Abstract
An autotetraploid grain Sorghum plant was located in the hybrid progeny of BD 569×IS 2695 at 40 Krad dose of gamma irradiation in X1 generation. Decrease in plant height, increased size of spikelets, glumes, anthers, receptive prominent stigmas and poor seed set were characteristic features of the tetraploid plant.Pachytene studies revealed exchanges both in hetero and euchromatic regions Average number of chromosomes involved in quadrivalent formation ranged from 30% to 41.74%. Abnormal spindle formation at metaphase, irregular segregation of chromosomes at anaphase were partly responsible for increased pollen sterility and poor seed set percent.
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