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https://www.readbyqxmd.com/read/28454067/assessment-of-the-swat-model-to-simulate-a-watershed-with-limited-available-data-in-the-pampas-region-argentina
#1
Martín Romagnoli, Margarita Portapila, Alfredo Rigalli, Gisela Maydana, Martín Burgués, Carlos M García
Argentina has been among the world leaders in the production and export of agricultural products since the 1990s. The Carcarañá River Lower Basin (CRLB), a cropland of the Pampas region supplied by extensive rainfall, is located in an area with few streamgauging and other hydrologic/water-quality stations. Therefore, limited hydrologic data are available resulting in limited water-resources assessment. This work explores the application of Soil and Water Assessment Tool (SWAT) model to the CRLB in the Santa Fe province of the Pampas region...
April 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448940/modulation-of-cuo-nanoparticles-toxicity-to-green-pea-pisum-sativum-fabaceae-by-the-phytohormone-indole-3-acetic-acid
#2
Loren Ochoa, Illya A Medina-Velo, Ana C Barrios, Nestor J Bonilla-Bird, Jose A Hernandez-Viezcas, Jose R Peralta-Videa, Jorge L Gardea-Torresdey
The response of plants to copper oxide nanoparticles (nano-CuO) in presence of exogenous phytohormones is unknown. In this study, green pea (Pisum sativum) plants were cultivated to full maturity in soil amended with nano-CuO (10-100nm, 74.3% Cu), bulk-CuO (bCuO, 100-10,000nm, 79.7% Cu), and CuCl2 at 50 and 100mg/kg and indole-3-acetic acid (IAA) at 10 and 100μM. Results showed that IAA at 10 and 100μM, averaged over all Cu treatments, reduced the number of plants by ~23% and ~34%, respectively. IAA at 10μM, nano-CuO at 50mg/kg, b-CuO at 50mg/kg, and CuCl2 at 100mg/kg reduced pod biomass by about 50%...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448589/morpho-physiological-analysis-of-tolerance-to-aluminum-toxicity-in-rice-varieties-of-north-east-india
#3
Jay Prakash Awasthi, Bedabrata Saha, Preetom Regon, Smita Sahoo, Umakanta Chowra, Amit Pradhan, Anupam Roy, Sanjib Kumar Panda
Aluminum (Al) is the third most abundant metal in earth crust, whose chemical form is mainly dependent on soil pH. The most toxic form of Al with respect to plants is Al3+, which exists in soil pH <5. Acidic soil significantly limits crop production mainly due to Al3+ toxicity worldwide, impacting approximately 50% of the world's arable land (in North-Eastern India 80% soil are acidic). Al3+ toxicity in plants ensues root growth inhibition leading to less nutrient and water uptake impacting crop productivity as a whole...
2017: PloS One
https://www.readbyqxmd.com/read/28448168/management-of-textile-wastewater-for-improving-growth-and-yield-of-field-mustard-brassica-campestris-l
#4
Muhammad Yaseen, Muhammad Zahir Aziz, Aqleema Komal, Muhammad Naveed
Disposal of industrial wastewater is a current issue of urbanization. However, this problem can be sorted by using wastewater as alternate source of irrigation after the addition of some amendment. In this way, the problem of disposal of wastewater not only will be resolved but also scarcity of irrigation water can be kept off in future. Current research study was performed to evaluate the influence of different concentration of wastewater along with canal water for enhancing growth and yield of field mustard...
April 27, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28445514/the-complexity-underlying-invasiveness-precludes-the-identification-of-invasive-traits-a-comparative-study-of-invasive-and-non-invasive-heterocarpic-atriplex-congeners
#5
Jana Doudová, Jan Douda, Bohumil Mandák
Heterocarpy enables species to effectively spread under unfavourable conditions by producing two or more types of fruit differing in ecological characteristics. Although it is frequent in annuals occupying disturbed habitats that are vulnerable to invasion, there is still a lack of congeneric studies addressing the importance of heterocarpy for species invasion success. We compared two pairs of heterocarpic Atriplex species, each of them comprising one invasive and one non-invasive non-native congener. In two common garden experiments, we (i) simulated the influence of different levels of nutrients and population density on plants grown from different types of fruits and examined several traits that are generally positively associated with invasion success, and (ii) grew plants in a replacement series experiment to evaluate resource partitioning between them and to compare their competitive ability...
