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https://www.readbyqxmd.com/read/28437593/tabula-rasa-in-the-patagonian-channels-the-phylogeography-of-oreobolus-obtusangulus-cyperaceae
#1
Simon Pfanzelt, Dirk C Albach, Klaus Bernhard von Hagen
The extent of the Pleistocene glaciations in the Patagonian Channel region (southwesternmost South America) and their impact on the vegetation there is largely unknown. Whether the regional flora was wiped out completely (tabula rasa) or survived in ice-free pockets (in situ survival) is still an open question. The molecular imprint of either scenario should still be visible in extant populations. Therefore, DNA sequence data of Oreobolus obtusangulus Gaudich. (Cyperaceae) were analyzed. This species is an abundant constitutent of Patagonian cushion peat bogs, one of the Patagonian Channel region's major vegetation types...
April 24, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28437479/conformational-dynamics-of-bacterial-trigger-factor-in-apo-and-ribosome-bound-states
#2
Mehmet Tarik Can, Zeynep Kurkcuoglu, Gokce Ezeroglu, Arzu Uyar, Ozge Kurkcuoglu, Pemra Doruker
The chaperone trigger factor (TF) binds to the ribosome exit tunnel and helps cotranslational folding of nascent chains (NC) in bacterial cells and chloroplasts. In this study, we aim to investigate the functional dynamics of fully-atomistic apo TF and its complex with 50S. As TF accomodates a high percentage of charged residues on its surface, the effect of ionic strength on TF dynamics is assessed here by performing five independent molecular dynamics (MD) simulations (total of 1.3 micro-second duration) at 29 mM and 150 mM ionic strengths...
2017: PloS One
https://www.readbyqxmd.com/read/28434121/intracellular-position-of-mitochondria-in-mesophyll-cells-differs-between-c3-and-c4-grasses
#3
Yuto Hatakeyama, Osamu Ueno
In C3 plants, part of the CO2 fixed during photosynthesis in chloroplasts is released from mitochondria during photorespiration by decarboxylation of glycine via glycine decarboxylase (GDC), thereby reducing photosynthetic efficiency. The apparent positioning of most mitochondria in the interior (vacuole side of chloroplasts) of mesophyll cells in C3 grasses would increase the efficiency of refixation of CO2 released from mitochondria by ribulose 1,5-bisphosphate carboxylase/​oxygenase (Rubisco) in chloroplasts...
April 22, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28433003/the-plastid-outer-membrane-localized-lptd1-is-important-for-glycerolipid-remodeling-under-phosphate-starvation
#4
Yi-Ching Hsueh, Christian Ehmann, Nadine Flinner, Roman Ladig, Enrico Schleiff
Glycerolipid synthesis in plants is coordinated between plastids and the endoplasmic reticulum (ER). A central step within the glycerolipid synthesis is the transport of phosphatidic acid from ER to chloroplasts. The chloroplast outer envelope protein TGD4 belongs to the LptD family conserved in bacteria and plants and selectively binds and may transports phosphatidic acid. We describe a second LptD-family protein in A. thaliana (atLPTD1; At2g44640) characterized by a barrel domain with an amino acid signature typical for cyanobacterial LptDs...
April 22, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28432803/sequencing-and-functional-validation-of-the-jgi-brachypodium-distachyon-t-dna-collection
#5
Mon Mandy Hsia, Ronan O'Malley, Amy Cartwright, Rita Nieu, Sean P Gordon, Sandra Kelly, Tina G Williams, Delilah F Wood, Yunjun Zhao, Jennifer Bragg, Mark Jordan, Markus Pauly, Joseph R Ecker, Yong Gu, John P Vogel
Due to a large and growing collection of genomic and experimental resources, Brachypodium distachyon has emerged as a powerful experimental model for the grasses. To add to these resources we sequenced 21,165 T-DNA lines, 15,569 of which were produced in this study. This increased the number of unique insertion sites in the T-DNA collection by 21,078 bringing the overall total to 26,112. Thirty seven percent (9,754) of these insertion sites are within genes (including UTRs and introns) and 28% (7,217) are within 500 bp of a gene...
April 22, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28432544/expression-of-cphb-and-cphe-type-cyanophycinases-in-cyanophycin-producing-tobacco-and-comparison-of-their-ability-to-degrade-cyanophycin-in-plant-and-plant-extracts
#6
Daniel Ponndorf, Inge Broer, Henrik Nausch
Increasing the arginine (Arg) content in plants used as feed or food is of interest, since the supplementation of food with conditionally essential Arg has been shown to have nutritional benefits. An increase was achieved by the expression of the Arg-rich bacterial storage component, cyanophycin (CGP), in the chloroplast of transgenic plants. CGP is stable in plants and its degradation into β-aspartic acid (Asp)-Arg dipeptides, is solely catalyzed by bacterial cyanophycinases (CGPase). Dipeptides can be absorbed by animals even more efficiently than free amino acids (Matthews and Adibi 1976; Wenzel et al...
