Abstract
Karyo-morphological studies have been carried out in two critically rare, endangered and endemic rhizoma- tous, horticulturally important species of genus Mantisia (Zingiberaceae) from North-East India. The somatic chro- mosome number (2n020) has been recorded in both M. spathulata and M. wengeri with distinct inter-specific variation in the arm ratio of homologous pairs in the comple- ments. All the chromosomes were sub-metacentric in nature (20 L) and more or less symmetrical karyotypes in both the species indicating stabilized genomic pattern. In M. wengeri two chromosome pairs exhibited heteromorphy. Nucleolar organizing region (NOR) and meta-, telo-, and sub- telocentric chromosomes were absolutely lacking. Chromo- some class based on total length of each chromosome as well as its designation through centromeric position was deter- mined. This karyo-morpological study provides valuable baseline genetic data for clearly distinguishing Mantisia (x010) from its phenotypically very similar allied genus Globba L. (x08). Thus, present investigation provides valu- able insight on karyotypic variation, speciation and evolution of the genus Mantisia and also addresses the conservation concerns.
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