2017: PloS One
https://www.readbyqxmd.com/read/28444952/similarity-in-volatile-communities-leads-to-increased-herbivory-and-greater-tropical-forest-diversity
#6
Tara Joy Massad, Marcílio Martins de Moraes, Casey Philbin, Celso Oliveira, Gerardo Cebrian Torrejon, Lydia Fumiko Yamaguchi, Christopher S Jeffrey, Lee A Dyer, Lora A Richards, Massuo Jorge Kato
A longstanding paradigm in ecology is that there are positive associations between herbivore diversity, specialization, and plant species diversity, with a focus on taxonomic diversity. However, phytochemical diversity is also an informative metric, as insect herbivores interact with host-plants not as taxonomic entities, but as sources of nutrients, primary metabolites, and mixtures of attractant and repellant chemicals. The present research examines herbivore responses to phytochemical diversity measured as volatile similarity in the tropical genus Piper...
April 26, 2017: Ecology
https://www.readbyqxmd.com/read/28443129/maximum-plant-uptakes-for-water-nutrients-and-oxygen-are-not-always-met-by-irrigation-rate-and-distribution-in-water-based-cultivation-systems
#7
Chris Blok, Brian E Jackson, Xianfeng Guo, Pieter H B de Visser, Leo F M Marcelis
Growing on rooting media other than soils in situ -i.e., substrate-based growing- allows for higher yields than soil-based growing as transport rates of water, nutrients, and oxygen in substrate surpass those in soil. Possibly water-based growing allows for even higher yields as transport rates of water and nutrients in water surpass those in substrate, even though the transport of oxygen may be more complex. Transport rates can only limit growth when they are below a rate corresponding to maximum plant uptake...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28443120/dissecting-low-atmospheric-pressure-stress-transcriptome-responses-to-the-components-of-hypobaria-in-arabidopsis
#8
Mingqi Zhou, Jordan B Callaham, Matthew Reyes, Michael Stasiak, Alberto Riva, Agata K Zupanska, Mike A Dixon, Anna-Lisa Paul, Robert J Ferl
Controlled hypobaria presents biology with an environment that is never encountered in terrestrial ecology, yet the apparent components of hypobaria are stresses typical of terrestrial ecosystems. High altitude, for example, presents terrestrial hypobaria always with hypoxia as a component stress, since the relative partial pressure of O2 is constant in the atmosphere. Laboratory-controlled hypobaria, however, allows the dissection of pressure effects away from the effects typically associated with altitude, in particular hypoxia, as the partial pressure of O2 can be varied...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28443069/long-term-enrichment-of-stress-tolerant-cellulolytic-soil-populations-following-timber-harvesting-evidenced-by-multi-omic-stable-isotope-probing
#9
Roland C Wilhelm, Erick Cardenas, Hilary Leung, András Szeitz, Lionel D Jensen, William W Mohn
Soil management is vital for maintaining the productivity of commercial forests, yet the long-term impact of timber harvesting on soil microbial communities remains largely a matter of conjecture. Decomposition of plant biomass, comprised mainly of lignocellulose, has a broad impact on nutrient cycling, microbial activity and physicochemical characteristics of soil. At "Long-term Soil Productivity Study" sites in California dominated by Ponderosa pine, we tested whether clear-cut timber harvesting, accompanied by varying degrees of organic matter (OM) removal, affected the activity and structure of the cellulose-degrading microbial populations 16 years after harvesting...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28443028/improved-model-of-proton-pump-crystal-structure-obtained-by-interactive-molecular-dynamics-flexible-fitting-expands-the-mechanistic-model-for-proton-translocation-in-p-type-atpases
#10
Dorota Focht, Tristan I Croll, Bjorn P Pedersen, Poul Nissen
The plasma membrane H(+)-ATPase is a proton pump of the P-type ATPase family and essential in plants and fungi. It extrudes protons to regulate pH and maintains a strong proton-motive force that energizes e.g., secondary uptake of nutrients. The only crystal structure of a H(+)-ATPase (AHA2 from Arabidopsis thaliana) was reported in 2007. Here, we present an improved atomic model of AHA2, obtained by a combination of model rebuilding through interactive molecular dynamics flexible fitting (iMDFF) and structural refinement based on the original data, but using up-to-date refinement methods...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28442716/a-puccinia-striiformis-f-sp-tritici-secreted-protein-activates-plant-immunity-at-the-cell-surface
