Jordan BR; Davies KM
[Ad] Address:The New Zealand Institute for Plant & Food Research Limited, Private Bag 11600, Palmerston North, New Zealand.
[Ti] Title:Genetic analysis of the liverwort Marchantia polymorpha reveals that R2R3MYB activation of flavonoid production in response to abiotic stress is an ancient character in land plants.
[So] Source:New Phytol;, 2018 Jan 24.
[Is] ISSN:1469-8137
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:The flavonoid pathway is hypothesized to have evolved during land colonization by plants c. 450 Myr ago for protection against abiotic stresses. In angiosperms, R2R3MYB transcription factors are key for environmental regulation of flavonoid production. However, angiosperm R2R3MYB gene families are larger than those of basal plants, and it is not known whether the regulatory system is conserved across land plants. We examined whether R2R3MYBs regulate the flavonoid pathway in liverworts, one of the earliest diverging land plant lineages. We characterized MpMyb14 from the liverwort Marchantia polymorpha using genetic mutagenesis, transgenic overexpression, gene promoter analysis, and transcriptomic and chemical analysis. MpMyb14 is phylogenetically basal to characterized angiosperm R2R3MYB flavonoid regulators. Mpmyb14 knockout lines lost all red pigmentation from the flavonoid riccionidin A, whereas overexpression conferred production of large amounts of flavones and riccionidin A, activation of associated biosynthetic genes, and constitutive red pigmentation. MpMyb14 expression and flavonoid pigmentation were induced by light- and nutrient-deprivation stress in M. polymorpha as for anthocyanins in angiosperms. MpMyb14 regulates stress-induced flavonoid production in M. polymorpha, and is essential for red pigmentation. This suggests that R2R3MYB regulated flavonoid production is a conserved character across land plants which arose early during land colonization.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1801
[Cu] Class update date: 180124
[Lr] Last revision date:180124
[St] Status:Publisher
[do] DOI:10.1111/nph.15002

  10 / 429 MEDLINE  
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[PMID]: 27770366
[Au] Autor:Tsuzuki M; Watanabe Y
[Ad] Address:Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo, 153-8902, Japan.
[Ti] Title:Profiling New Small RNA Sequences.
[So] Source:Methods Mol Biol;1456:177-188, 2017.
[Is] ISSN:1940-6029
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Small RNAs are key molecules in RNA silencing pathways that exert the sequence-specific regulation of gene expression and chromatin modifications in many eukaryotes. In plants, endogenous small RNAs, including microRNAs (miRNAs), trans-acting short interfering RNAs (tasiRNAs), and heterochromatic siRNAs (hc-siRNAs), play an important role in switching or orchestrating biological processes during the development and at the onset of stress responses. These endogenous and exogenous small RNAs are mainly 20-24 nucleotides in length. In addition, viral genome-derived siRNAs of similar lengths are produced during viral infection, and they exhibit anti-viral defense activity in RNA silencing pathway.Here, we introduce a method to isolate and characterize small RNA molecules possibly applicable to a wide range of plant resources and tissues. After purification from total RNAs, small RNAs were subjected to Illumina sequencing analysis using compatible reagents kits. Following the sample preparation protocol, small RNAs are ligated first at the 3'- and then at the 5'-end to the respective RNA adapters followed by reverse transcription with a set of primers to produce cDNAs with Index sequences at ends. After PCR amplification, cDNAs are subjected (after gel purification) to RNA-seq analysis. This method could be applied to isolate small RNAs from different sources and characterize small RNA profiles to compare different sets of samples, e.g., wild-type and mutant plants, plants under different stress environments, and virus-infected plants because the starting RNA material is free of contaminated starch or similar material which would block further analysis.
[Mh] MeSH terms primary: Gene Expression Profiling
RNA, Small Untranslated/genetics
Transcriptome
[Mh] MeSH terms secundary: Arabidopsis/genetics
Computational Biology/methods
High-Throughput Nucleotide Sequencing
Marchantia/genetics
MicroRNAs/genetics
RNA, Plant
RNA, Small Interfering/genetics
RNA, Small Untranslated/isolation & purification
RNA, Viral/genetics
Reverse Transcriptase Polymerase Chain Reaction
Software
Web Browser
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (MicroRNAs); 0 (RNA, Plant); 0 (RNA, Small Interfering); 0 (RNA, Small Untranslated); 0 (RNA, Viral)
[Em] Entry month:1801
[Cu] Class update date: 180112
[Lr] Last revision date:180112
[Js] Journal subset:IM
[Da] Date of entry for processing:161023
[St] Status:MEDLINE


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