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https://www.readbyqxmd.com/read/29156306/effect-of-microcystins-on-root-growth-oxidative-response-and-exudation-of-rice-oryza-sativa
#1
Qing Cao, Richard R Rediske, Lei Yao, Liqiang Xie
A 30 days indoor hydroponic experiment was carried out to evaluate the effect of microcystins (MCs) on rice root morphology and exudation, as well as bioaccumulation of MCs in rice. MCs were bioaccumulated in rice with the greatest concentrations being observed in the leaves (113.68μgg(-1) Fresh weight (FW)) when exposed to 500μgL(-1) MCs. Root activity at 500μgL(-1) decreased 37%, compared to the control. MCs also induced disruption of the antioxidant system and lipid peroxidation in rice roots. Root growth was significantly inhibited by MCs...
November 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29154113/responses-of-hydrilla-verticillata-l-f-royle-and-vallisneria-natans-lour-hara-to-glyphosate-exposure
#2
Guidi Zhong, Zhonghua Wu, Jun Yin, Lulu Chai
Glyphosate is a broad-spectrum herbicide that is frequently detected in water bodies and is harmful to aquatic systems. We conducted an experiment to explore the ecological sensitivity of Hydrilla verticillata (L.f.) Royle and Vallisneria natans (Lour.) Hara to glyphosate. Our research focused on the physiological responses of H. verticillata and V. natans after exposure to various concentrations of glyphosate (0, 1, 10, 20, 30, 40, 50 and 80 mg/L) in hydroponic culture after one day (1D) and seven days (7D)...
November 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/29150559/a-program-for-iron-economy-during-deficiency-targets-specific-fe-proteins
#3
Laura J Hantzis, Gretchen E Kroh, Courtney E Jahn, Michael Cantrell, Graham Peers, Marinus Pilon, Karl Ravet
Iron (Fe) is an essential element for plants, utilized in nearly every cellular process. Because the adjustment of uptake under Fe limitation cannot satisfy all demands, plants need to acclimate their physiology and biochemistry, especially in their chloroplasts, which have a high demand for Fe. To investigate if a program exists for the utilization of Fe under deficiency, we analyzed how hydroponically grown Arabidopsis thaliana adjusts its physiology and Fe protein composition in vegetative photosynthetic tissue, during Fe deficiency...
November 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29149563/zein-nanoparticles-uptake-by-hydroponically-grown-soybean-plants
#4
Kurt Ristroph, Carlos E Astete, Ede Bodoki, Cristina M Sabliov
In the interest of developing and characterizing a polymeric nanoparticle pesticide delivery vehicle to soybeans, zein nanoparticle (ZNP) uptake by the roots and biodistribution to the leaves of soybean plants was measured. Zein was tagged with fluorescein isothiocyanate (FITC) and made into nanoparticles (135±3 nm diameter. 0.202±0.034 PDI and 81±4 mV zeta-potential at pH 6) using an emulsion-diffusion method. After ten days of hydroponic exposure, association between particles and roots of plants was found to vary based on bulk nanoparticle concentration...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29148171/identification-and-expression-profiling-of-pht1-phosphate-transporters-in-wheat-in-controlled-environments-and-in-the-field
#5
A Grün, P Buchner, M R Broadley, M J Hawkesford
Phosphorus (P) is an important macronutrient with critical functions in plants. Phosphate (Pi) transporters which mediate Pi acquisition and Pi translocation within the plant are key factors in Pi deficiency responses. However, their relevance for adaptation to long-term Pi limitation under agronomic conditions, particularly in wheat, remains unknown. Here, we describe the identification of the complete Pi transporter gene family (Pht1) in wheat (Triticum aestivum). Gene expression profiles were compared for hydroponic and field-grown plant tissues of wheat at multiple developmental stages...
