Comparative radioresistance of diploids and artificially raised tetraploids ofTrigonella foenum-graecumhas been investigated at 30 and 50 krad of gamma rays. Advantage of using autoploids for such studies have been discussed. Different parameters were taken into consideration. Germination in both cases show little effect of radiation. Despite higher ICV, at higher doses, 4nwere resistant in survival, growth reduction at maturity and pollen sterility. Seed setting in 4nwas severely affected. Differential response of 2nand 4nin chiasma frequency at different doses was noted. A possible correlation between higher frequency of abnormal cells, univalents, Lagging chromosomes, fragments in 4nwith higher ICV has been proposed.