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https://www.readbyqxmd.com/read/28892172/evolutionary-conservation-of-structure-and-function-of-the-uvr8-photoreceptor-from-the-liverwort-marchantia-polymorpha-and-the-moss-physcomitrella-patens
#1
Gonzalo Soriano, Catherine Cloix, Monika Heilmann, Encarnación Núñez-Olivera, Javier Martínez-Abaigar, Gareth I Jenkins
The ultraviolet-B (UV-B) photoreceptor UV RESISTANCE LOCUS 8 (UVR8) mediates photomorphogenic responses to UV-B in Arabidopsis through differential gene expression, but little is known about UVR8 in other species. Bryophyte lineages were the earliest diverging embryophytes, thus being the first plants facing the UV-B regime typical of land. We therefore examined whether liverwort and moss species have functional UVR8 proteins and whether they are regulated similarly to Arabidopsis UVR8. We examined the expression, dimer/monomer status, cellular localisation and function of Marchantia polymorpha and Physcomitrella patens UVR8 in experiments with bryophyte tissue and expression of green fluorescent protein (GFP)-UVR8 fusions in Nicotiana leaves and transgenic Arabidopsis...
September 11, 2017: New Phytologist
https://www.readbyqxmd.com/read/28884383/phosphorus-and-nitrogen-co-limitation-of-forest-ground-vegetation-under-elevated-anthropogenic-nitrogen-deposition
#2
Per-Ola Hedwall, Johan Bergh, Jörg Brunet
Plant growth in northern forest ecosystems is considered to be primarily nitrogen limited. Nitrogen deposition is predicted to change this towards co-limitation/limitation by other nutrients (e.g., phosphorus), although evidence of such stoichiometric effects is scarce. We utilized two forest fertilization experiments in southern Sweden to analyze single and combined effects of nitrogen and phosphorus on the productivity, composition, and diversity of the ground vegetation. Our results indicate that the productivity of forest ground vegetation in southern Sweden is co-limited by nitrogen and phosphorus...
September 7, 2017: Oecologia
https://www.readbyqxmd.com/read/28835265/conservation-and-divergence-of-small-rna-pathways-and-micrornas-in-land-plants
#3
Chenjiang You, Jie Cui, Hui Wang, Xinping Qi, Li-Yaung Kuo, Hong Ma, Lei Gao, Beixin Mo, Xuemei Chen
BACKGROUND: As key regulators of gene expression in eukaryotes, small RNAs have been characterized in many seed plants, and pathways for their biogenesis, degradation, and action have been defined in model angiosperms. However, both small RNAs themselves and small RNA pathways are not well characterized in other land plants such as lycophytes and ferns, preventing a comprehensive evolutionary perspective on small RNAs in land plants. RESULTS: Using 25 representatives from major lineages of lycophytes and ferns, most of which lack sequenced genomes, we characterized small RNAs and small RNA pathways in these plants...
August 23, 2017: Genome Biology
https://www.readbyqxmd.com/read/28802879/quadrulella-texcalense-sp-nov-from-a-mexican-desert-an-unexpected-new-environment-for-hyalospheniid-testate-amoebae
#4
Horacio Pérez-Juárez, Angélica Serrano-Vázquez, Anush Kosakyan, Edward A D Mitchell, Víctor M Rivera Aguilar, Daniel J G Lahr, Mayra M Hernández Moreno, Humberto Macías Cuellar, Luis E Eguiarte, Enrique Lara
Quadrulella (Amoebozoa, Arcellinida, Hyalospheniidae) is a genus of testate amoebae with unmistakable morphology, which secretes characteristic square plates to reinforce the test. They are mainly known from fens and freshwater habitats and have never been documented in deserts. We describe a new species, Quadrulella texcalense, from biological soil crusts in the intertropical desert of Tehuacán (state of Puebla, Mexico). Quadrulella texcalense occurred only at altitudes between 2140 and 2221m.a.s.l., together with the bryophyte genera Pseudocrossidium, Weissia, Bryum, Didymodon, Neohyophyla and Aloina...
