ISOZYME POLYMORPHISM IN DIPLOID AND HEAT SHOCK-INDUCED TETRAPLOID INDIAN MAJOR CARP, LABEO-ROHITA (HAMILTON)

Heat shock-induced tetraploids of Labeo rohita, an Indian major carp, were studied for esterase, glucose-6-phosphate dehydrogenase (G6PD) an d xanthine dehydrogenase polymorphism involving different tissues. Pol ymorphic loci were identified in eye lens, kidney and skeletal muscle for G6PD and only in kidney for esterase of tetraploids, In general, i ntensification of isozyme bands was observed in tetraploids, The polym orphism in G6PD-1 and 2 locus in eye lens, G6PD-2 in kidney and G6PD-1 in skeletal muscle and EST-1 locus in kidney could be used as reliabl e marker in identifying tetraploid stocks from diploids.