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Induction of polyploidy by experimental methods has been proved to be a handy tool in tampering with the genotype of the organisms and in widening the amplitude of variation in the gene pool. Though various methods of induction of polyploidy have been developed, induction through the application of colchicine has been met with remarkable success especially with many herbaceous plants. As a part of the programme of induction of polyploidy in various species of Amaranthaceae two species viz. Amaranthus hypochondriacus L. and Amaranthus dubius Mart. ex Thell. were induced for polyploidy. As the vegetative parts such as the leaf and stem of various species of Amaranthus L. are edible and autopolyploidy very often magnifies the vegetative characters, this programme of work has been undertaken to evaluate whether such an effort will be of economic value and whether some improved varieties of this crop can be raised. Attempts to induce polyploidy in some species of Amaranthus L. had been made in the past. Murray (1940) induced tetraploidy in some monoecious and dioecious species of Amaranthus L. Tandon and Chinoy (1950) also made effort to induce te traploidy in A. blitum L. Recently Pal and Khoshoo (1968) induced tetraploidy in A. edulis Speg. and have made detail analysis of the tetraploids through C0 and C1 generations. About 10 species of Amaranthus L. grow throughout India, almost all of which are edible. The reports of the induction of polyploidy in this genus seem to be fragmentary. With a view to have wide scale induction of polyploidy in this genus the present work is undertaken.

Induced Polyploidy in <i>Amaranthus hypochondriacus</i> L. and <i>Amaranthus dubius</i> Mart. ex Thell