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This study presents the impacts of TiO nanoparticles (TNPs) amendment on plant growth, phosphorus (P) content, and dissolved organic matter (DOM) composition in the rhizosphere. For this work, wheat plants (Galaxy-2013) were exposed to soil amended by different amounts of TNPs (i.e., 0, 50, and 100 mg TNP/kg of soil) for 40 days and harvested. The maximum increase in the shoots and roots lengths reached 15.9 ± 0.3% and 3.8 ± 0.3% respectively, which was concurrent with improved P content in the plants. Compared with the control, the P content in the shoots and roots was enriched by 23.4% and 17.9% at 50 mg TNP/kg of soil respectively. The increased electrical conductivity (EC) and decreased pH of the rhizosphere implied that the added TNPs might induce the enhancement of the P dissolution. Fluorescence spectroscopy revealed the increase of microbial activity as depicted by the humification index (HIX) changing from 0.88 ± 0.02 to 0.92 ± 0.01, with increasing TNPs amendments. Excitation-emission matrix coupled with parallel factor analysis (EEM-PARAFAC) showed the presence of four fluorescent components (C1 to C4) in the rhizosphere. Three of them (C1-C3) were related to humic-like substances, while the C4 was associated with protein-like fluorescence. EEM-PARAFAC results revealed the degradation of C4, and the enhancement of the other three components, which supported the stimulation of microbial activity by the TNPs amendment. This study provided new insights into the relation between improved phytoavailble P in plants and the changes in the rhizosphere soil solution chemistry and the DOM composition upon TNPs amendments.
This article was published in the following journal.
We report the results of using the excitation-emission matrix (EEM) method combined with parallel factor analysis (PARAFAC) to investigate the characteristics and occurrence of dissolved organic matte...
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Microscopy of specimens stained with fluorescent dye (usually fluorescein isothiocyanate) or of naturally fluorescent materials, which emit light when exposed to ultraviolet or blue light. Immunofluorescence microscopy utilizes antibodies that are labeled with fluorescent dye.
The circulation of nitrogen in nature, consisting of a cycle of biochemical reactions in which atmospheric nitrogen is compounded, dissolved in rain, and deposited in the soil, where it is assimilated and metabolized by bacteria and plants, eventually returning to the atmosphere by bacterial decomposition of organic matter.
Any substance in the air which could, if present in high enough concentration, harm humans, animals, vegetation or material. Substances include GASES; PARTICULATE MATTER; and volatile ORGANIC CHEMICALS.
Test for tissue antigen using either a direct method, by conjugation of antibody with fluorescent dye (FLUORESCENT ANTIBODY TECHNIQUE, DIRECT) or an indirect method, by formation of antigen-antibody complex which is then labeled with fluorescein-conjugated anti-immunoglobulin antibody (FLUORESCENT ANTIBODY TECHNIQUE, INDIRECT). The tissue is then examined by fluorescence microscopy.
Chemical compounds which yield hydrogen ions or protons when dissolved in water, whose hydrogen can be replaced by metals or basic radicals, or which react with bases to form salts and water (neutralization). An extension of the term includes substances dissolved in media other than water. (Grant & Hackh's Chemical Dictionary, 5th ed)
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