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https://www.readbyqxmd.com/read/28645057/effects-of-salinity-and-short-term-elevated-atmospheric-co2-on-the-chemical-equilibrium-between-co2-fixation-and-photosynthetic-electron-transport-of-stevia-rebaudiana-bertoni
#1
Sayed Hussin, Nicole Geissler, Mervat M M El-Far, Hans-Werner Koyro
The effect of water salinity on plant growth and photosynthetic traits of Stevia rebaudiana was investigated to determine its level and mechanisms of salinity tolerance. It was also attempted to assess how short-term elevated CO2 concentration would influence the boundaries and mechanisms of its photosynthetic capacity. The plants were grown in gravel/hydroponic system under controlled greenhouse conditions and irrigated with four different salinity levels (0, 25, 50 and 100 mol m(-3)NaCl). Low salinity did not significantly alter the plant fresh weight, which was substantially decreased by 67% at high salinity treatment...
June 15, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28643161/nonlinear-biotic-ligand-model-for-assessing-alleviation-effects-of-ca-mg-and-k-on-cd-toxicity-to-soybean-roots
#2
Bo-Ching Chen, Pin-Jie Wang, Pei-Chi Ho, Kai-Wei Juang
Developing a nonlinear biotic ligand model (BLM) that considers the geometrical constraints for binding of different cations on biotic ligands will provide more reliable details about the hypothetical mechanism governing the alleviation of cadmium (Cd) toxicity by coexistent cations. Soybean seedlings under Cd stress produced by various activities of coexistent cations such as calcium (Ca(2+)), magnesium (Mg(2+)), and potassium (K(+)) were hydroponically assayed for Cd toxicity to soybean roots. The Cd(2+) activity resulting in 50% reduction of root elongation (RE), EA 50, was used for assessing the Cd toxicity to the soybean seedling...
June 22, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28641150/polyamine-and-tyramine-involvement-in-nacl-induced-improvement-of-cd-resistance-in-the-halophyte-inula-chrithmoides-l
#3
Rim Ghabriche, Tahar Ghnaya, Mejda Mnasri, Hanen Zaier, Raoudha Baioui, Delphine Vromman, Chedly Abdelly, Stanley Lutts
The aim of the present work was to analyze the impact of salinity on the plant response to Cd toxicity in the Mediterranean halophyte species Inula crithmoides. For this purpose, cuttings were cultivated hydroponically during 21d in the presence of 0, 25 or 50μM CdCl2 combined or not with 0, 100, 200 and 400mM NaCl. The obtained data demonstrated that, in the absence of Cd, NaCl strongly increased plant growth (the maximal dry weight being observed at 100mM) and enhanced the Na(+)/K(+) ratio in the shoot. Cd alone strongly affected plant growth in this halophyte...
June 6, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28639018/test-of-aerobic-tce-degradation-by-willows-salix-viminalis-and-willows-inoculated-with-tce-cometabolizing-strains-of-burkholderia-cepacia
#4
Lauge Peter Westergaard Clausen, Mette Martina Broholm, Ulrich Gosewinkel, Stefan Trapp
Trichloroethylene (TCE) is a widespread soil and groundwater pollutant and clean-up is often problematic and expensive. Phytoremediation may be a cost-effective solution at some sites. This study investigates TCE degradation by willows (S. viminalis) and willows inoculated with three strains of B. cepacia (301C, PR1-31 and VM1330-pTOM), using chloride formation as an indicator of dehalogenation. Willows were grown in non-sterile, hydroponic conditions for 3 weeks in chloride-free nutrient solution spiked with TCE...
