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Zahra, Zahra,Waseem, Naima,Zahra, Rubab,Lee, Hwanhui,Badshah, Mohsin Ali,Mehmood, Arshad,Choi, Hyung-Kyoon,Arshad, Muhammad American Chemical Society 2017 Journal of agricultural and food chemistry Vol.65 No.28
<P>Plants have the natural ability to withstand stress conditions through metabolic adjustments. The present study aimed at investigating the effects of titanium dioxide nanoparticles (TiO2 NPs) application (0, 25, 50, 150, 250, 500, and 750 mg kg(-1)) in phosphorus-deficient soil in terms of growth responses, P contents, and metabolic alterations in rice. TiO2 NPs application increased shoot length up to 14.5%. Phosphorus contents in rice roots, shoots, and grains were increased by 2.6-, 2.4-, and 1.3-fold, respectively, at 750 mg kg(-1) of TiO2 NPs. Gas chromatography-mass spectrometry (GC-MS)-based metabolomics revealed increased levels of amino acids, palmitic acid, and glycerol content in grains resulting from plants grown in 750 mg kg(-1) TiO2 NPs-treated soil. Furthermore, no translocation of TiO2 NPs from the treated soil to rice grains was detected by inductively coupled plasma-optical emission spectrometry (ICP-OES), which suggests no risk of TiO2 NPs intake via grain consumption. The observed data indicates the strong relationship among NPs application, P contents, and metabolic alterations.</P>
Zahra, Zahra,Kim, Seok-Young,Kim, Hye-Youn,Lee, Hwanhui,Lee, Heayyean,Jeon, Jun-Yeong,Kim, Dong-Min,Kim, Dong-Myung,Hong, Seong-Joo,Cho, Byung-Kwan,Lee, Hookeun,Lee, Choul-Gyun,Arshad, Muhammad,Choi, American Chemical Society 2018 Journal of agricultural and food chemistry Vol.66 No.32
<P>This study aimed to improve the production of phycobiliproteins using TiO<SUB>2</SUB> nanoparticles (NPs) in <I>Synechocystis</I> sp. PCC 6803. The growth characteristics of <I>Synechocystis</I> cells were not affected by TiO<SUB>2</SUB> NPs treatment, but this treatment increased the chlorophyll content significantly by 62.2% (14.6 mg/L) compared to that of control (9.0 mg/L) on day 16. Phycocyanin production was increased by 33.8% (29.3 g/L) compared to that of control (21.9 g/L) on day 8. Allophycocyanin production was increased by 55.0% (6.2 g/L) compared to that of control (4.0 g/L) on day 8, and by 22.4% (16.4 g/L) compared to that of control (13.4 g/L) on day 16. Direct infusion mass spectrometry revealed that TiO<SUB>2</SUB> NPs treatment significantly increased the levels of major thylakoid membranes of monogalactosyldiacylglycerols (18:2/18:3, 18:2/18:2, 18:1/18:2), phosphatidylglycerol (16:0/16:1), and sulfoquinovosyldiacylglycerols (16:0/16:1, 16:0:18:4) on day 8. These findings indicate that TiO<SUB>2</SUB> NPs have potential for commercial applications in <I>Synechocystis</I> species or other microalgal strains.</P> [FIG OMISSION]</BR>
Zahra, Zahra,Maqbool, Tahir,Arshad, Muhammad,Badshah, Mohsin Ali,Choi, Hyung-Kyoon,Hur, Jin Elsevier 2019 CHEMOSPHERE - Vol.227 No.-
<P><B>Abstract</B></P> <P>This study presents the impacts of TiO<SUB>2</SUB> 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.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Changes in DOM from TNPs-amended soil were tracked by EEM-PARAFAC. </LI> <LI> TNPs amendment in soil enhanced the growth and P uptake of wheat plants. </LI> <LI> Addition of TNPs resulted in microbial humification of rhizosphere DOM. </LI> <LI> Compositional changes in DOM were associated with TNPs-induced plant growth. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>