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Min Liu, Fanzhen Xu, Xingliang Xu, Wolfgang Wanek, Xiaodong Yang
Several studies have explored plant nutrient acquisition during ecosystem succession, but it remains unclear how age affects nitrogen (N) acquisition by the same tree species. Clarifying the age effect will be beneficial to fertilization management through improving N-use efficiency and reducing the risk of environmental pollution due to NO3- leaching. To clarify the effect of age on N uptake, rubber (Hevea brasiliensis (Willd. ex A. Juss.) Muell. Arg.) plantations of five ages (7, 16, 24, 32 and 49 years) were selected in Xishuangbanna of southern China for brief 15N exposures of intact roots using field hydroponic experiments...
April 5, 2018: Tree Physiology
Qinchun Li, Hongbin Wang, Haijuan Wang, Wen Zheng, Dongmo Wu, Zhongzhen Wang
Cytokinins (CTKs) are effective in alleviating abiotic stresses on plants, but little information is available regarding the effects of CTKs on arsenic (As) accumulation and changes of chloroplast ultrastructure in plants with different As-accumulating ability. Here a hydroponic experiment was designed to evaluate the effects of different concentration of kinetin (KT, 0-40 mg/L) on growth and chloroplast ultrastructure of As hyperaccumulator Pteris cretica var. nervosa and non-hyperaccumulator Pteris ensiformis treated by 5 mg/L arsenate for 14 days...
April 12, 2018: Ecotoxicology and Environmental Safety
Susanna Bibbiani, Ilaria Colzi, Cosimo Taiti, Werther Guidi Nissim, Alessio Papini, Stefano Mancuso, Cristina Gonnelli
This work investigated the effect of Zn excess on growth, metal accumulation and photosynthetic changes in Tetradenia riparia, in relation to possible variations in the composition of the plant volatilome. Experiments were carried out in hydroponics exposing plants to a range of Zn concentrations. Zinc excess negatively affected plant growth in a dose-dependent manner. The metal was accumulated proportionally to its concentration in the medium and preferentially allocated to roots. All the photosynthetic parameters and the concentration of some photosynthetic pigments were negatively affected by Zn, whereas the level of leaf total soluble sugars remained unchanged...
June 2018: Plant Science: An International Journal of Experimental Plant Biology
Wenhai Luo, Bangxi Zhang, Yanmeng Bi, Guoxue Li, Qiaoping Sun
In this study, we investigated the impact of intensive aeration pre-treatment on nutrient contents and phytotoxicity of anaerobically digested manure centrate. Activated sludge from conventional wastewater treatment plants was added to reinforce the aeration process. Results show that the addition of activated sludge did not negatively affect the nutrient contents, but significantly reduced the phytotoxicity of digested centrate, as indicated by an enhancement of seed germination index, during the aeration treatment...
March 26, 2018: Chemosphere
Shinji Ishikawa, Yuki Ono, Norikuni Ohtake, Kuni Sueyoshi, Sayuri Tanabata, Takuji Ohyama
Leguminous plants form root nodules with rhizobia that fix atmospheric dinitrogen (N₂) for the nitrogen (N) nutrient. Combined nitrogen sources, particular nitrate, severely repress nodule growth and nitrogen fixation activity in soybeans ( Glycine max [L.] Merr.). A microarray-based transcriptome analysis and the metabolome analysis were carried out for the roots and nodules of hydroponically grown soybean plants treated with 5 mM of nitrate for 24 h and compared with control without nitrate. Gene expression ratios of nitrate vs...
April 12, 2018: Plants (Basel, Switzerland)
B Suyamud, P Thiravetyan, B Panyapinyopol, D Inthorn
Bisphenol A (BPA) is one of the most abundant endocrine-disrupting compounds which is found in the aquatic environment. However, actual knowledge regarding the effect of plant-bacteria interactions on enhancing BPA removal is still lacking. In the present study, Dracaena sanderiana endophytic bacteria interactions were investigated to evaluate the effect of bacterial inoculation on BPA removal under hydroponic conditions. Two plant growth-promoting (PGP) bacterial strains, Bacillus thuringiensis and Pantoea dispersa, which have high BPA tolerance and can utilize BPA for growth, were used as plant inocula...
April 5, 2018: Ecotoxicology and Environmental Safety
Qi Chen, Xueyan Lu, Xiaorui Guo, Yajie Pan, Bofan Yu, Zhonghua Tang, Qingxi Guo
Cd(II) is one of the most widespread and toxic heavy metals and seriously threatens plant growth, furthermore negatively affecting human health. For survival from this metal stress, plants always fight with Cd(II) toxicity by themselves or using other external factors. The effects of second metals copper (Cu(II)), zinc (Zn(II)) and calcium (Ca(II)) on the Cd(II)-affected root morphology, Cd(II) translocation and metabolic responses in Catharanthus roseus were investigated under hydroponic conditions. We found that the Cd-stressed plants displayed the browning and rot root symptom, excess H2 O2 content, lipid peroxidation and Cd(II) accumulation in plants...