June 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28638393/non-chemical-control-of-root-parasitic-weeds-with-biochar
#5
Hanan Eizenberg, Dina Plakhine, Hammam Ziadne, Ludmila Tsechansky, Ellen R Graber
This study tested whether soil-applied biochar can impact the seed germination and attachment of root parasitic weeds. Three hypotheses were evaluated: (i) biochar adsorbs host-exuded signaling molecules; (ii) biochar activates plants' innate system-wide defenses against invasion by the parasite; and (iii) biochar has a systemic influence on the amount of seed germination stimulant produced or released by the host plant. Three types of experiments were performed: (I) pot trials with tomato (Solanum lycopersicum) infested with Phelipanche aegyptiaca PERS...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28637253/synthesis-and-secretion-of-isoflavones-by-field-grown-soybean
#6
Akifumi Sugiyama, Yumi Yamazaki, Shoichiro Hamamoto, Hisabumi Takase, Kazufumi Yazaki
Isoflavones play important roles in rhizosphere plant-microbe interactions. Daidzein and genistein secreted by soybean roots induce the symbiotic interaction with rhizobia and may modulate rhizosphere interactions with microbes. Yet despite their important roles, little is known about the biosynthesis, secretion and fate of isoflavones in field-grown soybeans. Here, we analysed isoflavone contents and the expression of isoflavone biosynthesis genes in field-grown soybeans. In roots, isoflavone contents and composition did not change with crop growth, but the expressions of UGT4, an isoflavone-specific 7-O-glucosyltransferase, and of ICHG (Isoflavone conjugates hydrolysing beta-glucosidase) was decreased during the reproductive stages...
June 16, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28631209/allelopathic-effects-of-exogenous-phenylalanine-a-comparison-of-four-monocot-species
#7
Barbara R Evans, Garima Bali, Art Ragauskas, Riddhi Shah, Hugh O'Neill, Cory Howard, Fayola Lavenhouse, Dawn Ramirez, Kelly Weston, Kelly Ramey, Valerie Cangemi, Brian Kinney, Claudia Partee, Teresa Ware, Brian Davison
Exogenous phenylalanine stunted annual ryegrass but not switchgrass or winter grain rye, with deuterium incorporation up to 3% from phenyalanine-d 8 . Toxicity to duckweed varied with illumination intensity and glucose uptake. Isotopic labeling of biomolecules through biosynthesis from deuterated precursors has successfully been employed for both structural studies and metabolic analysis. Phenylalanine is the precursor of many products synthesized by plants, including the monolignols used for synthesis of lignin...
June 19, 2017: Planta
https://www.readbyqxmd.com/read/28627026/two-nhx-type-transporters-from-helianthus-tuberosus-improve-the-tolerance-of-rice-to-salinity-and-nutrient-deficiency-stress
#8
Yang Zeng, Qing Li, Haiya Wang, Jianliang Zhang, Jia Du, Huimin Feng, Eduardo Blumwald, Ling Yu, Guohua Xu
The NHX-type cation/H(+) transporters in plants have been shown to mediate Na(+) (K(+) )/H(+) exchange for salinity tolerance and K(+) homeostasis. In this study, we identified and characterized two NHX homologues, HtNHX1 and HtNHX2 from an infertile and salinity tolerant species Helianthus tuberosus (cv. Nanyu No.1). HtNHX1 and HtNHX2 share identical 5'- and 3'-UTR and coding regions, except for a 342 bp segment encoding 114 amino acids (L272 to Q385 ) which is absent in HtNHX2. Both hydroponics and soil culture experiments showed that the expression of HtNHX1 or HtNHX2 improved the rice tolerance to salinity...
June 19, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28624590/maleic-acid-assisted-improvement-of-metal-chelation-and-antioxidant-metabolism-confers-chromium-tolerance-in-brassica-juncea-l
#9
Jubayer Al Mahmud, Mirza Hasanuzzaman, Kamrun Nahar, Anisur Rahman, Md Shahadat Hossain, Masayuki Fujita
Chromium (Cr) is a highly toxic environmental pollutant that negatively affects plant growth and development. Thus, remediating Cr from soil or increasing plant tolerance against Cr stress is urgent. Organic acids are recognized as agents of phytoremediation and as exogenous protectants, but using maleic acid (MA) to attain these results has not yet been studied. Therefore, our study investigated the effects of MA on Cr uptake and mitigation of Cr toxicity. We treated 8-d-old Indian mustard (Brassica juncea L...
June 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28623437/root-derived-bicarbonate-assimilation-in-response-to-variable-water-deficit-in-camptotheca-acuminate-seedlings
#10
Sen Rao, Yanyou Wu
Water deficit is one of the key factors that limits the carbon (C) assimilation and productivity of plants. The effect of variable water deficit on recently root-derived bicarbonate assimilation in Camptotheca acuminate seedlings was investigated. Three-month-old seedlings were subjected to three water regimes, well-watered (WW), moderate stress (MS), and severe stress (SS) induced by polyethyleneglycol, in conjunction with relatively high (H) and low (L) natural (13)C-abundance of NaHCO3-labeled treatments in hydroponics for 14 days...
