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https://www.readbyqxmd.com/read/28531251/ca2-dependent-phosphoregulation-of-the-plasma-membrane-ca2-atpase-aca8-modulates-stimulus-induced-calcium-signatures
#1
Alex Costa, Laura Luoni, Claudia Adriana Marrano, Kenji Hashimoto, Philipp Köster, Sonia Giacometti, Maria Ida De Michelis, Jörg Kudla, Maria Cristina Bonza
Ca2+ signals are transient, hence, upon a stimulus-induced increase in cytosolic Ca2+ concentration, cells have to re-establish resting Ca2+ levels. Ca2+ extrusion is operated by a wealth of transporters, such as Ca2+ pumps and Ca2+/H+ antiporters, which often require a rise in Ca2+ concentration to be activated. Here, we report a regulatory fine-tuning mechanism of the Arabidopsis thaliana plasma membrane-localized Ca2+-ATPase isoform ACA8 that is mediated by calcineurin B-like protein (CBL) and CBL-interacting protein kinase (CIPK) complexes...
May 20, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28520800/transcriptome-profiling-revealed-novel-transcriptional-regulators-in-maize-responses-to-ostrinia-furnacalis-and-jasmonic-acid
#2
Hai Wang, Shengyan Li, Shouzhen Teng, Haisheng Liang, Hongjia Xin, Hongjiang Gao, Dafang Huang, Zhihong Lang
Chewing insects cause severe yield losses in crop production worldwide. Crop plants counteract chewing insects by transcriptionally promoting a repertoire of defense gene products that are either toxic to, or attractive to the natural enemies of, pest insects. However, the complexity of the transcriptional reprogramming in plant defense response against chewing insects is still not well understood. In this study, the genome-wide early responses in maize seedlings to Asian corn borer (ACB, Ostrinia furnacalis) and also to jasmonic acid(JA), the pivotal phytohormone controlling plant defense response against herbivory, were transcriptionally profiled by RNA-Seq...
2017: PloS One
https://www.readbyqxmd.com/read/28513600/temporal-dynamics-of-gene-expression-and-histone-marks-at-the-arabidopsis-shoot-meristem-during-flowering
#3
Yuan You, Aneta Sawikowska, Manuela Neumann, David Posé, Giovanna Capovilla, Tobias Langenecker, Richard A Neher, Paweł Krajewski, Markus Schmid
Plants can produce organs throughout their entire life from pluripotent stem cells located at their growing tip, the shoot apical meristem (SAM). At the time of flowering, the SAM of Arabidopsis thaliana switches fate and starts producing flowers instead of leaves. Correct timing of flowering in part determines reproductive success, and is therefore under environmental and endogenous control. How epigenetic regulation contributes to the floral transition has eluded analysis so far, mostly because of the poor accessibility of the SAM...
May 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28510257/strategy-for-selection-of-soybean-genotypes-tolerant-to-drought-during-germination
#4
S A G Dantas, F C S Silva, L J Silva, F L Silva
Water deficit is the main reason for instability in the context of soybean culture. The development of strategies for the selection of more tolerant genotypes is necessary. These strategies include the use of polyethylene glycol 6000 solutions (PEG-6000) for conducting the germination test under conditions of water restriction. Thus, the objective of this study was to determine the osmotic potential and the main characteristics that promote the discrimination of soybean genotypes with regard to water stress tolerance during germination and the vigor test...
May 10, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28489029/comparative-analysis-of-the-major-chemical-constituents-in-salvia-miltiorrhiza-roots-stems-leaves-and-flowers-during-different-growth-periods-by-uplc-tq-ms-ms-and-hplc-elsd-methods
#5
Huiting Zeng, Shulan Su, Xiang Xiang, Xiuxiu Sha, Zhenhua Zhu, Yanyan Wang, Sheng Guo, Hui Yan, Dawei Qian, Jinao Duan
Salvia miltiorrhiza is a traditional Chinese herbal medicine containing multiple components that contribute to its notable bioactivities. This article investigated the distribution and dynamic changes of chemical constituents in various parts of S. miltiorrhiza from different growth periods. An ultra-high performance liquid chromatography-triple quadrupole mass spectrometer (UPLC-TQ-MS/MS) and high-performance liquid chromatography coupled with evaporative light scattering detector (HPLC-ELSD) methods were developed for accurate determination of 24 compounds (including phenolic acids, flavonoids, triterpenes, and saccharides) in S...
