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Junliang Xin, Baifei Huang
The objectives of this study were to identify genotypic differences in the uptake and translocation of boron (B) in vetiver (Chrysopogon zizanioides L.), a promising species in B phytoremediation, and to determine the efficiency of vetiver floating island system in B phytoremediation. Changes in plant biomass and B uptake and translocation were determined in two vetiver genotypes, Sierra and Sunshine, cultured hydroponically in a nutrient solution and exposed to six different B concentrations for 7 d and 14 d...
July 3, 2018: International Journal of Phytoremediation
Yanliang Wang, Erik Lysøe, Tegan Armarego-Marriott, Alexander Erban, Lisa Paruch, Andre van Eerde, Ralph Bock, Jihong Liu-Clarke
Root and root-released organic anions play important roles in uptake of phosphorus (P), an essential macronutrient for food production. Oat, ranking sixth in the world's cereal production, contains valuable nutritional compounds and can withstand poor soil conditions. Our aim was to investigate root transcriptional and metabolic responses of oat grown under P-deficient and P-sufficient conditions. We conducted a hydroponic experiment and measured root morphology and organic anion exudation, and analysed changes in the transcriptome and metabolome...
May 11, 2018: Journal of Experimental Botany
Rongli Shi, Michael Melzer, Shaojian Zheng, Andreas Benke, Benjamin Stich, Nicolaus von Wirén
Antagonistic interactions of phosphorus (P) hamper iron (Fe) acquisition by plants and can cause Fe deficiency-induced chlorosis. To determine the physiological processes underlying adverse Fe-P interactions, the maize lines B73 and Mo17, which differ in chlorosis susceptibility, were grown hydroponically at different Fe:P ratios. In the presence of P, Mo17 became more chlorotic than B73. The higher sensitivity of Mo17 to Fe deficiency was not related to Fe-P interactions in leaves but to lower Fe translocation to shoots, which coincided with a larger pool of Fe being fixed in the root apoplast of P-supplied Mo17 plants...
2018: Frontiers in Plant Science
Zhandong Cai, Yanbo Cheng, Peiqi Xian, Qibin Ma, Ke Wen, Qiuju Xia, Gengyun Zhang, Hai Nian
Map-based cloning identified GmHAD1, a gene which encodes a HAD-like acid phosphatase, associated with soybean tolerance to low phosphorus stress. Phosphorus (P) deficiency in soils is a major limiting factor for crop growth worldwide. Plants may adapt to low phosphorus (LP) conditions via changes to root morphology, including the number, length, orientation, and branching of the principal root classes. To elucidate the genetic mechanisms for LP tolerance in soybean, quantitative trait loci (QTL) related to root morphology responses to LP were identified via hydroponic experiments...
May 12, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Cheng Xu, Hongwei Zhang, Jianhao Sun, Zifeng Guo, Cheng Zou, Wen-Xue Li, Chuanxiao Xie, Changling Huang, Ruineng Xu, Hong Liao, Jinxiang Wang, Xiaojie Xu, Shanhong Wang, Yunbi Xu
Phosphorus deficiency in soil is a worldwide constraint threatening maize production. Through a genome-wide association study, we identified molecular markers and associated candidate genes and molecular pathways for low-phosphorus stress tolerance. Phosphorus deficiency in soils will severely affect maize (Zea mays L.) growth and development, thus decreasing the final yield. Deciphering the genetic basis of yield-related traits can benefit our understanding of maize tolerance to low-phosphorus stress. However, considering that yield-related traits should be evaluated under field condition with large populations rather than under hydroponic condition at a single-plant level, searching for appropriate field experimental sites and target traits for low-phosphorus stress tolerance is still very challenging...
May 12, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Qing Huang, Qing Liu, Lina Lin, Fang-Jun Li, Yifan Han, Zheng-Guo Song
In this study, we investigated arsenic uptake and enzymatic activities in rice seedlings after the addition of nanoparticles. Hydroponic experiments were conducted to investigate the effects of different nanomaterials (high-quality graphene oxide, multilayer graphene oxide, 20 nm hydroxyapatite (HA20 ), 40 nm hydroxyapatite (HA40 ), nano-Fe3 O4 (nFe3 O4 ) and nano-zerovalent iron [nFe]) on the biomass, arsenic uptake, and enzyme activities in seedlings of the rice cultivars T705 and X24. Compared with the control, the addition of different nanomaterials increased seedling growth, with X24 rice growing better than T705 rice...
May 10, 2018: Ecotoxicology and Environmental Safety
Alice Hazotte, Olivier Péron, Pierre Gaudin, Abdesselam Abdelouas, Thierry Lebeau
With the aim of improving the phytoextraction rate of cesium (Cs), the effect of Pseudomonas fluorescens ATCC 17400 and its siderophore pyoverdine (PVD) on the uptake of Cs by red clover was studied in soil pots. This work also provides a mechanistic understanding of the Cs-bacteria (or PVD)-illite-plant interactions by using a simplified experimental design, i.e., hydroponics with either Cs in solution or Cs-spiked illite in suspension. For soil spiked with 11.2 mmol kg-1 (1480 mg kg-1 ) of Cs, 0.43% of total Cs was taken up by red clover in 12 days (119 μmol g-1 (16 mg g-1 ) of Cs dry matter in roots and 40 μmol g-1 (5 mg g-1 ) in shoots)...