June 16, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28620407/antioxidant-responses-induced-by-uvb-radiation-in-deschampsia-antarctica-desv
#11
Hans Köhler, Rodrigo A Contreras, Marisol Pizarro, Rodrigo Cortés-Antíquera, Gustavo E Zúñiga
Deschampsia antarctica Desv. is one of two vascular plants that live in the Maritime Antarctic Territory and is exposed to high levels of ultraviolet-B (UVB) radiation. In this work, antioxidant physiology of D. antarctica was studied in response to UVB induced oxidative changes. Samples were collected from Antarctica and maintained in vitro culture during 2 years. Plants were sub-cultured in a hydroponic system and exposed to 21.4 kJ m(-2) day(-1), emulating summer Antarctic conditions. Results showed rapid and significant increases in reactive oxygen species (ROS) at 3 h, which rapidly decreased...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28614741/iopromide-exposure-in-typha-latifolia-l-evaluation-of-uptake-translocation-and-different-transformation-mechanisms-in-planta
#12
Hao Cui, Martin Hrabě de Angelis, Peter Schröder
Iopromide is frequently detected in water bodies due to its widespread use as an X-ray contrast agent in medicine. Due to its rapid clearance from the human body and its incomplete removal by wastewater treatment, an elevation of its concentration in the environment is observed that might lead to a serious impact on human and environmental health. Alternative or additional removal technologies may be more effective to remove iopromide from the effluents of wastewater treatment facilities, like phytoremediation with aquatic macrophytes...
June 4, 2017: Water Research
https://www.readbyqxmd.com/read/28613869/effect-of-different-elicitors-and-pre-harvest-day-application-on-the-content-of-phytochemicals-and-antioxidant-activity-of-butterhead-lettuce-lactuca-sativa-var-capitata-produced-under-hydroponic-conditions
#13
Jesus Omar Moreno-Escamilla, Emilio Alvarez-Parrilla, Laura A de la Rosa, José Alberto Núñez-Gastélum, Gustavo A González-Aguilar, Joaquin Rodrigo-Garcia
The effect of four elicitors on phytochemical content in two varieties of lettuce was evaluated. The best pre-harvest day for application of each elicitor was chosen. Solutions of arachidonic acid (AA), salicylic acid (SA), methyl jasmonate (MJ), and Harpin protein (HP) were applied by foliar aspersion on lettuce leaves while cultivated under hydroponic conditions. Application of elicitors was done at 15, 7, 5, 3 or 1 day before harvest. Green lettuce showed the highest increase in phytochemical content when elicitors (AA, SA, and HP) were applied on day 7 before harvest...
June 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28612342/effect-of-glycine-nitrogen-on-lettuce-growth-under-soilless-culture-a-metabolomics-approach-to-identify-the-main-changes-occurred-in-plant-primary-and-secondary-metabolism
#14
Xiao Yang, Lei Feng, Li Zhao, Xiaosong Liu, Danial Hassani, Danfeng Huang
BACKGROUND: Lettuce is a significant source of antioxidants and bioactive compounds. Nitrate is a cardinal fertilizer in horticulture and influences vegetable yield and quality; however, the negative effects of nitrate on the biosynthesis of flavonoids require further study. It is expected that using fertilizers containing organic N could promote the synthesis of health-promoting compounds. RESULTS: Lettuces were hydroponically cultured in media containing 9 mM nitrate or 9 mM glycine for 4 weeks...
June 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28611802/involvement-of-trichoderma-harzianum-epl-1-protein-in-the-regulation-of-botrytis-virulence-and-tomato-defense-related-genes
#15
Eriston V Gomes, Cirano J Ulhoa, Rosa E Cardoza, Roberto N Silva, Santiago Gutiérrez
Several Trichoderma spp. are well known for their ability to: (i) act as important biocontrol agents against phytopathogenic fungi; (ii) function as biofertilizers; (iii) increase the tolerance of plants to biotic and abiotic stresses; and (iv) induce plant defense responses via the production and secretion of elicitor molecules. In this study, we analyzed the gene-regulation effects of Trichoderma harzianum Epl-1 protein during the interactions of mutant Δepl-1 or wild-type T. harzianum strains with: (a) the phytopathogen Botrytis cinerea and (b) with tomato plants, on short (24 h hydroponic cultures) and long periods (4-weeks old plants) after Trichoderma inoculation...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28609737/enantioselective-uptake-translocation-and-degradation-of-the-chiral-pesticides-tebuconazole-and-imazalil-by-phragmites-australis
#16
Tao Lv, Pedro N Carvalho, Mònica Escolà Casas, Ulla E Bollmann, Carlos A Arias, Hans Brix, Kai Bester
Phytoremediation of realistic environmental concentrations (10 μg L(-1)) of the chiral pesticides tebuconazole and imazalil by Phragmites australis was investigated. This study focussed on removal dynamics, enantioselective mechanisms and transformation products (TPs) in both hydroponic growth solutions and plant tissues. For the first time, we documented uptake, translocation and metabolisation of these pesticides inside wetland plants, using enantioselective analysis. Tebuconazole and imazalil removal efficiencies from water reached 96...
