Analysis of CMA-DAPI bands and preparation of fluorescent karyotypes in thirty Indian cultivars of Lens culinaris

Authors

  • Timir Baran Jha Department of Botany, Maulana Azad College, Kolkata -700013, West Bengal
  • Biplab Kumar Bhowmick Department of Botany, Scottish Church College, 1&3, Urquhart Square, Kolkata- 700006, West Bengal
  • Partha Roy Department of Botany, Maulana Azad College, Kolkata -700013, West Bengal

DOI:

https://doi.org/10.36253/caryologia-919

Keywords:

lentils, CMA-DAPI, chromosomal bands, fluorescent karyotype, heterochromatin

Abstract

India holds a significant rank in production and consumption of the age old protein rich crop Lentil with only one cultivated species and a large number of phenotypically similar cultivars. The need for a reliable and cost effective method of genetic characterization to unravel differences within the Lentil cultivars was felt. The present paper adopted EMA based chromosome preparation followed by staining with two contrasting fluorochrome dyes CMA and DAPI that bind directly to GC and AT rich heterochromatic segments on chromosomes. Analysis of fluorochrome banding pattern furnished a comparative account of genetic diversity within the cultivars that could not be achieved by traditional karyotyping. The marker pair of nucleolar chromosomes (4th and 3rd, majorly) occupied a pivotal position to intensify differences between cultivars in terms of banding patterns around secondary constrictions, suggestive of yet unknown variation in heterochromatin composition. Our study has strengthened genetic background and relationships of Lentil cultivars. We observed certain types of unusual fluorochrome bands that put forward the exclusivity of Indian germplasm and have questioned the mainstream heterochromatin elements of plant chromosomes captured by CMA-DAPI stains. The comprehensive fluorescent karyotypes of 30 L. culinaris Medik. cultivars prepared for the first time, serve as an archetype for the benefit of future breeding programmes. 

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Published

2021-10-08

How to Cite

Jha, T. B., Bhowmick, B. K. ., & Roy, P. (2021). Analysis of CMA-DAPI bands and preparation of fluorescent karyotypes in thirty Indian cultivars of Lens culinaris. Caryologia, 74(2), 65-77. https://doi.org/10.36253/caryologia-919

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Articles