DNA integrity of onion root cells under catechol influence

Area of Science:

• Environmental Science
• Toxicology
• Molecular Biology

Background:

• Catechol is a toxic organic pollutant found in industrial and agricultural waste.
• It originates from pesticides, preservatives, cosmetics, dyes, and synthetic intermediates.
• Assessing catechol's genotoxicity is crucial for environmental and health risk evaluation.

Purpose of the Study:

• To evaluate the genotoxicity of catechol using onion (Allium cepa) root cells.
• To investigate the DNA-level effects of catechol exposure.
• To differentiate between necrotic and apoptotic cell death induced by catechol.

Main Methods:

• Genotoxicity was assessed using random amplified polymorphic DNA (RAPD) analysis.
• Time-lapse DNA laddering tests were employed to observe DNA fragmentation.
• Acridine orange/ethidium bromide staining was used for cell death differentiation.

Main Results:

• RAPD analysis indicated catechol induces point mutations, deletions, and chromosomal rearrangements.
• DNA laddering confirmed catechol provokes both necrosis and apoptosis.
• Cell staining successfully distinguished between apoptotic and necrotic cells in Allium cepa root tips.

Conclusions:

• Catechol exhibits significant genotoxic potential, inducing various DNA alterations.
• It triggers programmed cell death (apoptosis) and necrosis in plant cells.
• These findings underscore the environmental risks associated with catechol contamination.