June 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28605187/phytotoxicity-study-on-bidens-sulphurea-sch-bip-as-a-preliminary-approach-for-weed-control
#17
Bruna P da Silva, Mariluce P Nepomuceno, Rosa M Varela, Ascensión Torres, José M G Molinillo, Pedro L C A Alves, Francisco A Macías
Farmers of the Franca region in Brazil observed that Bidens sulphurea was able to eliminate the Panicum maximum weed, which infected coffee plantations, without affecting the crop. In an effort to determine if the inhibitory effects observed were due to the presence of phytotoxic compounds from leaves and roots, a biodirected isolation and spectroscopic characterization has been carried out. The leaf dichloromethane and root acetone extracts were the most active, and the former appeared to be more phytotoxic to the target species, including four weeds...
June 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28603945/grafting-response-to-excess-boron-and-expression-analysis-of-genes-coding-boron-transporters-in-tomato
#18
Francesco Di Gioia, Alessio Aprile, Erika Sabella, Pietro Santamaria, Alberto Pardossi, Antonio Miceli, Luigi De Bellis, Eliana Nutricati
Boron (B) is essential for plant growth, however its excess in soil and/or in irrigation water can severely compromise plant growth and yield. The goal of this work was to determine whether grafting onto 'Arnold', a commercial interspecific hybrid (Solanum lycopersicum × S. habrochaites) rootstock, which in a previous study was found to be tolerant to salt stress, could improve tomato (S. lycopersicum L. 'Ikram') tolerance to excess B, and whether this effect is associated with an exclusion mechanism. Non-grafted, self-grafted, and grafted plants were hydroponically grown in a greenhouse with B concentration in the nutrient solution of 0...
June 12, 2017: Plant Biology
https://www.readbyqxmd.com/read/28600794/citric-acid-enhanced-the-antioxidant-defense-system-and-chromium-uptake-by-lemna-minor-l-grown-in-hydroponics-under-cr-stress
#19
Rasham Sallah-Ud-Din, Mujahid Farid, Rashid Saeed, Shafaqat Ali, Muhammad Rizwan, Hafiz Muhammad Tauqeer, Syed Asad Hussain Bukhari
Phytoextraction is a cost-effective and eco-friendly technique for the removal of pollutants, mainly heavy metal(loids) especially from polluted water and metal-contaminated soils. The phytoextraction of heavy metals is, in general, limited due to the low availability of heavy metals in the growth medium. Organic chelators can help to improve the phytoextraction by increasing metal mobility and solubility in the growth medium. The present research was carried out to examine the possibility of citric acid (CA) in improving chromium (Cr) phytoextraction by Lemna minor (duckweed)...
June 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28598215/enhanced-atrazine-removal-by-hydrophyte-bacterium-associations-and-in-vitro-screening-of-the-isolates-for-their-plant-growth-promoting-potential
#20
Anina James, D K Singh, P J Khankhane
Emergent hydrophytes Acorus calamus, Typha latifolia and Phragmites karka and epiphytic root bacteria isolated from their rhizoplanes were exposed to atrazine (5 mg l(-1) and 10 mg l(-1)) individually and in plant‒bacterium combination for 15 days hydroponically. It was observed that A. calamus‒Pseudomonas sp. strain ACB combination was best in decontamination, showing 91% and 87% removal of 5 mg l(-1) and 10 mg l(-1) atrazine. Plant‒bacterium association led to significant increase in atrazine decontamination as compared to decontamination by either plant or bacterium alone indicating synergistic action of the hydrophytes and isolates which led to enhanced atrazine removal...
June 9, 2017: International Journal of Phytoremediation
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