#11
Bayantes Dagvadorj, Ahmet Caglar Ozketen, Ayse Andac, Cian Duggan, Tolga Osman Bozkurt, Mahinur S Akkaya
Pathogens secrete effector proteins to suppress host immunity, mediate nutrient uptake and subsequently enable parasitism. However, on non-adapted hosts, effectors can be detected as non-self by host immune receptors and activate non-host immunity. Nevertheless, the molecular mechanisms of effector triggered non-host resistance remain unknown. Here, we report that a small cysteine-rich protein PstSCR1 from the wheat rust pathogen Puccinia striiformis f. sp. tritici (Pst) activates immunity in the non-host solanaceous model plant Nicotiana benthamiana...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28441603/assessment-of-wastewater-treatment-facility-compliance-with-decreasing-ammonia-discharge-limits-using-a-regression-tree-model
#12
Bihu Suchetana, Balaji Rajagopalan, JoAnn Silverstein
A regression tree-based diagnostic approach is developed to evaluate factors affecting US wastewater treatment plant compliance with ammonia discharge permit limits using Discharge Monthly Report (DMR) data from a sample of 106 municipal treatment plants for the period of 2004-2008. Predictor variables used to fit the regression tree are selected using random forests, and consist of the previous month's effluent ammonia, influent flow rates and plant capacity utilization. The tree models are first used to evaluate compliance with existing ammonia discharge standards at each facility and then applied assuming more stringent discharge limits, under consideration in many states...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28441589/nutrient-stress-induced-chromatin-changes-in-plants
#13
REVIEW
David Secco, James Whelan, Hatem Rouached, Ryan Lister
The ability of plants to appropriately respond to the soil nutrient availability is of primary importance for their development and to complete their life cycle. Deciphering these multifaceted adaptive mechanisms remains a major challenge for scientists to date. Recent technological breakthroughs now enable to assess the dynamism and complexity of these processes at unprecedented resolution. In this review, we present some of the most recent findings on the involvement of histone modifications, histone variants and DNA methylation in response to nutrient stresses as well as discussing the potential roles these chromatin changes could serve as priming or as trans-generational stress memory mechanisms...
April 22, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28441554/how-far-are-we-from-closing-the-loop-of-sewage-resource-recovery-a-real-picture-of-municipal-wastewater-treatment-plants-in-italy
#14
Matteo Papa, Paola Foladori, Lorena Guglielmi, Giorgio Bertanza
This paper presents the results of a broad-scale survey of resource recovery implementation in Italian wastewater treatment plants (WWTPs). To the best of our knowledge, this is the first survey comprising a large number of WWTPs done in Europe: more than 600 plants were investigated, representing a treated load of around 20 million population equivalent (≈25% of the total in Italy). Conventional and innovative options for both material and energy recovery along the water and sludge line were surveyed, in order to i) offer a real and complete picture of the current state of resource recovery in WWTPs, and ii) underline key aspects and potential areas for improvements, as a baseline for future developments in the direction of more sustainable plants...
April 22, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28441031/lead-accumulation-and-distribution-in-maize-seedlings-relevance-to-biomass-sproduction-and-metal-phytoextraction
#15
Dmitry I Bashmakov, Alina N Kluchagina, Przemysław Malec, Kazimierz Strzałka, Alexander S Lukatkin
Among trace metals, lead is a highly toxic contaminant, being hazardous to humans and animals. Application of maize plants for phytoremediation of polluted soils and waters has recently been of particular interest. The aim of this work is to investigate the Pb-phytoextraction potential of the maize cv. Tzariza used widely in Eastern European agriculture. Maize seedlings were exposed in a nutrient solution to 0.1 - 10000 µM of Pb2+ for 21 days. Lead accumulated mostly in conductive tissues and shoots at 0...
