Synthetic food dyes have garnered significant attention due to potential health risks, including cytotoxicity, allergenicity, and even carcinogenicity observed in animal models. Given the widespread use of artificial food dyes in the food industry and potential concerns regarding their safety, this investigation could explore the influence of a lemon-flavored food dye on Allium cepa L.. Onion root tip meristems were exposed to various concentrations (0%, 0.25%, 0.5%, 1%, and 2%) of food dye in aqueous solutions for 24 hours at room temperature. A concentration-dependent detrimental effect was observed on all evaluated morphological parameters, including root number, root length, dry weight, and wet weight, with the control group exhibiting the highest values and the 2% treatment group displaying the lowest. Mitotic analysis revealed normal cell division in the control group, but increasing food dye concentrations induced a spectrum of chromosomal aberrations, suggesting disruption of spindle fibers and chromosome cohesion defects. The control group displayed the highest mitotic index (MI) of 9.2, with a positive correlation observed between increasing food dye concentration and the frequency of mitotic abnormalities (0.3 in control vs. 16.8 at 2% treatment). The most prevalent abnormality was multipolar anaphase (5.4 at 2% treatment), while anaphase bridge displayed the lowest incidence (1.7 at 2% treatment). This is evidenced by the significant decrease in root growth parameters (length and number) and (MI), a key indicator of cell division activity. Furthermore, the observed chromosomal aberrations, including sticky metaphase, C-mitosis, laggard chromosomes, anaphase bridges, and multipolar anaphase, are strong indicators of potential genotoxicity.

The effect of the different concentrations of sodium metabisulphite on the chromosome aberration in the root tip cells of Allium cepa L. are given in table (3.2) (figure 3.2). The sodium metabisulphite treatment caused a variety of cytogenetic consequences after 24 hours, which are represented by six types of abnormalities (bridges of anaphase, micronucleus, vagrant chromosomes, gaps in chromatid, chromosomal fragmentation and ring chromosomes). The total of chromosomal abnormality were observed with increasing of sodium metabisulphite concentration and they were dose dependent greatly increased (Table 3.2). The total number of anomalies in control cells was 5, but in cells treated with 2.0 ml/L sodium metabisulphite, the number rose to 255.

The harmful effects of the active ingredient malathion and the fungicide ridomil on Allium cepa L. were studied in this research. We employed the percentage of germination, length of root, weight gain, and other factors to achieve this goal. The results revealed substantial Weight increase, germination percentage, and root length have all changed. The study's focus was to assess the toxic impact of malathion pesticide and fungicide ridomil on root growth. Allium cepa germination percentage, root length, and gaining weight were measured after they were subjected to a variety of dosages of malathion and fungicide ridomil (0.0,0.25, 0.5, 1.0, and 2.0, mgL-1) for 12 days. Subsequently the root development Both malathion and fungicide ridomil concentrations were inversely associated at all times when you're exposed,according to the obtained results.