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https://www.readbyqxmd.com/read/28334099/sex-differences-and-plasticity-in-dehydration-tolerance-insight-from-a-tropical-liverwort
#1
Rose A Marks, James F Burton, D Nicholas McLetchie
No abstract text is available yet for this article.
November 10, 2016: Annals of Botany
https://www.readbyqxmd.com/read/28295410/diversity-of-strategies-for-escaping-reactive-oxygen-species-production-within-photosystem-i-among-land-plants-p700-oxidation-system-is-prerequisite-for-alleviating-photoinhibition-in-photosystem-i
#2
Daisuke Takagi, Kimitsune Ishizaki, Hitomi Hanawa, Tomohito Mabuchi, Ginga Shimakawa, Hiroshi Yamamoto, Chikahiro Miyake
In land plants, photosystem (PS) I photoinhibition limits carbon fixation and causes growth defects. In addition, recovery from PSI photoinhibition takes much longer than PSII photoinhibition when the PSI core-complex is degraded by oxidative damage. Accordingly, PSI photoinhibition should be avoided in land plants, and land plants should have evolved mechanisms to prevent PSI photoinhibition. However, such protection mechanisms have not yet been identified, and it remains unclear whether all land plants suffer from PSI photoinhibition in the same way...
March 10, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28263997/total-flavonoid-concentrations-of-bryophytes-from-tianmu-mountain-zhejiang-province-china-phylogeny-and-ecological-factors
#3
Xin Wang, Jianguo Cao, Xiling Dai, Jianbo Xiao, Yuhuan Wu, Quanxi Wang
The flavonoids in bryophytes may have great significance in phylogeny and metabolism research. However, to date there has been little research on bryophyte metabolites, especially flavonoids. To redress this somewhat, we determined flavonoid concentrations of bryophytes from Tianmu Mountain through a colorimetric assay and considered the factors influencing the results. This is the first time that the flavonoid contents of bryophytes have been examined in detail. The results revealed a range of total flavonoid concentrations in 90 samples collected from Tianmu Mountain from 1...
2017: PloS One
https://www.readbyqxmd.com/read/28244104/early-evolution-of-the-land-plant-circadian-clock
#4
Anna-Malin Linde, D Magnus Eklund, Akane Kubota, Eric R A Pederson, Karl Holm, Niclas Gyllenstrand, Ryuichi Nishihama, Nils Cronberg, Tomoaki Muranaka, Tokitaka Oyama, Takayuki Kohchi, Ulf Lagercrantz
While angiosperm clocks can be described as an intricate network of interlocked transcriptional feedback loops, clocks of green algae have been modelled as a loop of only two genes. To investigate the transition from a simple clock in algae to a complex one in angiosperms, we performed an inventory of circadian clock genes in bryophytes and charophytes. Additionally, we performed functional characterization of putative core clock genes in the liverwort Marchantia polymorpha and the hornwort Anthoceros agrestis...
February 28, 2017: New Phytologist
https://www.readbyqxmd.com/read/28223991/the-comparison-of-expressed-candidate-secreted-proteins-from-two-arbuscular-mycorrhizal-fungi-unravels-common-and-specific-molecular-tools-to-invade-different-host-plants
#5
Laurent Kamel, Nianwu Tang, Mathilde Malbreil, Hélène San Clemente, Morgane Le Marquer, Christophe Roux, Nicolas Frei Dit Frey
Arbuscular mycorrhizal fungi (AMF), belonging to the fungal phylum Glomeromycota, form mutualistic symbioses with roots of almost 80% of land plants. The release of genomic data from the ubiquitous AMF Rhizophagus irregularis revealed that this species possesses a large set of putative secreted proteins (RiSPs) that could be of major importance for establishing the symbiosis. In the present study, we aimed to identify SPs involved in the establishment of AM symbiosis based on comparative gene expression analyses...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28219451/quantitative-morphological-analysis-of-2d-images-of-complex-shaped-branching-biological-growth-forms-the-example-of-branching-thalli-of-liverworts
#6
Pirom Konglerd, Catherine Reeb, Fredrik Jansson, Jaap A Kaandorp
BACKGROUND: Many organisms such as plants can be characterized as complex-shaped branching forms. The morphological quantification of the forms is a support for a number of areas such as the effects of environmental factors and species discrimination. To date, there is no software package suitable for our dataset representing the forms. We therefore formulate methods for extracting morphological measurements from images of the forms. RESULTS: As a case study we analyze two-dimensional images of samples from four groups belonging to three species of thalloid liverworts, genus Riccardia...