April 21, 2017: Transgenic Research
https://www.readbyqxmd.com/read/28432538/superoxide-generated-in-the-chloroplast-stroma-causes-photoinhibition-of-photosystem-i-in-the-shade-establishing-tree-species-psychotria-henryi
#7
Wei Huang, Ying-Jie Yang, Jiao-Lin Zhang, Hong Hu, Shi-Bao Zhang
Our previous studies indicated that high light induced significant photoinhibition of photosystem I (PSI) in the shade-establishing tree species Psychotria henryi. However, the underlying mechanism has not been fully clarified. In the present study, in order to investigate the mechanism of PSI photoinhibition in P. henryi, we treated detached leaves with constant high light in the presence of methyl viologen (MV) or a soluble α-tocopherol analog, 2,2,5,7,8-pentamethyl-6-chromanol (PMC). We found that MV significantly depressed photochemical quantum yields in PSI and PSII when compared to PMC...
April 21, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28432257/excess-diffuse-light-absorption-in-upper-mesophyll-limits-co2-drawdown-and-depresses-photosynthesis
#8
Jeffrey Mason Earles, Guillaume Théroux-Rancourt, Matthew E Gilbert, Andrew J McElrone, Craig Brodersen
In agricultural and natural systems, diffuse light can enhance plant primary productivity due to deeper penetration into and greater illumination of the entire canopy. However, for individual sun-grown leaves from three species, photosynthesis is actually less efficient under diffuse compared to direct light. Despite its potential impact on canopy-level productivity, the mechanism for this leaf-level 'diffuse light photosynthetic depression' effect is unknown. Here we investigate if the spatial distribution of light absorption relative to electron transport capacity in sun- and shade-grown H...
April 21, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28430826/geographic-origin-and-individual-assignment-of-shorea-platyclados-dipterocarpaceae-for-forensic-identification
#9
Chin Hong Ng, Soon Leong Lee, Lee Hong Tnah, Kevin Kit Siong Ng, Chai Ting Lee, Bibian Diway, Eyen Khoo
The development of timber tracking methods based on genetic markers can provide scientific evidence to verify the origin of timber products and fulfill the growing requirement for sustainable forestry practices. In this study, the origin of an important Dark Red Meranti wood, Shorea platyclados, was studied by using the combination of seven chloroplast DNA and 15 short tandem repeats (STRs) markers. A total of 27 natural populations of S. platyclados were sampled throughout Malaysia to establish population level and individual level identification databases...
2017: PloS One
https://www.readbyqxmd.com/read/28429727/selection-of-relatively-exact-reference-genes-for-gene-expression-studies-in-goosegrass-eleusine-indica-under-herbicide-stress
#10
Jingchao Chen, Zhaofeng Huang, Hongjuan Huang, Shouhui Wei, Yan Liu, Cuilan Jiang, Jie Zhang, Chaoxian Zhang
Goosegrass (Eleusine indica) is one of the most serious annual grassy weeds worldwide, and its evolved herbicide-resistant populations are more difficult to control. Quantitative real-time PCR (qPCR) is a common technique for investigating the resistance mechanism; however, there is as yet no report on the systematic selection of stable reference genes for goosegrass. This study proposed to test the expression stability of 9 candidate reference genes in goosegrass in different tissues and developmental stages and under stress from three types of herbicide...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429530/retraction-each-of-the-chloroplast-potassium-efflux-antiporters-affects-photosynthesis-and-growth-of-fully-developed-arabidopsis-rosettes-under-short-day-photoperiod-by-somnath-dana-andrei-herdean-bj%C3%A3-rn-lundin-and-cornelia-spetea
#11
https://www.readbyqxmd.com/read/28429323/protein-targeting-to-the-plastid-of-euglena
#12
Dion G Durnford, Steven D Schwartzbach
The lateral transfer of photosynthesis between kingdoms through endosymbiosis is among the most spectacular examples of evolutionary innovation. Euglena, which acquired a chloroplast indirectly through an endosymbiosis with a green alga, represents such an example. As with other endosymbiont-derived plastids from eukaryotes, there are additional membranes that surround the organelle, of which Euglena has three. Thus, photosynthetic genes that were transferred from the endosymbiont to the host nucleus and whose proteins are required in the new plastid, are now faced with targeting and plastid import challenges...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429322/photo-and-nutritional-regulation-of-euglena-organelle-development
#13
Steven D Schwartzbach
Euglena can use light and CO2, photosynthesis, as well as a large variety of organic molecules as the sole source of carbon and energy for growth. Light induces the enzymes, in this case an entire organelle, the chloroplast, that is required to use CO2 as the sole source of carbon and energy for growth. Ethanol, but not malate, inhibits the photoinduction of chloroplast enzymes and induces the synthesis of the glyoxylate cycle enzymes that comprise the unique metabolic pathway leading to two carbon, ethanol and acetate, assimilation...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429321/euglena-transcript-processing
#14
David C McWatters, Anthony G Russell