November 17, 2017: Plant Biology
https://www.readbyqxmd.com/read/29140437/metabolite-profiling-at-the-cellular-and-subcellular-level-reveals-metabolites-associated-with-salinity-tolerance-in-sugar-beet
#6
M Sazzad Hossain, Marcus Persicke, Abdelaleim Ismail ElSayed, Jörn Kalinowski, Karl-Josef Dietz
Sugar beet is among the most salt-tolerant crops. This study aimed to investigate the metabolic adaptation of sugar beet to salt stress at the cellular and subcellular levels. Seedlings were grown hydroponically and subjected to stepwise increases in salt stress up to 300 mM NaCl. Highly enriched fractions of chloroplasts were obtained by non-aqueous fractionation using organic solvents. Total leaf metabolites and metabolites in chloroplasts were profiled at 3 h and 14 d after reaching the maximum salinity stress of 300 mM NaCl...
November 11, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29138971/carbon-source-sink-relationship-in-arabidopsis-thaliana-the-role-of-sucrose-transporters
#7
Mickaël Durand, Dany Mainson, Benoît Porcheron, Laurence Maurousset, Rémi Lemoine, Nathalie Pourtau
The regulation of source-to-sink sucrose transport is associated with AtSUC and AtSWEET sucrose transporters' gene expression changes in plants grown hydroponically under different physiological conditions. Source-to-sink transport of sucrose is one of the major determinants of plant growth. Whole-plant carbohydrates' partitioning requires the specific activity of membrane sugar transporters. In Arabidopsis thaliana plants, two families of transporters are involved in sucrose transport: AtSUCs and AtSWEETs...
November 14, 2017: Planta
https://www.readbyqxmd.com/read/29131608/metabolism-and-photolysis-of-2-4-dinitroanisole-in-arabidopsis
#8
Hunter W Schroer, Xueshu Li, Hans-Joachim Lehmler, Craig L Just
New insensitive munitions explosives, including 2,4-dinitroanisole (DNAN), are replacing traditional explosive compounds to protect soldiers and simplify transport logistics. Despite the occupational safety benefits of these new explosives, feasible strategies for cleaning up DNAN from soil and water have not been developed. Here, we evaluate the metabolism of DNAN by the model plant Arabidopsis to determine whether phytoremediation can be used to clean up contaminated sites. Furthermore, we evaluate the role of photodegradation of DNAN and its plant metabolites within Arabidopsis leaves to determine the potential impact of photolysis on the phytoremediation of contaminants...
November 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29127920/uptake-and-phytotoxic-effect-of-benzalkonium-chlorides-in-lepidium-sativum-and-lactuca-sativa
#9
Adnan Hossain Khan, Mark Libby, Daniel Winnick, John Palmer, Mark Sumarah, Madhumita B Ray, Sheila M Macfie
Cationic surfactants such as benzalkonium chlorides (BACs) are used extensively as biocides in hospitals, food processing industries, and personal care products. BACs have the potential to reach the rooting zone of crop plants and BACs might thereby enter the food chain. The two most commonly used BACs, benzyl dimethyl dodecyl ammonium chloride (BDDA) and benzyl dimethyl tetradecyl ammonium chloride (BDTA), were tested in a hydroponic system to assess the uptake by and phytotoxicity to lettuce (Lactuca sativa L...
November 8, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29127816/comparative-study-on-the-effects-of-putrescine-and-spermidine-pre-treatment-on-cadmium-stress-in-wheat
#10
Judit Tajti, Tibor Janda, Imre Majláth, Gabriella Szalai, Magda Pál
In several cases a correlation was found between polyamines and abiotic stress tolerance. However, the individual polyamines may have different effects, which also vary depending on the type of treatment. When applied as seed soaking or added hydroponically 0.5mM putrescine and spermidine, different changes were induced during 50µM cadmium stress in wheat plants. Seed-soaked plants were exposed to cadmium immediately after germination for 5 days, while plants pre-treated with polyamines hydroponically were stressed at age of 14 days for 7 days...
November 8, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29125288/uptake-translocation-and-biotransformation-of-organophosphorus-esters-in-wheat-triticum-aestivum-l
#11
Weining Wan, Honglin Huang, Jitao Lv, Ruixia Han, Shuzhen Zhang
The uptake, translocation and biotransformation of organophosphate esters (OPEs) by wheat (Triticum aestivum L.) were investigated by a hydroponic experiment. The results demonstrated that OPEs with higher hydrophobicity were more easily taken up by roots, and OPEs with lower hydrophobicity were more liable to be translocated acropetally. A total of 43 metabolites including dealkylated, oxidatively dechlorinated, hydroxylated, methoxylated, and glutathione- and glucuronide- conjugated products were detected derived from eight OPEs, with di-esters formed by direct dealkylation from the parent tri-esters as the major products, followed with hydroxylated tri-esters...
