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Sarowar, Sujon,Oh, Hyun Woo,Cho, Hye Sun,Baek, Kwang-Hyun,Seong, Eun Soo,Joung, Young Hee,Choi, Gyung Ja,Lee, Sanghyeob,Choi, Doil Blackwell Scientific Publishers and BIOS Scientifi 2007 The Plant Journal Vol. No.
<P>Summary</P><P>The CCR4-associated factor 1 (CAF1) protein belongs to the CCR4-NOT complex, which is an evolutionary conserved protein complex and plays an important role in the control of transcription and mRNA decay in yeast and mammals. To investigate the function of CAF1 in plants, we performed gain- and loss-of-function studies by overexpression of the pepper CAF1 (<I>CaCAF1</I>) in tomato and virus-induced gene silencing (VIGS) of the gene in pepper plants. Overexpression of <I>CaCAF1</I> in tomato resulted in significant growth enhancement, with increasing leaf thickness, and enlarged cell size by more than twofold when compared with the control plants. A transmission electron microscopic analysis revealed that the <I>CaCAF1</I>-transgenic tomato plants had thicker cell walls and cuticle layers than the control plants. In addition to developmental changes, overexpression of <I>CaCAF1</I> in tomato plants resulted in enhanced resistance against the oomycete pathogen <I>Phytophthora infestans</I>. Additionally, microarray, northern and real-time polymerase chain reaction analyses of <I>CaCAF1-</I>transgenic tomato plants revealed that multiple genes were constitutively upregulated, including genes involved in polyamine biosynthesis, defence reactions and cell-wall organogenesis. In contrast, VIGS of <I>CaCAF1</I> in pepper plants caused significant growth retardation and enhanced susceptibility to the pepper bacterial spot pathogen <I>Xanthomonas axonopodis</I> pv. <I>vesicatoria</I>. Our results suggest roles for plant <I>CAF1</I> in normal growth and development, as well as in defence against pathogens.</P>
Abu Ahmed,Atiar Rahman,Sarowar Jahan Khan,Nipun Mojumder,Farjana Sharmin,Muhammad Abu Bakar,Kamirul Hasan Chowdhury,Mohammad Ali Azadi 경희대학교 융합한의과학연구소 2016 Oriental Pharmacy and Experimental Medicine Vol.31 No.4
Water hyacinth (Eichhornia crassipes) has been used in phytoextraction to uptake heavy metals and trace elements in various experiments. This research investigated the protective effects of Water hyacinth extracts on Lead (Pb)-induced toxicity in the albino rat. Forty-eight six-weeks-old Wistar albino male rats (average weight, 180 ± 6.45 g) were divided into six groups: normal control (NC), Pb control (PbC), Chloroform extract (ChEx), Ethyl acetate extract (EAEx), Methanol extract (MeEx) and Ascorbic acid treated groups (AA, positive control). All animals except NC group have been administered with Lead acetate (Pb(CH3COOH)2) before the therapeutic dose. Thrombolytic and cytotoxic effects were evaluated by modified clot lysis and Brine shrimp lethality tests respectively. Biochemical analyses reports revealed that ChEx significantly (P ≤ 0.05) reduced the elevated alkaline phosphatase (ALP) and aspartate amino transferase (AST) whereas MeEx did the alanine amino transferase (ALT) in comparison to positive control. ChEx significantly inhibited the Pb deposition in kidney and liver than two other extracts. ChEx significantly increased the liver protein compared to PbC group. In the thrombolytic assay, EAEx showed the pronounced clot lysis (49.24 %) while ChEx and MeEx showed 45.18 % and 29.13 % of clot lysis respectively. In Brine shrimp lethality bioassay, the LC50 value of the ChEx, EAEx and MeEx were 4.16, 4.47 and 9.27 μg/mg respectively and values were statistically significant (p < 0.05) compared to that of reference cytotoxic agent, Vincristine sulfate (LC50’ 0.55). Histopathological screening of kidney, liver and spleen showed that ethyl acetate extract recovered the highest of the cellular damage caused by Lead acetate. Biochemical and histopathological screening, therefore, demonstrate that Water hyacinth could be one of the promising sources of normalizing the Pb-poisoning and enhancing the thrombolysis in an animal model. Therapeutic prospects of Water hyacinth could be further studied through highlighting a dose-response study.