February 20, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28197715/vacuolar-ion-channels-in-the-liverwort-marchantia-polymorpha-influence-of-ion-channel-inhibitors
#7
Mateusz Koselski, Kazimierz Trebacz, Halina Dziubinska
Potassium-permeable slow activating vacuolar channels (SV) and chloride-permeable channels in the vacuole of the liverwort Marchantia polymorpha were characterized in respect to calcium dependence, selectivity, and pharmacology. The patch-clamp method was used in the study of ion channel activity in the vacuoles from the liverwort Marchantia polymorpha. The whole-vacuole recordings allowed simultaneous observation of two types of currents-predominant slow activated currents recorded at positive voltages and fast activated currents recorded at negative voltages...
February 14, 2017: Planta
https://www.readbyqxmd.com/read/28174248/mpwip-regulates-air-pore-complex-development-in-the-liverwort-marchantia-polymorpha
#8
Victor A S Jones, Liam Dolan
The colonisation of the land by plants was accompanied by the evolution of complex tissues and multicellular structures comprising different cell types as morphological adaptations to the terrestrial environment. Here we show that the single WIP protein in the early-diverging land plant Marchantia polymorpha L. is required for the development of the multicellular gas exchange structure, the air pore complex. This 16-cell barrel-shaped structure surrounds an opening between epidermal cells that facilitates the exchange of gasses between the chamber containing the photosynthetic cells inside the plant and the air outside...
February 7, 2017: Development
https://www.readbyqxmd.com/read/28162041/n-hexanal-and-z-3-hexenal-are-generated-from-arachidonic-acid-and-linolenic-acid-by-a-lipoxygenase-in-marchantia-polymorpha-l
#9
Moataz M Tawfik, Katsuyuki T Yamato, Takayuki Kohchi, Takao Koeduka, Kenji Matsui
Most terrestrial plants form green leaf volatiles (GLVs), which are mainly composed of six-carbon (C6) compounds. In our effort to study the distribution of the ability of lipoxygenase (LOX) to form GLVs, we found that a liverwort, Marchantia polymorpha, formed n-hexanal and (Z)-3-hexenal. Some LOXs execute a secondary reaction to form short chain volatiles. One of the LOXs from M. polymorpha (MpLOX7) oxygenized arachidonic and α-linolenic acids at almost equivalent efficiency and formed C6-aldehydes during its catalysis; these are likely formed from hydroperoxides of arachidonic and α-linolenic acids, with a cleavage of the bond between carbon at the base of the hydroperoxy group and carbon of double bond, which is energetically unfavorable...
February 6, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28160212/phthalides-distribution-in-nature-chemical-reactivity-synthesis-and-biological-activity
#10
Alejandra León, Mayela Del-Ángel, José Luis Ávila, Guillermo Delgado
Phthalides are a relatively small group of natural compounds confined to several plant families and some genera of fungi and liverworts. They are divided into two structural groups, the monomeric and dimeric phthalides, and known mainly as bioactive constituents of different plant species used traditionally for medicinal purposes in Asia, Europe, and North America.The first reports on the chemistry of phthalides appeared at the end of the nineteenth century, in which they were identified as the odor constituents of the essential oil of celery (Apium graveolens) by Ciamician and Silber (1897)...
2017: Progress in the Chemistry of Organic Natural Products
https://www.readbyqxmd.com/read/28153920/the-liverwort-marchantia-drives-alternative-electron-flow-using-a-flavodiiron-protein-to-protect-psi
#11
Ginga Shimakawa, Kimitsune Ishizaki, Shigeyuki Tsukamoto, Moeko Tanaka, Takehiro Sejima, Chikahiro Miyake
The diffusion efficiency of oxygen in the atmosphere, like that of CO2, is approximately 10(4) times greater than that in aqueous environments. Consequently, terrestrial photosynthetic organisms need mechanisms to protect against potential oxidative damage. The liverwort Marchantia polymorpha, a basal land plant, has habitats where it is exposed to both water and the atmosphere. Furthermore, like cyanobacteria, M. polymorpha has genes encoding flavodiiron proteins (FLV). In cyanobacteria, FLVs mediate oxygen-dependent alternative electron flow (AEF) to suppress the production of reactive oxygen species...