May 12, 2018: Environmental Science and Pollution Research International
Rahma Goussi, Arafet Manaa, Walid Derbali, Simone Cantamessa, Chedly Abdelly, Roberto Barbato
Salinity is one of the most important abiotic stress affecting plant growth and productivity worldwide. Photosynthesis, together with cell growth, is among the primary process affected by salinity. Here, we report the effects of salt stress on photosynthesis in the model halophyte Thellungiella salsuginea. Plants were grown in hydroponic system and then treated for 2 weeks with different NaCl concentrations (0, 100, 200 and 400 mM). Leaf analysis using both photonic and transmission electron microscopes showed some changes in mesophyll cell organization, including shape and dimension...
May 2, 2018: Journal of Photochemistry and Photobiology. B, Biology
Skhawat Ali, Rong Jin, Rafaqat A Gill, Theodore M Mwamba, Na Zhang, Zaid Ul Hassan, Faisal Islam, Shafaqat Ali, Weijun Zhou
Beryllium (Be) could be a threatening heavy metal pollutant in the agroecosystem that may severely affect the performance of crops. The present study was conducted to evaluate the toxic effects of Be (0, 100, 200, and 400  μ M) on physiological, ultrastructure, and biochemical attributes in hydroponically grown six-day-old seedlings of two cultivars of Brassica napus L., one tolerant (ZS 758, black seeded) and one sensitive (Zheda 622, yellow seeded). Higher Be concentrations reduced the plant growth, biomass production, chlorophyll contents, and the total soluble protein contents...
2018: BioMed Research International
Wenjie Ren, Haiwei Chang, Yuting Wang, Ying Teng, Wenting Ma, Yongming Luo
Graphene may affect fate of organic contaminants due to its strong adsorption properties, which is very crucial for accurately assessing ecological risk of graphene and concurrent contaminants, while the current information remains largely unknown. Here, we firstly explored the adsorption characteristics of sulfonated graphene (SG) for a widespread polychlorinated biphenyl 2,4,4'-trichlorobiphenyl (PCB28) (0.5-100 μg L-1 ). Subsequently, the influence of SG on the uptake, translocation, and metabolism of PCB28 in maize seedlings was investigated through hydroponic exposure experiment...
May 10, 2018: Environmental Science and Pollution Research International
Souhir Abdelkrim, Salwa H Jebara, Omar Saadani, Manel Chiboub, Ghassen Abid, Moez Jebara
In search of efficient and resistant plant growth-promoting rhizobacteria (PGPR) strains with multiple activities, a total of twelve bacterial belonging to R. leguminosarum, S. meliloti, Pseudomonas sp., P. fluorescens, Luteibacter sp., Variovorax sp., B. simplex, and B. megaterium were isolated from root nodules of grass pea (Lathyrus sativus L.) grown in contaminated soils. Upon screening, all test strains were able to synthesize indoleacetic acid; more than 90% were siderophore producers and 75% showed varying levels of phosphate solubilizing ability...
May 8, 2018: Journal of Basic Microbiology
Yini Cao, Ying Zhang, Chuanxin Ma, Haimei Li, Jianfeng Zhang, Guangcai Chen
Selecting plant species, especially woody species, that can tolerate and accumulate high levels of heavy metals is crucial for the purpose of phytoremediation. In the present study, seven willow species/clones were evaluated for their variations in copper (Cu) tolerance, Cu accumulation, and their relative physiological responses, when exposed to different doses of Cu (control, 15, and 120 μM) in a hydroponic system for 40 days. Upon Cu exposure, all tested willow species/clones (Salix, S.) remained relative normal growth, albeit with some visual evidence of Cu toxicity observed...
May 8, 2018: Environmental Science and Pollution Research International
Juanni Chen, Liang Yang, Shili Li, Wei Ding
An increasing number of investigations have been performed on the phytotoxicity of carbon-based nanomaterials duo to their extensive use in various fields. In the present study, we investigated the phytotoxicity of unfunctionalized graphene oxide (GO) and amine-functionalized graphene oxide (G-NH₂) on wheat ( Triticum aestivum ) in the concentration range from 125 to 2000 μg/mL after 9 days of hydroponic culture. Our results found that the incubation with both nanomaterials did not affect the final seed germination rate, despite some influence in the initial stage...
