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Root Morphology and Zn^2＋ uptake kinetics of the Zn Hyperaccumulator of Sedum alfredii Hance

Journal of Integrative Plant Biology 2005年第8期47卷 927-934页

作者： Ting-Qiang LI Xiao-E YANG Zhen-Li HE Jin-Yan YANG Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health Zhejiang University Huajiachi Campus Hangzhou 310029 China University of Florida Indian River Research and Education Center Fort Pierce Florida 34945 USA

Root morphology and Zn^2＋ uptake kinetics of the hyperaccumulating ecotype （HE） and nonhyperaccumulating ecotype （NHE） of Sedum alfredii Hance were investigated using hydroponic methods and the radiotracer flux technique. The results indicate that root length, root surface area, and root volume of NHE decreased significantly with increasing Zn^2＋ concentration in growth media, whereas the root growth of HE was not adversely affected, and was even promoted, by 500μmol/L Zn^2＋. The concentrations of Zn^2＋ in both ecotypes of S. alfredii were positively correlated with root length, root surface area and root volumes, but no such correlation was found for root diameter. The uptake kinetics for ^65Zn^2＋ in roots of both ecotypes of S. alfredii were characterized by a rapid linear phase during the first 6 h and a slower linear phase during the subsequent period of investigation. The concentration-dependent uptake kinetics of the two ecotypes of S. alfredii could be characterized by the Michaelis-Menten equation, with the Vmax for ^65Zn^2＋ influx being threefold greater in HE compared with NHE, indicating that enhanced absorption into the root was one of the mechanisms involved in Zn hyperaccumulation. A significantly larger Vmax value suggested that there was a higher density of Zn transporters per unit membrane area in HE roots.

关键词： phytoremediation Sedum alfredii translocation uptake kinetics zinc (Zn).

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Cadmium uptake and speciation changes in the rhizosphere of cadmium accumulator and non-accumulator oilseed rape varieties

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Journal of Environmental Sciences 2009年第8期21卷 1125-1128页

作者： SU Dechun XING Jianping JIAO Weiping WONG Woonchung College of Resources and Environmental Sciences China Agricultural University Beijing 100193 China Department of Biology Hong Kong Baptist University Kowloon Tong Hong Kong SAR China

Characteristics of cadmium （Cd） uptake kinetics and distribution of Cd speciation in the rhizosphere for Cd accumulator and nonaccumulator oilseed rape varieties were investigated under nutrient solution and rhizobox soil culture conditions. The results showed that the maximal influx （Vmax） for Cd^2＋ and Km were significantly different for the two oilseed rape varieties. The value of Vmax for Cd accumulator oilseed rape Zhucang Huazi was two-fold greater than that for oilseed rape Chuan you Ⅱ-93. The exchangeable Cd concentration in the rhizosphere was significantly lower than in non-rhizospheric soils supplemented with CdSO4 for both the varieties. Carbonate-bound Cd in the rhizosphere of Cd accumulator oilseed rape was significantly higher than that in the rhizosphere of nonaccumulator oilseed rape and non-rhizospheric soil. Cd accumulator oilseed rape had a higher Cd^2＋ affinity and more ability to uptake insoluble Cd in the soil than the non-accumulator oilseed rape.

关键词： cadmium oilseed rape rhizosphere uptake kinetics

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Toxicity evaluation of ZnO and TiO_2 nanomaterials in hydroponic red bean(Vigna angularis) plant:Physiology, biochemistry and kinetic transport

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Journal of Environmental Sciences 2018年第10期30卷 140-152页

作者： Shanaz Jahan Yatimah Binti Alias Ahmad Farid Bin Abu Bakar Ismail Bin Yusoff Department of Geology Environmental and Earth Sciences Faculty of Science University of Malaya Department of Chemistry Faculty of Science University of Malaya University Malaya Centre for Ionic Liquids (UMCi L) University of Malaya

The toxicity and kinetic uptake potential of zinc oxide（Zn O） and titanium dioxide（TiO2）nanomaterials into the red bean（Vigna angularis） plant were investigated. The results obtained revealed that Zn O, due to its high dissolution and strong binding capacity, readily accumulated in the root tissues and significantly inhibited the physiological activity of the plant. However, TiO2 had a positive effect on plant physiology, resulting in promoted growth. The results of biochemical experiments implied that Zn O, through the generation of oxidative stress, significantly reduced the chlorophyll content, carotenoids and activity of stress-controlling enzymes. On the contrary, no negative biochemical impact was observed in plants treated with TiO2. For the kinetic uptake and transport study, we designed two exposure systems in which Zn O and TiO2 were exposed to red bean seedlings individually or in a mixture approach. The results showed that in single metal oxide treatments, the uptake and transport increased with increasing exposure period from one week to three ***, in the metal oxide co-exposure treatment, due to complexation and competition among the particles, the uptake and transport were remarkably decreased. This suggested that the kinetic transport pattern of the metal oxide mixtures varied compared to those of its individual constituents.

