Genetic diversity in Costus speciosus (Koen.) Sm.

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Abstract
Chromosome studies were carried out on diploid, triploid and tetraploid populations of C. speciosus distributed in the Eastern Himalayas [India]. Detailed karyotype analysis with suitably modified techniques shows a wide range of structural alterations of chromosomes even within populations of the same ploidy level. Meiotic data reveal 18 bivalents in the tetraploid and varying numbers of bi- and univalents, with rare occurrence of trivalents, in the triploids. The role of allopolyploidy and structural alterations of chromosomes in the evolution of these cytotypes is suggested.

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