November 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29123537/association-mapping-of-ferrous-zinc-and-aluminum-tolerance-at-the-seedling-stage-in-indica-rice-using-magic-populations
#12
Lijun Meng, Baoxiang Wang, Xiangqian Zhao, Kimberly Ponce, Qian Qian, Guoyou Ye
Excessive amounts of metal are toxic and severely affect plant growth and development. Understanding the genetic control of metal tolerance is crucial to improve rice resistance to Fe, Zn, and Al toxicity. The multi-parent advanced generation inter-cross (MAGIC) populations were genotyped using a 55 K rice SNP array and screened at the seedling stage for Fe, Zn, and Al toxicity using a hydroponics system. Association analysis was conducted by implementing a mixed linear model (MLM) for each of the five MAGIC populations double cross DC1 (founders were SAGC-08, HHZ5-SAL9-Y3-Y1, BP1976B-2-3-7-TB-1-1, PR33282-B-8-1-1-1-1-1), double cross DC2 (founders of double cross were FFZ1, CT 16658-5-2-2SR-2-3-6MP, IR 68, IR 02A127), eight parents population 8way (founders were SAGC-08, HHZ5-SAL9-Y3-Y1, BP1976B-2-3-7-TB-1-1, PR33282-B-8-1-1-1-1-1, FFZ1, CT 16658-5-2-2SR-2-3-6MP, IR 68, IR 02A127), DC12 (DC1+DC2) and rice multi-parent recombinant inbred line population RMPRIL (DC1+DC2+8way)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29121576/soil-geochemical-factors-regulate-cd-accumulation-by-metal-hyperaccumulating-noccaea-caerulescens-j-presl-c-presl-f-k-mey-in-field-contaminated-soils
#13
Carla E Rosenfeld, Rufus L Chaney, Carmen E Martínez
Cadmium contamination in soil is a substantial global problem, and of significant concern due to high food-chain transfer. Cadmium hyperaccumulators are of particular interest because of their ability to tolerate and take up significant amounts of heavy metal pollution from soils. One particular plant, Noccaea caerulescens (formerly, Thlaspi caerulescens), has been extensively studied in terms of its capacity to accumulate heavy metals (specifically Zn and Cd), though these studies have primarily utilized hydroponic and metal-spiked model soil systems...
November 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29115942/detection-of-qtls-for-seedling-characteristics-in-barley-hordeum-vulgare-l-grown-under-hydroponic-culture-condition
#14
Qifei Wang, Genlou Sun, Xifeng Ren, Jibin Wang, Binbin Du, Chengdao Li, Dongfa Sun
BACKGROUND: Seedling characteristics play significant roles in the growth and development of barley (Hordeum vulgare L.), including stable stand establishment, water and nutrients uptake, biotic resistance and abiotic stresses, and can influence yield and quality. However, the genetic mechanisms underlying seedling characteristics in barley are largely unknown and little research has been done. In the present work, 21 seedling-related characteristics are assessed in a barley double haploid (DH) population, grown under hydroponic conditions...
November 7, 2017: BMC Genetics
https://www.readbyqxmd.com/read/29112921/a-novel-fungal-arsenic-methyltransferase-waarsm-reduces-grain-arsenic-accumulation-in-transgenic-rice-oryza-sativa-l
#15
Shikha Verma, Pankaj Kumar Verma, Alok Kumar Meher, Amit Kumar Bansiwal, Rudra Deo Tripathi, Debasis Chakrabarty
Rice (Oryza sativa L.) grown on arsenic-containing soil and water become a primary dietary source of arsenic and pose a significant health risk. Gene modification is an important and practical approach to reduce arsenic accumulation in rice grains. Here, we reported a WaarsM gene of soil fungus Westerdykella aurantiaca, expressed in rice able to convert toxic inorganic arsenicals to methylated arsenic species, therefore, reduce arsenic accumulation in rice grains. In response to arsenic treatment in hydroponics, WaarsM expressing transgenic lines showed a marked increase in arsenic resistance and reduces its accumulation compared to NT...