关键词： Metal oxides Physiological impacts Biochemical impacts uptake kinetics Translocation Growth inhibition

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Mechanistic Model for Predicting NO_3-N uptake by Plants and Its Verification

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Pedosphere 1991年第2期1卷 97-108页

作者： XUANJIA－XIANG ZHANGLI－GAN 等 LMCP，InstituteofSoilScience AcademiaSinicaP.O.Box821Nanjing210008（China） AnhuiAgriculturalCollege

Some mechanistic models have been proposed to predict the No3- concentrations in the soil solution at root surface and the NO3-N uptake by plants, but all these relatively effective non-steady state models have not yet been verified by any soil culture experiment. In the present study, a mathematical model based on the nutrient transport to the roots, root length and root uptake kinetics as well as taking account of the inter-root competition was used for calculation, and soil culture experiments with rice, wheat and rape plants grown on alkali, neutral and acid soils in rhizoboxes with nylon screen as a isolator were carried out to evaluate the prediction ability of the model through comparing the measured NO3-concentrations at root surface and N uptake with the calculated values. Whether the inter-root competition for nutrients was accounted for in the model was of less importance to the calculated N uptake but could induce significant changes in the relative concentrations of NO3- at root surface. For the three soils and crops, the measured NO3-N uptake agreed well with the calculated one, and the calculated relative concentrations at root surface were approximate to the measured values. But an appropriate rectification for some conditions is necessary when the plant uptake parameter obtained in solution culture experiment is applied to soil culture. In contrast with the present non-steady state model, the predicted relative concentrations, which show an accumulation, by the Phillips' steady-state model were distinct from the measured values which show a depletion, indicating that the present model has a better prediction ability than the steady-state model.

关键词： inter-root competition mechanistic model nitrate ralative concentration at root surface uptake kinetics

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Anti-microtubule activity of tubeimoside I and its colchicines binding site of tubulin

Anti-microtubule activity of tubeimoside I and its colchicin...

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第九届全国中药和天然药物学术研讨会

作者： Rundi Ma~1 Gang Song~1 Wenbing You~1 Lijian Yu~(1*) Weiming Su~1 Mingneng Liao~1 Yongping Zhang~1 Laizhen Huang~1 Xiaoyu Zhang~(1,3) Tingxi Yu~(1,2) ~1Key Laboratory of Marine Materia Medica,Guangdong Ocean University,Jiefang East Avenue 40,Xiashan,Zhanjiang 524025,China ~2Department of Biochemistry and Molecular Biology,Public Health,Johns Hopkins University, Baltimore,MD 21205,USA ~3Department of Otorhinolaryngology-Head and Neck Surgery,University of Maryland School of Medicine,Baltimore,MD 21228,USA.The authors contributed equally to this work.

Background:Tubeimoside I(TBMS1)was isolated from the tubers of Bolbostemma paniculatum(Maxim.)***1 shows potent antitumor *** present study was conducted to investigate the antimicrotubule role of TBMS1 and its binding site of ***:Cell growth inhibition was measured by MTT after treatment with *** kinetics of TBMS1 by human nasopharyngeal carcinoma CNE-2Z cell line(CNE-2Z)was assayed by *** protein(MTP)was prepared from porcine brain through two cycles of polymerization-depolymerization in a high molarity *** of MTP polymerization induced by TBMSI was determined by a turbidity measurement and a sedimentation assay:the interactions of TBMS1 with tuhulin within CNE-2Z cells were investigated by immunofluorescence microscopy and ***1 was tested for its ability to inhibit binding of known tubulin ligands through competitive binding ***:TBMS1 displayed growth inhibitory activity against CNE-2Z cells with ICvalue of 16.7μM for 72 *** analysis of TBMS1 uptake by CNE-2Z cells displayed the initial slow TBMS1 uptake and then gradually reaching an maximum uptake near 18 ***-2Z cells treated with TBMSI(25μM,3 h)were sufficient to cause the microtubular network disruption,lmmunohlot analysis showed that the proportion of cytosolic tubulin of cells treated with TBMS1 increased in a time-and concentration-dependent ***1 did not inhibit the binding of vinblastine to *** binding to tubulin was inhibited in the presence of ***:TBMS1 is an anti-microtubule agent,and its binding site of tubulin is the colchicine binding site of tubulin.

关键词： Bolbostemma paniculatum(Maxim.)Franquet Tubeimoside I uptake kinetics Anti-microtubule activity Colchicine binding site of tubulin

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