May 10, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28475718/within-plant-distribution-and-dynamics-of-thrips-species-thysanoptera-thripidae-in-cotton
#6
Francis P F Reay-Jones, Jeremy K Greene, D Ames Herbert, Alana L Jacobson, George G Kennedy, Dominic D Reisig, Phillip M Roberts
A 2-yr study in cotton (Gossypium hirsutum L.) was conducted to determine the abundance and species composition of thrips (Thysanoptera: Thripidae) on different plant parts throughout the season in Alabama, Georgia, North Carolina, South Carolina, and Virginia. Plant parts sampled included seedlings, terminals with two expanded leaves, leaves from the upper, middle, and lower sections of the canopy, white flowers, and medium-sized bolls. Adult thrips were significantly more abundant on seedlings and flowers in 2014, and on flowers followed by seedlings and leaves from the middle canopy in 2015...
May 5, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28467488/accelerated-development-in-johnsongrass-seedlings-sorghum-halepense-suppresses-the-growth-of-native-grasses-through-size-asymmetric-competition
#7
Susanne Schwinning, Heather Meckel, Lara G Reichmann, H Wayne Polley, Philip A Fay
Invasive plant species often dominate native species in competition, augmenting other potential advantages such as release from natural enemies. Resource pre-emption may be a particularly important mechanism for establishing dominance over competitors of the same functional type. We hypothesized that competitive success of an exotic grass against native grasses is mediated by establishing an early size advantage. We tested this prediction among four perennial C4 warm-season grasses: the exotic weed Johnsongrass (Sorghum halepense), big bluestem (Andropogon gerardii), little bluestem (Schizachyrium scoparius) and switchgrass (Panicum virgatum)...
2017: PloS One
https://www.readbyqxmd.com/read/28467463/flooding-tolerance-of-four-floodplain-meadow-species-depends-on-age
#8
Johannes P Gattringer, Tobias W Donath, R Lutz Eckstein, Kristin Ludewig, Annette Otte, Sarah Harvolk-Schöning
Numerous restoration campaigns focused on re-establishing species-rich floodplain meadows of Central Europe, whose species composition is essentially controlled by regular flooding. Climate change predictions expect strong alterations on the discharge regime of Europe's large rivers with little-known consequences on floodplain meadow plants. In this study, we aim to determine the effects of flooding on seedlings of different ages of four typical flood meadow species. To this end, we flooded seedlings of two familial pairs of flood meadow species of wetter and dryer microhabitats for 2 weeks each, starting 2, 4, 6, and 8 weeks after seedling germination, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28449392/osmotic-stress-decreases-complexity-underlying-the-electrophysiological-dynamic-in-soybean
#9
G F R Saraiva, A S Ferreira, G M Souza
Research rationale: Studies on plant electrophysiology are mostly focused on specific traits of single cells. Inspired by the complexity of the signaling network in plants and by analogies with neurons in human brains, we have sought for evidences of high complexity in the electrical dynamics of plant signaling and a likely relation with environmental cues. Central methods: An EEG-like standard protocol was adopted for high-resolution measurements of the electrical signal in Glycine max seedlings. The signals were continuously recorded in the same plants before and after the osmotic stimuli with a -2 MPa mannitol solution...
April 27, 2017: Plant Biology
https://www.readbyqxmd.com/read/28447370/vulnerability-to-forest-loss-through-altered-postfire-recovery-dynamics-in-a-warming-climate-in-the-klamath-mountains
#10
Alan J Tepley, Jonathan R Thompson, Howard E Epstein, Kristina J Anderson-Teixeira
In the context of ongoing climatic warming, certain landscapes could be near a tipping point where relatively small changes to their fire regimes or their postfire forest recovery dynamics could bring about extensive forest loss, with associated effects on biodiversity and carbon-cycle feedbacks to climate change. Such concerns are particularly valid in the Klamath Region of northern California and southwestern Oregon, where severe fire initially converts montane conifer forests to systems dominated by broadleaf trees and shrubs...