April 25, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28440077/molecular-dynamics-simulations-of-the-standard-leonardite-humic-acid-microscopic-analysis-of-the-structure-and-dynamics
#16
Drazen Petrov, Daniel Tunega, Martin H Gerzabek, Chris Oostenbrink
Humic substances (HS) are abundant in the environment and play an important role in a number of biogeochemical processes including microbial activity, soil aggregation, plant growth, the retention and release of nutrients, the environmental fate of pollutants and carbon storage. They are flexible, relatively small molecules forming supramolecular structures through weak interactions. Despite the great importance of understanding their behavior at the atomic level, computational modeling, a premier high-resolution technique providing great level of detail, has been surprisingly little employed to study humic substances...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28439863/large-scale-phenotyping-of-root-traits-in-the-model-legume-lotus-japonicus
#17
Marco Giovannetti, Anna Małolepszy, Christian Göschl, Wolfgang Busch
Plants are sessile organisms that can tune their body architecture to the environment. This is very pronounced in their root system. In particular, nutrient availability strongly influences the architecture of the root system; depending on the abundance of specific nutrients, root growth rates and lateral root number are modulated. The extent of these effects is important for plant adaptation and has a major impact on plant fitness. However, the assessment of quantitative effects on a scale large enough for identifying genes and variants using quantitative genetics is difficult, and well-developed methods have been largely restricted to the model species Arabidopsis thaliana...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28439394/seasonal-variation-in-effects-of-herbivory-on-foliar-nitrogen-of-a-threatened-conifer
#18
Robert N Schaeffer, Nicole E Soltis, Jennifer L Martin, Aden L Brown, Sara Gómez, Evan L Preisser, Colin M Orians
Invasive herbivores can dramatically impact the nitrogen (N) economy of native hosts. In deciduous species, most N is stored in stem tissues, while in evergreen conifer species N is stored in needles, making them potentially more vulnerable to herbivory. In eastern forests of the USA, the long-lived, foundational conifer eastern hemlock (Tsuga canadensis) is under the threat of extirpation by the invasive hemlock woolly adelgid (HWA: Adelges tsugae). We assessed the impact of HWA infestation on the patterns of seasonal foliar N availability in hemlock planted in a deciduous forest understory...
March 2017: AoB Plants
https://www.readbyqxmd.com/read/28439279/metabolic-investigation-of-phelipanche-aegyptiaca-reveals-significant-changes-during-developmental-stages-and-in-its-different-organs
#19
Noam Nativ, Yael Hacham, Joseph Hershenhorn, Evgenia Dor, Rachel Amir
Phelipanche aegyptiaca Pers. is a root holoparasitic plant considered to be among the most destructive agricultural weeds worldwide. In order to gain more knowledge about the metabolic profile of the parasite during its developmental stages, we carried out primary metabolic and lipid profiling using GC-MS analysis. In addition, the levels of amino acids that incorporate into proteins, total protein in the albumin fraction, nitrogen, reduced sugars, and phenols were determined. For the assays, the whole plants from the four developmental stages-tubercle, pre-emergent shoot, post-emergent shoot, and mature flowering plants-were taken...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28439083/a-novel-way-to-establish-fertilization-recommendations-based-on-agronomic-efficiency-and-a-sustainable-yield-index-for-rice-crops
#20
Chuang Liu, Yi Liu, Zhiguo Li, Guoshi Zhang, Fang Chen
A simpler approach for establishing fertilizer recommendations for major crops is urgently required to improve the application efficiency of commercial fertilizers in China. To address this need, we developed a method based on field data drawn from the China Program of the International Plant Nutrition Institute (IPNI) rice experiments and investigations carried out in southeastern China during 2001 to 2012. Our results show that, using agronomic efficiencies and a sustainable yield index (SYI), this new method for establishing fertilizer recommendations robustly estimated the mean rice yield (7...
April 24, 2017: Scientific Reports
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