July 17, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28790328/desiccation-tolerance-in-bryophytes-the-dehydration-and-rehydration-transcriptomes-in-the-desiccation-tolerant-bryophyte-bryum-argenteum
#5
Bei Gao, Xiaoshuang Li, Daoyuan Zhang, Yuqing Liang, Honglan Yang, Moxian Chen, Yuanming Zhang, Jianhua Zhang, Andrew J Wood
The desiccation tolerant bryophyte Bryum argenteum is an important component of desert biological soil crusts (BSCs) and is emerging as a model system for studying vegetative desiccation tolerance. Here we present and analyze the hydration-dehydration-rehydration transcriptomes in B. argenteum to establish a desiccation-tolerance transcriptomic atlas. B. argenteum gametophores representing five different hydration stages (hydrated (H0), dehydrated for 2 h (D2), 24 h (D24), then rehydrated for 2 h (R2) and 48 h (R48)), were sampled for transcriptome analyses...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28765721/on-the-diversity-and-richness-of-understory-bryophytes-at-nectandra-cloud-forest-reserve-costa-rica
#6
Daniel H Norris, Ekaphan Kraichak, Allen C Risk, Diane Lucas, Dorothy J Allard, Frida Rosengren, Theresa A Clark, Nicole Fenton, Michael Tessler, Nonkululo Phephu, Evelyne T Lennette
BACKGROUND: A survey of the understory bryophytes in the Nectandra Cloud Forest Preserve yielded 1083 specimens distributed among 55 families, represented by 74 genera of mosses, 75 genera of liverworts and 3 of hornworts. We studied and analyzed the bryophytic distribution on six types of substrates: 1) corticolous, 2) epiphyllous, 3) saxicolous, 4) terricolous, 5) aquatic and 6) lignicolous. The richness and composition of bryophyte genera are compared to those of other previous bryophyte surveys from 4 other sites with different oceanic exposures, climatic and geographic conditions in Costa Rica...
2017: Biodiversity Data Journal
https://www.readbyqxmd.com/read/28749584/the-aldh21-gene-found-in-lower-plants-and-some-vascular-plants-codes-for-a-nadp-dependent-succinic-semialdehyde-dehydrogenase
#7
Martina Kopečná, Armelle Vigouroux, Jan Vilím, Radka Končitíková, Pierre Briozzo, Eva Hájková, Lenka Jašková, Klaus von Schwartzenberg, Marek Šebela, Solange Moréra, David Kopečný
Lower plant species including some green algae, non-vascular plants (bryophytes) as well as the oldest vascular plants (lycopods) and ferns (monilophytes) possess a unique aldehyde dehydrogenase (ALDH) gene named ALDH21, which is upregulated during dehydration. However, the gene is absent in flowering plants. Here, we show that ALDH21 from the moss Physcomitrella patens codes for a tetrameric NADP(+) -dependent succinic semialdehyde dehydrogenase (SSALDH), which converts succinic semialdehyde, an intermediate of the γ-aminobutyrate (GABA) shunt pathway, into succinate in the cytosol...
July 27, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28742881/epiphytes-in-wooded-pastures-isolation-matters-for-lichen-but-not-for-bryophyte-species-richness
#8
Thomas Kiebacher, Christine Keller, Christoph Scheidegger, Ariel Bergamini
Sylvo-pastoral systems are species-rich man-made landscapes that are currently often severely threatened by abandonment or management intensification. At low tree densities, single trees in these systems represent habitat islands for epiphytic cryptogams. Here, we focused on sycamore maple (Acer pseudoplatanus) wooded pastures in the northern European Alps. We assessed per tree species richness of bryophytes and lichens on 90 sycamore maple trees distributed across six study sites. We analysed the effects of a range of explanatory variables (tree characteristics, environmental variables and isolation measures) on the richness of epiphytic bryophytes and lichens and various functional subgroups (based on diaspore size, habitat preference and red list status)...
2017: PloS One
https://www.readbyqxmd.com/read/28737761/glutamate-receptor-like-channels-are-essential-for-chemotaxis-and-reproduction-in-mosses
#9
Carlos Ortiz-Ramírez, Erwan Michard, Alexander A Simon, Daniel S C Damineli, Marcela Hernández-Coronado, Jörg D Becker, José A Feijó
Glutamate receptors are well characterized channels that mediate cell-to-cell communication during neurotransmission in animals. Nevertheless, information regarding their functional role in organisms without nervous systems is still limited. In plants, Glutamate Receptor-like (GLR) genes have been implicated in defence against pathogens, reproduction, control of stomata aperture and light signal transduction(1-5). However, the numerous GLR genes present in angiosperm genomes (20 to 70)(6) has prevented the observation of strong phenotypes in loss-of-function mutants...