April 27, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28439285/a-quantitative-proteomic-analysis-of-brassinosteroid-induced-protein-phosphorylation-in-rice-oryza-sativa-l
#11
Yuxuan Hou, Jiehua Qiu, Yifeng Wang, Zhiyong Li, Juan Zhao, Xiaohong Tong, Haiyan Lin, Jian Zhang
The group of polyhydroxysteroid phytohormones referred to as the brassinosteroids (BRs) is known to act on plant development and the stress response. BR signal transduction relies largely on protein phosphorylation. By employing a label-free, MS (Mass Spectrometry)-based phosphoproteomic approach, we report here the largest profiling of 4,034 phosphosites on 1,900 phosphoproteins from rice young seedlings and their dynamic response to BR. 1,821 proteins, including kinases, transcription factors and core components of BR and other hormone signaling pathways, were found to be differentially phosphorylated during the BR treatment...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28432768/the-fate-of-recently-fixed-carbon-after-drought-release-towards-unravelling-c-storage-regulation-in-tilia-platyphyllos-and-pinus-sylvestris
#12
Lucía Galiano Pérez, Galina Timofeeva, Matthias Saurer, Rolf Siegwolf, Jordi Martínez-Vilalta, Robert Hommel, Arthur Gessler
Carbon reserves are important for maintaining tree function during and after stress. Increasing tree mortality driven by drought globally has renewed the interest in how plants regulate allocation of recently fixed C to reserve formation. Three year-old seedlings of two species (Tilia platyphyllos, Pinus sylvestris) were exposed to two intensities of experimental drought during ~ 10 weeks and (13) C pulse labelling was subsequently applied with rewetting. Tracking the (13) C-label across different organs and C compounds (soluble sugars, starch, myo-inositol, lipids and cellulose), together with the monitoring of gas exchange and C mass balances over time, allowed for the identification of variations in C allocation priorities and tree C balances that are associated to drought effects and subsequent drought release...
April 22, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28420793/regulating-plant-physiology-with-organic-electronics
#13
David J Poxson, Michal Karady, Roger Gabrielsson, Aziz Y Alkattan, Anna Gustavsson, Siamsa M Doyle, Stéphanie Robert, Karin Ljung, Markus Grebe, Daniel T Simon, Magnus Berggren
The organic electronic ion pump (OEIP) provides flow-free and accurate delivery of small signaling compounds at high spatiotemporal resolution. To date, the application of OEIPs has been limited to delivery of nonaromatic molecules to mammalian systems, particularly for neuroscience applications. However, many long-standing questions in plant biology remain unanswered due to a lack of technology that precisely delivers plant hormones, based on cyclic alkanes or aromatic structures, to regulate plant physiology...
May 2, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28412057/chemical-characterization-of-biochar-and-assessment-of-the-nutrient-dynamics-by-means-of-preliminary-plant-growth-tests
#14
Munoo Prasad, Nikos Tzortzakis, Nicola McDaniel
Biochar can be produced from several organic sources with varying nutrients and metal concentrations. Four commercial grade biochars were evaluated as peat substitute. Biochars were characterised for plant nutrients and for biological stability. The results showed that there were negligible quantities of N and P and generally high levels of K and high biological stability. When these materials were mixed with peat at 10, 25 and 50% and nutrients were added to bring them to the same level of nutrients as in fertilized peat, it was found that biochar mixtures considerably reduced the levels of calcium chloride/DTPA (CAT) extractable N (including nitrate), P, and electrical conductivity- greater extent with higher rates of biochar addition except for K...
April 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28409201/spontaneous-polyploidization-in-cucumber
#15
Axel O Ramírez-Madera, Nathan D Miller, Edgar P Spalding, Yiqun Weng, Michael J Havey
This is the first quantitative estimation of spontaneous polyploidy in cucumber and we detected 2.2% polyploids in a greenhouse study. We provide evidence that polyploidization is consistent with endoreduplication and is an on-going process during plant growth. Cucumber occasionally produces polyploid plants, which are problematic for growers because these plants produce misshaped fruits with non-viable seeds. In this study, we undertook the first quantitative study to estimate the relative frequency of spontaneous polyploids in cucumber...