March 2017: Plant Physiology
https://www.readbyqxmd.com/read/28134432/functional-ptb-phosphate-transporters-are-present-in-streptophyte-algae-and-early-diverging-land-plants
#12
Clémence Bonnot, Hélène Proust, Benoît Pinson, Florine P L Colbalchini, Alexis Lesly-Veillard, Holger Breuninger, Clément Champion, Alexander J Hetherington, Steven Kelly, Liam Dolan
Two inorganic phosphate (Pi) uptake mechanisms operate in streptophytes and chlorophytes, the two lineages of green plants. PHOSPHATE TRANSPORTER B (PTB) proteins are hypothesized to be the Na(+) /Pi symporters catalysing Pi uptake in chlorophytes, whereas PHOSPHATE TRANSPORTER 1 (PHT1) proteins are the H(+) /Pi symporters that carry out Pi uptake in angiosperms. PHT1 proteins are present in all streptophyte lineages. However, Pi uptake in streptophyte algae and marine angiosperms requires Na(+) influx, suggesting that Na(+) /Pi symporters also function in some streptophytes...
January 30, 2017: New Phytologist
https://www.readbyqxmd.com/read/28116059/geographical-structure-narrow-species-ranges-and-cenozoic-diversification-in-a-pantropical-clade-of-epiphyllous-leafy-liverworts
#13
Julia Bechteler, Alfons Schäfer-Verwimp, Gaik Ee Lee, Kathrin Feldberg, Oscar Alejandro Pérez-Escobar, Tamás Pócs, Denilson F Peralta, Matthew A M Renner, Jochen Heinrichs
The evolutionary history and classification of epiphyllous cryptogams are still poorly known. Leptolejeunea is a largely epiphyllous pantropical liverwort genus with about 25 species characterized by deeply bilobed underleaves, elliptic to narrowly obovate leaf lobes, the presence of ocelli, and vegetative reproduction by cladia. Sequences of three chloroplast regions (rbcL, trnL-F, psbA) and the nuclear ribosomal ITS region were obtained for 66 accessions of Leptolejeunea and six outgroup species to explore the phylogeny, divergence times, and ancestral areas of this genus...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28098347/evolutionary-origin-of-phytochrome-responses-and-signaling-in-land-plants
#14
REVIEW
Keisuke Inoue, Ryuichi Nishihama, Takayuki Kohchi
Phytochromes comprise one of the major photoreceptor families in plants, and they regulate many aspects of plant growth and development throughout the plant life cycle. A canonical land plant phytochrome originated in the common ancestor of streptophytes. Phytochromes have diversified in seed plants and some basal land plants due to lineage-specific gene duplications that occurred during the course of land plant evolution. Molecular genetic analyses using Arabidopsis thaliana suggested that there are two types of phytochromes in angiosperms, light-labile type I and light-stable type II, which have different signaling mechanisms and which regulate distinct responses...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28087942/the-mutualistic-interaction-between-plants-and-arbuscular-mycorrhizal-fungi
#15
Luisa Lanfranco, Paola Bonfante, Andrea Genre
Mycorrhizal fungi belong to several taxa and develop mutualistic symbiotic associations with over 90% of all plant species, from liverworts to angiosperms. While descriptive approaches have dominated the initial studies of these fascinating symbioses, the advent of molecular biology, live cell imaging, and "omics" techniques have provided new and powerful tools to decipher the cellular and molecular mechanisms that rule mutualistic plant-fungus interactions. In this article we focus on the most common mycorrhizal association, arbuscular mycorrhiza (AM), which is formed by a group of soil fungi belonging to Glomeromycota...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28057327/occurrence-of-brassinosteroids-in-non-flowering-land-plants-liverwort-moss-lycophyte-and-fern
#16
Takao Yokota, Toshiyuki Ohnishi, Kyomi Shibata, Masashi Asahina, Takahito Nomura, Tomomichi Fujita, Kimitsune Ishizaki, Takayuki Kohchi
Endogenous brassinosteroids (BRs) in non-flowering land plants were analyzed. BRs were found in a liverwort (Marchantia polymorpha), a moss (Physcomitrella patens), lycophytes (Selaginella moellendorffii and S. uncinata) and 13 fern species. A biologically active BR, castasterone (CS), was identified in most of these non-flowering plants but another biologically active BR, brassinolide, was not. It may be distinctive that levels of CS in non-flowering plants were orders of magnitude lower than those in flowering plants...