July 24, 2017: Nature
https://www.readbyqxmd.com/read/28735405/profiling-abscisic-acid-induced-changes-in-fatty-acid-composition-in-mosses
#10
Suhas Shinde, Shivakumar Devaiah, Aruna Kilaru
In plants, change in lipid composition is a common response to various abiotic stresses. Lipid constituents of bryophytes are of particular interest as they differ from that of flowering plants. Unlike higher plants, mosses have high content of very long-chain polyunsaturated fatty acids. Such lipids are considered to be important for survival of nonvascular plants. Here, using abscisic acid (ABA )-induced changes in lipid composition in Physcomitrella patens as an example, a protocol for total lipid extraction and quantification by gas chromatography (GC) coupled with flame ionization detector (FID) is described...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28695681/bi-directional-cos-exchange-in-bryophytes-challenges-its-use-as-a-tracer-for-gross-primary-productivity
#11
Georg Wohlfahrt
No abstract text is available yet for this article.
August 2017: New Phytologist
https://www.readbyqxmd.com/read/28676660/drp3-and-elm1-are-required-for-mitochondrial-fission-in-the-liverwort-marchantia-polymorpha
#12
Nagisa Nagaoka, Akihiro Yamashita, Rina Kurisu, Yuta Watari, Fumiko Ishizuna, Nobuhissro Tsutsumi, Kimitsune Ishizaki, Takayuki Kohchi, Shin-Ichi Arimura
Mitochondria increase in number by the fission of existing mitochondria. Mitochondrial fission is needed to provide mitochondria to daughter cells during cell division. In Arabidopsis thaliana, four kinds of genes have been reported to be involved in mitochondrial fission. Two of them, DRP3 (dynamin-related protein3) and FIS1 (FISSION1), are well conserved in eukaryotes. The other two are plant-specific ELM1 (elongated mitochondria1) and PMD (peroxisomal and mitochondrial division). To better understand the commonality and diversity of mitochondrial fission factors in land plants, we examined mitochondrial fission-related genes in a liverwort, Marchantia polymorpha...
July 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28666381/the-evolution-of-hydrophobic-cell-wall-biopolymers-from-algae-to-angiosperms
#13
Karl J Niklas, Edward D Cobb, Antonio J Matas
The transition from an aquatic ancestral condition to a terrestrial environment exposed the first land plants to the desiccating effects of air and potentially large fluctuations in temperature and light intensity. To be successful, this transition necessitated metabolic, physiological, and morphological modifications, among which one of the most important was the capacity to synthesize hydrophobic extracellular biopolymers such as those found in the cuticular membrane, suberin, lignin, and sporopollenin, which collectively reduce the loss of water, provide barriers to pathogens, protect against harmful levels of UV radiation, and rigidify targeted cell walls...
June 29, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28645261/genome-wide-analysis-of-udp-glycosyltransferase-super-family-in-brassica-rapa-and-brassica-oleracea-reveals-its-evolutionary-history-and-functional-characterization
#14
Jingyin Yu, Fan Hu, Komivi Dossa, Zhaokai Wang, Tao Ke
BACKGROUND: Glycosyltransferases comprise a highly divergent and polyphyletic multigene family that is involved in widespread modification of plant secondary metabolites in a process called glycosylation. According to conserved domains identified in their amino acid sequences, these glycosyltransferases can be classified into a single UDP-glycosyltransferase (UGT) 1 superfamily. RESULTS: We performed genome-wide comparative analysis of UGT genes to trace evolutionary history in algae, bryophytes, pteridophytes, and angiosperms; then, we further investigated the expansion mechanisms and function characterization of UGT gene families in Brassica rapa and Brassica oleracea...
June 23, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28604835/correction-total-flavonoid-concentrations-of-bryophytes-from-tianmu-mountain-zhejiang-province-china-phylogeny-and-ecological-factors
#15
Xin Wang, Jianguo Cao, Xiling Dai, Jianbo Xiao, Yuhuan Wu, Quanxi Wang
[This corrects the article DOI: 10.1371/journal.pone.0173003.].
