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      Cytogenetic characterization of Amaranthus caudatus L. and Amaranthus hybridus subsp . cruentus (L.) Thell.

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          Abstract

          The present study is aimed to identify genetic variability between two species of Amaranthus viz., A. caudatus and A. hybridus subsp. cruentus, two economically important species, cultivated mainly for grain production. Karyomorphological studies in Amaranthus are scarce, probably due to higher number of small sized chromosomes. Karyomorphological studies were conducted using mitotic squash preparation of young healthy root tips. Karyological parameters and karyotypic formula were established using various software programs and tabulated the karyomorphometric and asymmetry indices viz., Disparity index, Variation coefficient, Total forma percentage, Karyotype asymmetry index, Syi index, Rec index, Interchromosomal and Intrachromosomal asymmetry index and Degree of asymmetry of karyotypes. The mitotic chromosome number observed for A. caudatus was 2n = 32 with a gametic number n = 16 and A. hybridus subsp. cruentus was 2n = 34 with a gametic number n = 17. In A. caudatus the chromosome length during somatic metaphase ranged from 0.8698 to 1.7722 μm with a total length of 39.1412 μm. In A. hybridus subsp. cruentus the length of chromosome ranged from 0.7756 to 1.9421 μm with a total length of 44.9922 μm. Various karyomorphometry and asymmetry indices analyzed revealed the extend of interspecific variation and their evolutionary status.

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          Author and article information

          Contributors
          prajithav1@gmail.com
          Journal
          Cytotechnology
          Cytotechnology
          Cytotechnology
          Springer Netherlands (Dordrecht )
          0920-9069
          1573-0778
          5 May 2017
          February 2018
          : 70
          : 1
          : 95-101
          Affiliations
          ISNI 0000 0001 0353 9464, GRID grid.413100.7, Cell and Molecular Biology Division, Department of Botany, , University of Calicut, ; Kerala, 673635 India
          Article
          PMC5809637 PMC5809637 5809637 100
          10.1007/s10616-017-0100-9
          5809637
          28477232
          a03cdf7d-9a56-4020-bffb-a803a0107c19
          © Springer Science+Business Media Dordrecht 2017
          History
          : 21 March 2017
          : 17 April 2017
          Categories
          Original Article
          Custom metadata
          © Springer Science+Business Media B.V., part of Springer Nature 2018

          Karyomorphology,Cytogenetics, Amaranthus hybridus subsp. cruentus , Amaranthus caudatus

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