RNA transcript processing is an important stage in the gene expression pathway of all organisms and is subject to various mechanisms of control that influence the final levels of gene products. RNA processing involves events such as nuclease-mediated cleavage, removal of intervening sequences referred to as introns and modifications to RNA structure (nucleoside modification and editing). In Euglena, RNA transcript processing was initially examined in chloroplasts because of historical interest in the secondary endosymbiotic origin of this organelle in this organism...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429319/biochemistry-and-physiology-of-heavy-metal-resistance-and-accumulation-in-euglena
#15
Rafael Moreno-Sánchez, Sara Rodríguez-Enríquez, Ricardo Jasso-Chávez, Emma Saavedra, Jorge D García-García
Free-living microorganisms may become suitable models for removal of heavy metals from polluted water bodies, sediments, and soils by using and enhancing their metal accumulating abilities. The available research data indicate that protists of the genus Euglena are a highly promising group of microorganisms to be used in bio-remediation of heavy metal-polluted aerobic and anaerobic acidic aquatic environments. This chapter analyzes the variety of biochemical mechanisms evolved in E. gracilis to resist, accumulate and remove heavy metals from the environment, being the most relevant those involving (1) adsorption to the external cell pellicle; (2) intracellular binding by glutathione and glutathione polymers, and their further compartmentalization as heavy metal-complexes into chloroplasts and mitochondria; (3) polyphosphate biosynthesis; and (4) secretion of organic acids...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429317/biochemistry-and-physiology-of-reactive-oxygen-species-in-euglena
#16
Takahiro Ishikawa, Shun Tamaki, Takanori Maruta, Shigeru Shigeoka
Reactive oxygen species (ROS) such as superoxide and hydrogen peroxide are by-products of various metabolic processes in aerobic organisms including Euglena. Chloroplasts and mitochondria are the main sites of ROS generation by photosynthesis and respiration, respectively, through the active electron transport chain. An efficient antioxidant network is required to maintain intracellular ROS pools at optimal conditions for redox homeostasis. A comparison with the networks of plants and animals revealed that Euglena has acquired some aspects of ROS metabolic process...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429314/evolutionary-origin-of-euglena
#17
Bożena Zakryś, Rafał Milanowski, Anna Karnkowska
Euglenids (Excavata, Discoba, Euglenozoa, Euglenida) is a group of free-living, single-celled flagellates living in the aquatic environments. The uniting and unique morphological feature of euglenids is the presence of a cell covering called the pellicle. The morphology and organization of the pellicle correlate well with the mode of nutrition and cell movement. Euglenids exhibit diverse modes of nutrition, including phagotrophy and photosynthesis. Photosynthetic species (Euglenophyceae) constitute a single subclade within euglenids...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28428810/recent-achievements-obtained-by-chloroplast-transformation
#18
REVIEW
Muhamed Adem, Dereje Beyene, Tileye Feyissa
Chloroplasts play a great role for sustained wellbeing of life on the planet. They have the power and raw materials that can be used as sophisticated biological factories. They are rich in energy as they have lots of pigment-protein complexes capable of collecting sunlight, in sugar produced by photosynthesis and in minerals imported from the plant cell. Chloroplast genome transformation offers multiple advantages over nuclear genome which among others, include: integration of the transgene via homologus recombination that enables to eliminate gene silencing and position effect, higher level of transgene expression resulting into higher accumulations of foreign proteins, and significant reduction in environmental dispersion of the transgene due to maternal inheritance which helps to minimize the major critic of plant genetic engineering...
2017: Plant Methods
https://www.readbyqxmd.com/read/28428552/divergent-copies-of-the-large-inverted-repeat-in-the-chloroplast-genomes-of-ulvophycean-green-algae
#19
Monique Turmel, Christian Otis, Claude Lemieux
The chloroplast genomes of many algae and almost all land plants carry two identical copies of a large inverted repeat (IR) sequence that can pair for flip-flop recombination and undergo expansion/contraction. Although the IR has been lost multiple times during the evolution of the green algae, the underlying mechanisms are still largely unknown. A recent comparison of IR-lacking and IR-containing chloroplast genomes of chlorophytes from the Ulvophyceae (Ulotrichales) suggested that differential elimination of genes from the IR copies might lead to IR loss...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28426975/the-regulation-of-the-chloroplast-proton-motive-force-plays-a-key-role-for-photosynthesis-in-fluctuating-light
#20
REVIEW
Ute Armbruster, Viviana Correa Galvis, Hans-Henning Kunz, Deserah D Strand
Plants use sunlight as their primary energy source. During photosynthesis, absorbed light energy generates reducing power by driving electron transfer reactions. These are coupled to the transfer of protons into the thylakoid lumen, generating a proton motive force (pmf) required for ATP synthesis. Sudden alterations in light availability have to be met by regulatory mechanisms to avoid the over-accumulation of reactive intermediates and maximize energy efficiency. Here, the acidification of the lumen, as an intermediate product of photosynthesis, plays an important role by regulating photosynthesis in response to excitation energy levels...
April 17, 2017: Current Opinion in Plant Biology
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