Theoretical and Applied Genetics

, Volume 88, Issue 1, pp 116–122 | Cite as

Potential use of random amplified polymorphic DNA (RAPD) technique to study the genetic diversity in Indian mustard (Brassica juncea) and its relationship to heterosis

  • A. Jain
  • S. Bhatia
  • S. S. Banga
  • S. Prakash
  • M. Lakshmikumaran


RAPD assays were performed, using 34 arbitrary decamer oligonucleotide primers and six combinations of two primers, to detect inherent variations and genetic relationships among 12 Indian and 11 exotic B. juncea genotypes. Of 595 amplification products identified, 500 of them were polymorphic across all genotypes. A low level of genetic variability was detected among the Indian genotypes, while considerable polymorphism was present among the exotic ones. Based on the pair-wise comparisons of amplification products the genetic similarity was calculated using Jaccard's similarity coefficients and a dendrogram was constructed using an unweighted pair group method was arithmetical averages (UPGMA). On the basis of this analysis the genotypes were clustered into two groups, A and B. Group A comprised only exotic genotypes, whereas all the Indian genotypes and four of the exotic genotypes were clustered in group B. Almost similar genotypic rankings could also be established by computing as few as 200 amplification products. In general, a high per cent of heterosis was recorded in crosses involving Indian x exotic genotypes. On the other hand, when crosses were made amongst Indian or exotic genotypes, about 80% of them exhibited negative heterosis. Results from this study indicate that, despite the lack of direct correlation between the genetic distance and the degree of heterosis, genetic diversity forms a very useful guide not only for investigating the relationships among Brassica genotypes but also in the selection of parents for heterotic hybrid combinations.

Key words

Brassica juncea RAPD DNA polymorphism Genetic distance Heterosis breeding 


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • A. Jain
    • 1
  • S. Bhatia
    • 1
  • S. S. Banga
    • 2
  • S. Prakash
    • 3
  • M. Lakshmikumaran
    • 1
  1. 1.Biotechnology DivisionTata Energy Research InstituteNew DelhiIndia
  2. 2.Department of Plant BreedingPunjab Agricultural UniversityLudhianaIndia
  3. 3.Biotechnology CentreIndian Agricultural Research InstituteNew DelhiIndia

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