SummaryThe nucleus wields undisputed control in the normal disposition of almost all cellular processes. It houses most, if not all, parts of the genetic information of an organism. A nuclear morphology deviant from one which is normally encountered is proof of genomic instability. The presence of micronuclei authenticates this phenomenon. The present study reports for the first time, the dose-specific occurrence of micronuclei and microcells during microsporogenesis in Crotalaria juncea L. in response to colchicine exposure. It also assesses various meiotic chromosomal abnormalities induced in response to the dose administered and the trends discernible.
ABSTRACT:The present study documents ionizing radiation induced hormesis and its cytological evaluation via study of microsporogenesis in Crotalaria juncea L. (sunnhemp). Morphometric traits viz. plant height, seedling height, seed yield, lateral branches, number of pods and biomass were analyzed. A concomitant study of radiation response on the cytology of the plant has been done via studying pollen mother cells at different stages of microsporogenesis. Doses used were 100, 200, 300, 400, 500 and 600 Gy with respect to control. Doses in the range of 100 to 300 Gy were shown to induce hormesis. Cytological aberrations had a stabilizing trend upto the hormetic dose but showed a sharp increase at chronic doses.
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