October 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29106782/expression-and-assembly-of-largest-foreign-protein-in-chloroplasts-oral-delivery-of-human-fviii-made-in-lettuce-chloroplasts-robustly-suppresses-inhibitor-formation-in-hemophilia-a-mice
#16
Kwang-Chul Kwon, Alexandra Sherman, Wan-Jung Chang, Aditya Kamesh, Moanaro Biswas, Roland W Herzog, Henry Daniell
Inhibitor formation is a serious complication of factor VIII (FVIII) replacement therapy for the X-linked bleeding disorder hemophilia A and occurs in 20-30% of patients. No prophylactic tolerance protocol currently exists. Although we reported oral tolerance induction using FVIII domains expressed in tobacco chloroplasts, significant challenges in clinical advancement include expression of the full-length CTB-FVIII sequence to cover the entire patient population, regardless of individual CD4(+) T cell epitope responses...
November 6, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/29103085/feasibility-assessment-application-of-ecological-floating-beds-for-polluted-tidal-river-remediation
#17
Shaoling Sun, Yanqing Sheng, Guoqiang Zhao, Zhaoran Li, Jian Yang
The remediation of polluted coastal rivers is a global challenge in the environmental field. The objective of this study was to investigate the remediation feasibility of a high-salinity river using water spinach (WS) and sticky rice (SR) in hydroponic floating-bed systems. In this study, the total nitrogen (TN) removal rates were 89.7, 92.3, 85.1, and 75.2% in the WS floating-bed system and 81.2 and 78.9% in the SR floating-bed system under different salinities (2-31 psu). Additionally, the total phosphorus (TP) removal rates were 94...
November 4, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29102904/root-uptake-and-shoot-accumulation-of-cadmium-by-lettuce-at-various-cd-zn-ratios-in-nutrient-solution
#18
A A Zare, A H Khoshgoftarmanesh, M J Malakouti, H A Bahrami, R L Chaney
Cadmium (Cd) is toxic to animals and humans after it accumulates over decades in the kidney cortex. Food crops grown in Cd-contaminated soils are the primary sources of excessive Cd entry into humans. Although plant available Zn concentration in soil is an important factor which can greatly reduce Cd uptake by plant roots and its translocation into the edible parts, Cd:Zn ratio is suggested to be a more important factor in comparison with Zn concentration alone in determining Cd uptake by plants. In the present study, the physiological mechanisms of Cd absorption by roots and its translocation to leaves of lettuce (Lactuca sativa L...
November 2, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29101886/influence-of-aspartic-acid-and-lysine-on-the-uptake-of-gold-nanoparticles-in-rice
#19
Xinxin Ye, Hongying Li, Qingyun Wang, Rushan Chai, Chao Ma, Hongjian Gao, Jingdong Mao
The interactions between plants and nanomaterials (NMs) can shed light on the environmental consequences of nanotechnology. We used the major crop plant rice (Oryza sativa L.) to investigate the uptake of gold nanoparticles (GNPs) coated with either negatively or positively charged ligands, over a 5-day period, in the absence or presence of one of two amino acids, aspartic acid (Asp) or lysine (Lys), acting as components of rice root exudates. The presence of Asp or Lys influenced the uptake and distribution of GNPs in rice, which depended on the electrical interaction between the coated GNPs and each amino acid...
November 1, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29101278/altered-expression-of-a-malate-permeable-anion-channel-osalmt4-disrupts-mineral-nutrition
#20
Jie Liu, Meixue Zhou, Emmanuel Delhaize, Peter R Ryan
Aluminium-activated malate transporters (ALMT) form a family of anions channels in plants but little is known about most of its members. This study examined the function of OsALMT4 from rice (Oryza sativa L.). We show that OsALMT4 is expressed in roots and shoots and the OsALMT4 protein localizes to the plasma membrane. Transgenic rice lines over-expressing (OX) OsALMT4 released malate from the roots constitutively and had two-fold higher malate concentrations in the xylem sap than nulls indicating greater concentrations of malate in the apoplast...
November 3, 2017: Plant Physiology
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