April 4, 2018: Ecotoxicology and Environmental Safety
Hongen Liu, Zhiwei Shi, Jinfeng Li, Peng Zhao, Shiyu Qin, Zhaojun Nie
Selenium (Se) is a necessary trace element for humans and animals, and Se fertilization is an efficient way to increase Se concentration in the edible parts of crops, thus enhance the beneficiary effects of Se in human and animal health. Due to the similarity of physical and chemical properties between phosphate () and selenite (), phosphorus (P) supply often significantly impacts the absorption of Se in plants, but little is known about how P supply influences the subcellular distribution and chemical forms of Se...
2018: Frontiers in Plant Science
Linlin Huang, Mingjun Li, Kun Zhou, Tingting Sun, Lingyu Hu, Cuiying Li, Fengwang Ma
Using a hydroponics culture system, we monitored morphological, physiological, and molecular changes in Malus prunifolia seedlings when drought conditions induced by 5% polyethylene glycol (PEG) were combined with a low or normal supply of N (0.05 mM or 1 mM NH4 NO3 , respectively). Under either nutrient level, drought stress negatively inhibited seedling performance, as manifested by reduced photosynthesis and biomass production, decreased accumulations of total N, and inhibited root growth. Concentrations of NO3 - and NH4 + and the activities of enzymes involved in N metabolism (nitrate reductase, glutamine synthetase, and glutamate synthase) were also significantly decreased under drought stress...
March 28, 2018: Plant Physiology and Biochemistry: PPB
Matthew Alan Limmer, Patrick Wise, Gretchen E Dykes, Angelia L Seyfferth
While root Si transporters play a role in the uptake of arsenite and organic As species dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA) in rice ( Oryza sativa L.), the impact of Si addition on the accumulation of DMA and MMA in reproductive tissues has not been directly evaluated, particularly in isolation from inorganic As species. Furthermore, DMA and MMA are suspected causal agents of straighthead disorder. We performed a hydroponic study to disentangle the impact of Si on accumulation of DMA and MMA in rice grain...
April 9, 2018: Environmental Science & Technology
Xuehui Yao, Wenchao Zhao, Rui Yang, Jianli Wang, Fukuan Zhao, Shaohui Wang
Background: Guard cell protoplasts (GCPs) isolated from various plants have proven to be especially useful for studies of signal transduction pathways and plant development. But it is not easy to isolate highly purified preparations of large numbers of GCPs from plants. In this research, our focus is on a method to isolate large numbers of guard cells from tomato leaves. The protocols described yield millions of highly purified, viable GCPs, which are also suitable for studies on guard cell physiology...
2018: Plant Methods
Faride Asgari, Ahmad Majd, Parissa Jonoubi, Farzaneh Najafi
Nowadays, nanoparticles are extensively being utilized in medicine, industry, and agriculture thus distributed into the environment. Hence, it is essential to examine exactly the impact of these materials on a variety of organisms, including various species of plants. Therefore, in the current study, we compared the effects of sodium silicate and nano silicon (SiNP) (both at two concentrations of 5 and 10 mM) separately on lignification of the xylem cell wall, antioxidant enzyme activities, ultrastructure of leaf and root cells, expression of silicon transporter (Lsi1) and phenylalanine ammonia lyase (PAL), and also evaluated the protein content and chemical content of oat plants (Avena sativa L...
March 20, 2018: Plant Physiology and Biochemistry: PPB
Ambrin Sarwar, Muhammad Nadeem Hassan, Muhammad Imran, Mazhar Iqbal, Saima Majeed, Günter Brader, Angela Sessitsch, Fauzia Yusuf Hafeez
The potential of the Bacillus genus to antagonize phytopathogens is associated with the production of cyclic lipopeptides. Depending upon the type of lipopeptide, they may serve as biocontrol agents that are eco-friendly alternatives to chemical fertilizers. This study evaluates the biocontrol activity of surfactin-producing Bacillus (SPB) strains NH-100 and NH-217 and purified surfactin A from these strains against rice bakanae disease. Biologically active surfactin fractions were purified by HPLC, and surfactin A variants with chain lengths from C12 to C16 were confirmed by LCMS-ESI...
April 2018: Microbiological Research
Sara Monzerrat Ramírez-Olvera, Libia Iris Trejo-Téllez, Soledad García-Morales, Juan Antonio Pérez-Sato, Fernando Carlos Gómez-Merino
Cerium (Ce) belongs to the rare earth elements (REEs), and although it is not essential for plants, it can stimulate growth and other physiological processes. The objective of this research was to evaluate the effect of Ce on seed germination, initial seedling growth, and vegetative growth in rice (Oryza sativa L.) cv. Morelos A-98. During the germination process, the seeds were treated with Ce concentrations of 0, 4, 8, and 12 μM; after 5 d, germination percentage was recorded and after 10 d seedling growth was measured...