April 2017: Phytochemistry
https://www.readbyqxmd.com/read/28025543/rna-editing-and-its-molecular-mechanism-in-plant-organelles
#17
REVIEW
Mizuho Ichinose, Mamoru Sugita
RNA editing by cytidine (C) to uridine (U) conversions is widespread in plant mitochondria and chloroplasts. In some plant taxa, "reverse" U-to-C editing also occurs. However, to date, no instance of RNA editing has yet been reported in green algae and the complex thalloid liverworts. RNA editing may have evolved in early land plants 450 million years ago. However, in some plant species, including the liverwort, Marchantia polymorpha, editing may have been lost during evolution. Most RNA editing events can restore the evolutionarily conserved amino acid residues in mRNAs or create translation start and stop codons...
December 23, 2016: Genes
https://www.readbyqxmd.com/read/28007566/by-how-much-do-we-underestimate-species-diversity-of-liverworts-using-morphological-evidence-an-example-from-australasian-plagiochila-plagiochilaceae-jungermanniopsida
#18
Matt A M Renner, Margaret M Heslewood, Simon D F Patzak, Alfons Schäfer-Verwimp, Jochen Heinrichs
As a framework for revisionary study of the leafy liverwort Plagiochila in Australia, two methods for species delimitation on molecular sequence data, General Mixed Yule Coalescence model (GMYC) and Automatic Barcode Gap Discovery (ABGD) were applied to a dataset including 265 individuals from Australia, New Zealand, and the Pacific. Groups returned by GMYC and ABGD were incongruent in some lineages, and ABGD tended to lump groups. This may reflect underlying heterogeneity in the history of diversification within different lineages of Plagiochila...
December 19, 2016: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/27982074/an-adenylyl-cyclase-with-a-phosphodiesterase-domain-in-basal-plants-with-a-motile-sperm-system
#19
Masahiro Kasahara, Noriyuki Suetsugu, Yuki Urano, Chiaki Yamamoto, Mikiya Ohmori, Yuki Takada, Shujiro Okuda, Tomoaki Nishiyama, Hidetoshi Sakayama, Takayuki Kohchi, Fumio Takahashi
Adenylyl cyclase (AC), which produces the signalling molecule cAMP, has numerous important cellular functions in diverse organisms from prokaryotes to eukaryotes. Here we report the identification and characterization of an AC gene from the liverwort Marchantia polymorpha. The encoded protein has both a C-terminal AC catalytic domain similar to those of class III ACs and an N-terminal cyclic nucleotide phosphodiesterase (PDE) domain that degrades cyclic nucleotides, thus we designated the gene MpCAPE (COMBINED AC with PDE)...
December 16, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27939317/regional-growth-rate-differences-specified-by-apical-notch-activities-regulate-liverwort-thallus-shape
#20
Jeremy E Solly, Nik J Cunniffe, C Jill Harrison
Plants have undergone 470 million years of evolution on land and different groups have distinct body shapes. Liverworts are the most ancient land plant lineage and have a flattened, creeping body (the thallus), which grows from apical cells in an invaginated "notch." The genetic mechanisms regulating liverwort shape are almost totally unknown, yet they provide a blueprint for the radiation of land plant forms. We have used a combination of live imaging, growth analyses, and computational modeling to determine what regulates liverwort thallus shape in Marchantia polymorpha...
January 9, 2017: Current Biology: CB
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