Abstract
The present investigation deals with the effect of static magnetic field of 2.25×103 Gauss on the mitotic and meiotic divisions and nucleoli of root meristematic cells of Alllum cepa L. In the present effort the effect of static magnetic field was compared with that of electro-magnetic field (He-Ne Laser beam of 2 mW) also.A significant fall in mitotic indices was noticed on static magnetic field whereas such fall was found much sharply in case of electrimagnetic field. Such treatment was also associated with various anomalies e. g. stickiness, clumping of chromosomes, anaphase chromosome bridge and disturbed spindles.Although a significant increase in meiotic indices was noticed due to static magnetic field after 30 minutes compared to the control, a considerable decrease in the frequency of cells at metaphase stage was recorded indicating the role of spindle abnormality due to magnetic field. Various meiotic abnormalities were also recorded.Average nuclear and nucleoar size was found decreased significantly due to magnetic field treatment with the increase in time of treatment. Since the nucleolar size is a reliable reflector of nucleolar activity, such decrease may be correlated to the mitostatic activity of the cells.
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