2018: PloS One
Wenli Ding, Peta L Clode, Jon C Clements, Hans Lambers
Phosphorus (P)-deficiency symptoms are known for Lupinus species grown in calcareous soil, but we do not know if this is due to a high calcium (Ca) availability or a low P availability in the soil. To address this problem, we explored both the effects of Ca and its interactions with P on nutrient status and growth of three Lupinus species. Two Ca-sensitive genotypes (L. angustifolius L. P26723 and L. cosentinii Guss. P27225) and two Ca-tolerant genotypes (L. angustifolius L. cv Mandelup and L. pilosus Murr...
March 23, 2018: Physiologia Plantarum
Ying Feng, Yingjie Wu, Jie Zhang, Qian Meng, Qiong Wang, Luyao Ma, Xiaoxiao Ma, Xiaoe Yang
SaNRAMP3 gene cloned from a Zn/Cd hyperaccumulator Sedum alfredii was ectopicly expressed in Brassica juncea, a fast-growing and high-biomass crop plant. In a tissue culture experiment, transgenic plants were grown on MS medium with 0, 25, 50, 100, 200 μM Cd. It was shown that, at the same Cd treatment, the Cd tolerance of transgenic plants had no significant difference with those of wild-type plants (WT). However, the shoot Cd content and accumulation were improved significantly while the root Cd content and accumulation were descended significantly by SaNRAMP3 gene expression, which obviously enhanced the Cd root-to-shoot translocation factor (TF)...
March 19, 2018: Ecotoxicology and Environmental Safety
Mahesh Rangu, Zhujia Ye, Sarabjit Bhatti, Suping Zhou, Yong Yang, Tara Fish, Theodore W Thannhauser
In this paper, we report on aluminum (Al)-induced root proteomic changes in switchgrass. After growth in a hydroponic culture system supplemented with 400 μM of Al, plants began to show signs of physiological stress such as a reduction in photosynthetic rate. At this time, the basal 2-cm long root tips were harvested and divided into two segments, each of 1-cm in length, for protein extraction. Al-induced changes in proteomes were identified using tandem mass tags mass spectrometry (TMT-MS)-based quantitative proteomics analysis...
March 22, 2018: Proteomes
De-Ju Cao, Xun Yang, Geng Geng, Xiao-Chun Wan, Ru-Xiao Ma, Qian Zhang, Yue-Gan Liang
A hydroponic experiment was performed to investigate the Cd absorption and subcellular distribution in tea plant, Camellia sinensis. Increased Cd accumulation potential was observed in the tea plant in a Cd-enriched environment, but most of the Cd was absorbed by the roots of C. sinensis. The Cd in all the root fractions was mostly distributed in the soluble fraction, followed by the cell wall fraction. By contrast, the Cd was least distributed in the organelle fraction. The adsorption of Cd onto the C. sinensis roots was described well by the Langmuir isotherm model than the Freundlich isotherm...
March 21, 2018: Environmental Science and Pollution Research International
Priscila Aparecida Milani, João Luiz Consonni, Geórgia Labuto, Elma Neide Vasconcelos Martins Carrilho
Sugarcane bagasse and hydroponic lettuce roots were used as biosorbents for the removal of Cu(II), Fe(II), Mn(II), and Zn(II) from multielemental solutions and lake water, in batch processes. These biomasses were studied in natura (lettuce roots, NLR, and sugarcane bagasse, NSB) and chemically modified with HNO3 (lettuce roots, MLR, and sugarcane bagasse, MSB). The results showed higher adsorption efficiency for MSB and either NLR or MLR. The maximum adsorption capacities (qmax ) in multielemental solution for Cu(II), Fe(II), Mn(II), and Zn(II) were 35...
March 20, 2018: Environmental Science and Pollution Research International
Weilan Zhang, Irene M C Lo, Liming Hu, Chia Pao Voon, Boon L Lim, Wayne K Versaw
The use of nano zero-valent iron (nZVI) for arsenate (As(V)) remediation has proven effective, but full-scale injection of nZVI into the subsurface has aroused serious concerns for associated environmental risks. This study evaluated the efficacy of nZVI treatment for arsenate remediation and its potential hazards to plants using Arabidopsis thaliana grown in a hydroponic system. Biosensors for inorganic phosphate (Pi) and MgATP2- were used to monitor in vivo Pi and MgATP2- levels in plant cells. The results showed that nZVI could remove As(V) from growth media, decrease As uptake by plants, and mitigate As(V) toxicity to plants...
March 19, 2018: Environmental Science & Technology
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