Molecular Characterization of NLP Function in Nicotiana benthamiana
Eu-Ree Ahn,Sujon Sarowar,전영,배현숙 한국식물학회 2011 Journal of Plant Biology Vol.54 No.3
In this study, we investigated the cellular functions of nuclear localizing protein (NLP) in Nicotiana benthamiana. The GFP fusion protein of Arabidopsis NLP is mostly targeted to the nucleus and cytosol, but it infrequently targets only the nucleus. Silencing of NLP using virus-induced gene silencing caused growth retardation and abnormal leaf development in N. benthamiana. At the cellular level,downregulation of NLP expression increased the size of pavement cells and stomata in the leaf tissues. NLP suppression also increased endoreduplication in leaf cells,suggesting a role of NLP in the endocycle. NLP transcript levels in leaves were significantly increased in response to infection with the nonhost pathogens. NLP deficiency attenuated HR cell death against nonhost pathogens and in response to gene-for-gene interaction. These findings suggest that NLP plays a role in plant development and plant defense responses against pathogens.
Molecular Characterization of NLP Function in Nicotiana benthamiana
Ahn, Eu-Ree,Sarowar, Sujon,Jeon, Young,Pai, Hyun-Sook 한국식물학회 2011 Journal of Plant Biology Vol.54 No.3
In this study, we investigated the cellular functions of nuclear localizing protein (NLP) in Nicotiana benthamiana. The GFP fusion protein of Arabidopsis NLP is mostly targeted to the nucleus and cytosol, but it infrequently targets only the nucleus. Silencing of NLP using virus-induced gene silencing caused growth retardation and abnormal leaf development in N. benthamiana. At the cellular level, downregulation of NLP expression increased the size of pavement cells and stomata in the leaf tissues. NLP suppression also increased endoreduplication in leaf cells, suggesting a role of NLP in the endocycle. NLP transcript levels in leaves were significantly increased in response to infection with the nonhost pathogens. NLP deficiency attenuated HR cell death against nonhost pathogens and in response to gene-for-gene interaction. These findings suggest that NLP plays a role in plant development and plant defense responses against pathogens.
Hossain M.D.,Khan M.N.I.,Hossain Md Sarowar,Ahned S.J.,Alam M.K.,Liba S.I.,Hakim M.A.,Jamil A.T.M.K. 한국물리학회 2022 Current Applied Physics Vol.43 No.-
This article presents the modification of structure-based magnetic, electronic and transport properties along with the conduction mechanism and its relaxation process in a Ni–Zn–Co ferrite tailored by V5+ substitution at B-site replacing Fe3+ ions. The composition Ni0.7Zn0.2Co0.1Fe2-xVxO4 (0≤ x≤ 0.12) was synthesized by standard solid-state reaction method and all samples were crystallized with a single-phase cubic spinel structure belonging to the Fd3m space group. The lattice constants decreased gradually from 8.3673≽A to 8.3602≽A and the average grain sizes (DSEM) are also decreased from 6.92 μm to 1.99 μm due to V5+ ions substitution at Fe3+ of B-site. However, more than 25% of Fe3+ ions migrate to A-site from B-site due to V5+ substitution at Fe3+ of B-site. In all samples θD does not strictly follow the Anderson’s prediction, rather it monotonically decreases to a low value until x = 0.12. Magnetic phase transition temperature shifted to the lower temperature and the net magnetization (ηeB) decreases due to V5+ substitution in Ni–Zn–Co ferrite. Apart this, during conduction charge carriers should require more energy to jump from one cationic site to other for V5+ substitution in the Ni–Zn–Co ferrite and the activation energy (Ea) is much more higher in V5+ substituted sample. Moreover, long-range interaction with localized relaxation mechanism is observed in V5+ doped samples. The resistance at the grain (Rg) is maximum (243.09 Ω) for the sample x = 0.10 while grain boundary resistance (Rgb) is maximum (5.98×105 Ω) for the sample x = 0.07. However, the higher value of ρdC for x = 0.12 sample ensures to be suitable for electromagnets, transformers, electronic inductors, and at high-frequency applications. Moreover, x = 0.07 sample displays high value of TCR ( -8.6%/K at 418 K) which may be utilized as an infrared detector for night vision bolometer material.