May 7, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Antonios Chrysargyris, Evgenia Michailidi, Nikos Tzortzakis
Saline water has been proposed as a solution to partially cover plant water demands due to scarcity of irrigation water in hot arid areas. Lavender ( Lavandula angustifolia Mill.) plants were grown hydroponically under salinity (0-25-50-100 mM NaCl). The overcome of salinity stress was examined by K, Zn, and Si foliar application for the plant physiological and biochemical characteristics. The present study indicated that high (100 mM NaCl) salinity decreased plant growth, content of phenolics and antioxidant status and essential oil (EO) yield, while low-moderate salinity levels maintained the volatile oil profile in lavender...
2018: Frontiers in Plant Science
Nimisha Edayilam, Dawn A Montgomery, Brennan O Ferguson, Amith Sadananda Maroli, Nicole Martinez, Brian A Powell, Nishanth Tharayil
Apparent deficiency of soil mineral nutrients often triggers specific physio-morphological changes in plants, and some of these changes could also inadvertently increase the ability of plants to mobilize radionuclides from stable mineral forms. This work, through a series of sand-culture, hydroponics and batch-equilibration experiments, investigated the differential ability of root exudates of Andropogon virginicus grown under conditions with variable phosphorus (P) availability (KH2 PO4 , FePO4 , Ca3 (PO4 )2 , and no P) to solubilize uranium (U) from the uranyl phosphate mineral Chernikovite...
May 3, 2018: Environmental Science & Technology
Wen Jing Nie, Shuo Shuo Wang, Xin Jing, Biao Gong, Min Wei, Feng Juan Yang, Yan Li, Qing Hua Shi
The effects of 0.2 μmol·L-1 exogenous 2,4-epibrassinolide (EBR) on the growth and reactive oxygen species metabolism of cucumber seedlings ('Jinyan 4' cucumber) under salt-alkaline stress (30 mmol·L-1 NaHCO3 ) were examined by hydroponics method. The results showed that NaHCO3 stress significantly induced production of O2 -· and accumulation of H2 O2 in leaves and roots, resulting in the increases of MDA content and electrolyte leakage. Under NaHCO3 stress, activities of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, dehydroascorbatereductase, monodehydrodroascorbate reductase, and glutathione reductase as well as contents of ascorbic acid and glutathione were firstly increased and then decreased with progress of stress time...
March 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Haiming Wu, Yina Zou, Jialong Lv, Zhen Hu
Aquaponics as a potential alternative for conventional aquaculture industry has increasingly attracted worldwide attention in recent years. However, the sustainable application of aquaponics is facing a growing challenge. In particular, there is a pressing need to better understand and control the accumulation of dissolved organic matter (DOM) in aquaponics with the aim of optimizing nitrogen utilization efficiency. This study was aiming for assessing the characteristics of DOM in the culture water and the relationship with the nitrogen transformations in different intensified aquaponic systems with hydroponic aeration supplement and polylactic acid (PLA) addition...
April 18, 2018: Chemosphere
Lawrence Mzukisi Madikizela, Somandla Ncube, Luke Chimuka
Sizeable amount of research has been conducted on the possible uptake of pharmaceuticals by plants from contaminated soil and water used for irrigation of crops. In most cases, pharmaceuticals are taken by roots and translocated into various tissues by transpiration and diffusion. Due to the plant uptake, the occurrence of pharmaceuticals in food sources such as vegetables is a public concern. Few review papers focusing on the uptake of pharmaceuticals, in particular antibiotics, and their translocation in plant tissues have been published...
April 27, 2018: Science of the Total Environment
Aline Soares Pereira, Athos Odin Severo Dorneles, Katieli Bernardy, Victória Martini Sasso, Daniele Bernardy, Gessieli Possebom, Liana Veronica Rossato, Valderi Luiz Dressler, Luciane Almeri Tabaldi
Cadmium (Cd) is toxic to plants and animals, making it necessary to develop strategies that seek to reduce its introduction into food chains. Thus, the aim of this study was to investigate whether silicon (Si) and selenium (Se) reduce Cd concentrations in Pfaffia glomerata medicinal plant and attenuate the oxidative stress promoted by this metal. These plants were cultivated in hydroponics under the following treatments: control (nutrient solution), 2.5 μM Se, 2.5 mM Si, 50 μM Cd, 50 μM Cd + 2.5 μM Se, 50 μM Cd + 2...
April 26, 2018: Environmental Science and Pollution Research International
Lili Zhang, Guangjie Li, Yilin Li, Ju Min, Herbert J Kronzucker, Weiming Shi
Agronomic performance of transgenic tomato overexpressing functional genes has rarely been investigated in the field. In an attempt to improve low-phosphate (P) stress tolerance of tomato (Solanum lycopersicum) plants and promote tomato fruit production in the field, an expression vector containing cDNA to an Arabidopsis 14-3-3 protein, General Regulatory Factor 9 (GRF9), driven by a cauliflower mosaic virus 35S promoter, was transferred into tomato plants. Transgenic expression of GRF9 was ascertained by quantitative real-time PCR analysis...
April 17, 2018: Journal of Plant Physiology
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