2017: PloS One
https://www.readbyqxmd.com/read/28603535/stand-structure-and-substrate-diversity-as-two-major-drivers-for-bryophyte-distribution-in-a-temperate-montane-ecosystem
#16
Yun Chen, Shuai Niu, Peikun Li, Hongru Jia, Hailiang Wang, Yongzhong Ye, Zhiliang Yuan
Elucidating the major drivers of bryophyte distribution is the first step to protecting bryophyte diversity. Topography, forest, substrates (ground, tree trunks, roots, rocks, and rotten wood), and spatial factor, which factors are the major drivers of bryophyte distribution? In this study, 53 plots were set in 400 m(2) along the elevation gradient in Xiaoqinling, China. All bryophytes in the plots were collected and identified. Regression analysis was used to examine the relationship between bryophyte and substrate diversity...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28587992/the-isolation-and-functional-characterization-of-three-liverwort-genes-encoding-cinnamate-4-hydroxylase
#17
Xin-Yan Liu, Hai-Na Yu, Shuai Gao, Yi-Feng Wu, Ai-Xia Cheng, Hong-Xiang Lou
The plant phenylpropanoid pathway is responsible for the synthesis of a wide variety of secondary metabolites. The second step in phenylpropanoid synthesis is carried out by the cytochrome P450 monooxygenase enzyme cinnamate 4-hydroxylase (C4H), which catalyzes the p-hydroxylation of trans-cinnamic acid to p-coumarate. Genes encoding C4H have been characterized in many vascular plant species, but as yet not in any bryophyte species. Here, a survey of the transcriptome sequences of four liverwort species was able to identify eight putative C4Hs...
May 26, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28572458/the-dnaj-like-zinc-finger-protein-hcf222-is-required-for-thylakoid-membrane-biogenesis-in-plants
#18
Stephanie Hartings, Susanne Paradies, Bianca Karnuth, Sabrina Eisfeld, Jasmin Mehsing, Christian Wolff, Tatjana Levey, Peter Westhoff, Karin Meierhoff
To understand the biogenesis of the thylakoid membrane in higher plants and to identify auxiliary proteins required to build up this highly complex membrane system, we have characterized the allelic nuclear mutants high chlorophyll fluorescence222-1 (hcf222-1) and hcf222-2 and isolated the causal gene by map-based cloning. In the ethyl methanesulfonate-induced mutant hcf222-1, the accumulation of the cytochrome b6f (Cytb6f) complex was reduced to 30% compared with the wild type. Other thylakoid membrane complexes accumulated to normal levels...
July 2017: Plant Physiology
https://www.readbyqxmd.com/read/28527144/the-effects-of-experimentally-supplied-lead-nitrate-on-three-common-mediterranean-moss-species
#19
Jennifer Cogolludo, Belén Estébanez, Nagore G Medina
We assess here, through an experimental simulation using lead nitrate, the response to lead deposition of three common Mediterranean bryophyte species in the family Pottiaceae. Five concentrations of lead nitrate (from 0 to 10(-3) M) were sprayed for 4 months on plants belonging to Tortula muralis (reported as toxitolerant), Syntrichia ruralis (medium-tolerant), and Tortula subulata (less tolerant). The three species showed a remarkably high tolerance to lead nitrate, with a low incidence of damage even at concentrations as high as 10(-4) M...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28505373/gene-duplication-leads-to-altered-membrane-topology-of-a-cytochrome-p450-enzyme-in-seed-plants
#20
Hugues Renault, Minttu De Marothy, Gabriella Jonasson, Patricia Lara, David R Nelson, IngMarie Nilsson, François André, Gunnar von Heijne, Danièle Werck-Reichhart
Evolution of the phenolic metabolism was critical for the transition of plants from water to land. A cytochrome P450, CYP73, with cinnamate 4-hydroxylase (C4H) activity, catalyzes the first plant-specific and rate-limiting step in this pathway. The CYP73 gene is absent from green algae, and first detected in bryophytes. A CYP73 duplication occurred in the ancestor of seed plants and was retained in Taxaceae and most angiosperms. In spite of a clear divergence in primary sequence, both paralogs can fulfill comparable cinnamate hydroxylase roles both in vitro and in vivo...
May 15, 2017: Molecular Biology and Evolution
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