Induction and Identification of Autotetraploids in Dendrobium Induction and Identification of Autotetraploids in Dendrobium Studies on Polyploid Induction in Anthurium andraeanum Using Oryzalin,Trifluralin and Colchicine Studies on Polyploid Induction in Anthurium andraeanum Using Oryzalin,Trifluralin and Colchicine Study on Tetraploids Induction by Different Mutagens in Garlic