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- 검색키워드
- 저자 : Laskar Rafiul Amin (검색결과 2 건)
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Nilofer Sheikh,Himangshu Patowary,Rafiul Amin Laskar 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.3
Background Malathion (organophosphate) and cypermethrin (pyrethroid) are widely in use to facilitate protection of major food crops in agriculture, due to which it is important to understand their toxic potential. Allium cepa L. has been considered as a reliable genetic model to detect the toxicity of all sorts of pollutants. Objective The objective of the present work is to determine the cytotoxic and genotoxic effects of two widely used pesticides (malathion and cypermethrin) using A. cepa assay. Allium root growth inhibition test showed 0.5% concentration as the EC50 value in both the pesticides. In the toxicity experiment, 1/10 × EC50; 1/5 × EC50; EC50; 2 × EC50 and 3 × EC50 concentrations of both the pesticides along with a control were employed in Allium assay. Results Cytotoxic study showed mitotic index decreased with increasing the pesticides concentrations and exposure time. A series of mitotoxicity was observed under the influence of malathon and cypermethrin. Most types of chromosome aberrations observed in high percentage were stickiness, disturbance, c-metaphase, chromosome bridges in anaphase, lagging chromosome, and binucleate lesions. It was observed that malathion and cypermethrin are highly genotoxic to the onion, causing aberration at different phases of mitosis which can arrest cellular growth and may lead to senescence. Conclusion In conclusion, the present results showed that malathion and cypermethrin can get absorbed in the exposed plant parts or other non-target organisms in the vicinity, and may adversely affect their genomes, thus cause significant harm to crop plants and the environment as well.
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Hasan Nazarul,Choudhary Sana,Laskar Rafiul Amin,Naaz Neha,Sharma Nidhi 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.5
This study was conducted to understand the toxic effects of cadmium nitrate and lead nitrate [Cd(NO3)2 and Pb(NO3)2] and their mitigating role on the Capsicum annuum L. cultivar. The biological effects of Cd and Pb were investigated using stress response indicators such as stomata, gas exchange parameters, proline, and defensive enzyme systems. Fresh seeds were treated with different concentrations (100, 200, 300, 400, and 500 ppm) of both Cd and Pb for 6 h. Cytological effects were observed under a microscope by crushing acetocarmine-stained anthers on glass slides. Stomata size was determined with a scanning electron microscope. Photosynthetic and transpiration rates were measured using an infrared gas analyzer. Chlorophyll and carotenoid pigments were determined analytically with a spectrophotometer. An expected decrease in chlorophyll and carotenoid content was observed with increasing concentrations. Cytotoxic effects of Cd and Pb resulted in various changes in chromosomes including laggard, stickiness, multi-nucleate, and disturbed polarity. The size of stomata decreased at higher concentration and measured to 2.20and 4.6 μM with low stomata conductance at 500 ppm of Cd and Pb. Photosynthetic and transpiration rates showed a moderate trend with increasing concentrations, where high photosynthetic and transpiration rates were measured to 20.20 and 23.40 m−2 s−1 at 200 ppm concentration. Maximum SOD and CAT activ- ity was 2.82 and 6.34 unit mg−1 at 300 ppm of Cd. These results are valuable for understanding how crop plants respond to heavy metals, especially when using them as inducing agents during cyto-physiological experiments.
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