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Several environmental and mutagenic factors lead to induce nuclear polymorphism like micronuclei (MN) and nuclear buds. MN are the disintegrated partitioned nuclear or chromosomal fragment. Their occurrence is indicator of genomic instability or chromosomal turmoil. Combined mutagenic treatment of gamma rays and ethyl methane sulphonate (EMS) was experienced to induce formation of MN and nuclear buds in cluster bean [Cyamopsis tetragonoloba (L.) Taub]. A considerable proportion of microcells was also encountered that display future fate of micronuclei in the cell. A peculiar correlation with this nuclear polymorphism was experienced on the presence of bridges and laggards at anaphase I and II stages. Frequency of bridges and laggards were collinear to the combined mutagenic action. Pollen viability was also examined through pollen fertility percentage to inculcate effects of the nuclear incineration on the viability of pollen and the results depicted a dose dependent decline in pollen fertility.

Nuclear Polymorphism Induced Genomic Instability in Cluster Bean [<i>Cyamopsis tetragonoloba</i> (L.) Taub.] (Fabaceae)