April 13, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28398545/evolutionary-dynamics-of-mixed-ploidy-populations-in-an-annual-herb-dispersal-local-persistence-and-recurrent-origins-of-polyploids
#16
Martin Certner, Eliška Fenclová, Pavel Kúr, Filip Kolár, Petr Koutecký, Anna Krahulcová, Jan Suda
Background and Aims: Despite the recent wealth of studies targeted at contact zones of cytotypes in various species, some aspects of polyploid evolution are still poorly understood. This is especially the case for the frequency and success rate of spontaneous neopolyploidization or the temporal dynamics of ploidy coexistence, requiring massive ploidy screening and repeated observations, respectively. To fill this gap, an extensive study of spatio-temporal patterns of ploidy coexistence was initiated in the widespread annual weed Tripleurospermum inodorum (Asteraceae)...
April 7, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28386899/long-term-simulated-nitrogen-deposition-alters-the-plant-cover-dynamics-of-a-mediterranean-rosemary-shrubland-in-central-spain-through-defoliation
#17
Ciro Cabal, Raúl Ochoa-Hueso, María Esther Pérez-Corona, Esteban Manrique
Nitrogen (N) deposition due to anthropogenic pollution is a major driver of the global biodiversity loss. We studied the effect of experimental N and phosphorus (P) fertilization (0, 10, 20, and 50 kg N ha(-1) year(-1) and 14 kg P ha(-1) year(-1) over the background deposition levels) on plant cover dynamics of a rosemary (Rosmarinus officinalis L.) shrubland after 8 years of nutrient addition in a semiarid Mediterranean ecosystem from Central Spain. We specifically aimed at testing whether N deposition has the potential to influence the observed expanding trend of woody vegetation into areas dominated by grassland, biological soil crusts, and bare soil...
April 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28384386/lineages-of-silene-nutans-developed-rapid-strong-asymmetric-postzygotic-reproductive-isolation-in-allopatry
#18
Hélène Martin, Pascal Touzet, Mathilde Dufay, Cécile Godé, Eric Schmitt, Emna Lahiani, Lynda F Delph, Fabienne Van Rossum
Reproductive isolation can rise either as a consequence of genomic divergence in allopatry or as a byproduct of divergent selection in parapatry. To determine whether reproductive isolation in gynodioecious Silene nutans results from allopatric divergence or from ecological adaptation following secondary contact, we investigated the pattern of postzygotic reproductive isolation and hybridization in natural populations using two phylogeographic lineages, western (W1) and eastern (E1). Experimental crosses between the lineages identified strong, asymmetric postzygotic isolation between the W1 and the E1 lineages, independent of geographic overlap...
April 6, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28381077/the-effect-of-silver-and-copper-nanoparticles-on-the-wheat-pseudocercosporella-herpotrichoides-pathosystem
#19
V N Belava, O O Panyuta, G M Yakovleva, Y M Pysmenna, M V Volkogon
The paper covers the study of the effects of silver (Ag) and copper (Cu) nanoparticles on wheat-Pseudocercosporella herpotrichoides pathosystem in general and, separately, on their interaction both with the plant and with the pathogen. Plants, treated with nonionic colloidal solutions of biogenic metal nanoparticles of Ag and Cu, have taken seed treatment as stress and have demonstrated the same changes in the dynamic patterns of thiobarbituric acid reactive substances (TBARS) content as a seedling infection or in its combination with a nanoparticle treatment...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28377775/modeling-allometric-relationships-in-leaves-of-young-rapeseed-brassica-napus-l-grown-at-different-temperature-treatments
#20
Tian Tian, Lingtong Wu, Michael Henke, Basharat Ali, Weijun Zhou, Gerhard Buck-Sorlin
Functional-structural plant modeling (FSPM) is a fast and dynamic method to predict plant growth under varying environmental conditions. Temperature is a primary factor affecting the rate of plant development. In the present study, we used three different temperature treatments (10/14°C, 18/22°C, and 26/30°C) to test the effect of temperature on growth and development of rapeseed (Brassica napus L.) seedlings. Plants were sampled at regular intervals (every 3 days) to obtain growth data during the length of the experiment (1 month in total)...
2017: Frontiers in Plant Science
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