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Molecular analysis of micropropagated neem plants using aflp markers for ascertaining clonal fidelity

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Summary

The importance of neem (Azadirachta indica A. Juss.) as a medicinal tree species has been acknowledged worldwide. Superior trees with desired traits such as high azadirachtin content have been identified and micropropagated. Somaclonal variants that may arise in vitro, however, pose limitations to large-scale micropropagation. It is, therefore, imperative to establish genetic uniformity of such plantlets by ensuring strict quality checks at various stages of in vitro culture. This is the first study that evaluates the applicability of amplified fragment length polymorphism (AFLP) markers in establishing clonal fidelity of tissue culture(TC)-raised neem plants. Seven AFLP primer combinations generated a total of 334 amplified fragments across the mother plant, TC progenies, and other neem accessions that were included as controls. Two hundred and thirty-nine amplified fragments were monomorphic across the mother tree and its TC progenies. No extra band was detected in the TC plantlets that was absent in the mother tree, indicating that the TC plantlets regenerated through nodal explants are indeed true-to-type. Ninety-five AFLP fragments were detected in the controls, which allowed their discrimination from the elite mother tree and its TC progenies. Similarity matrix based on Jaccard's coefficient revealed that the pair-wise value between the mother tree and its TC plantlets was ‘1’, indicating perfect similarity. Phenetic dendrogram based on UPGMA (unweighted pair group method of arithmetic averages) analysis further confirmed the true-to-type nature of TC progenies, since a tie was observed between the mother tree and its TC plantlets. On the contrary, the control neem accessions were distinct from the mother and its TC progenies. AFLP markers proved to be an ideal tool for routine analysis and certification of genetic fidelity of micropropagated plants prior to commercialization, especially in tree species because of their long generation time.

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Authors and Affiliations

  1. Plant Molecular Biology Division, Tata Energy Research Institute, Habitat Place, Lodhi Road, 110 003, New Delhi, India

    A. Singh, M. S. Negi & M. Lakshmikumaran

  2. Central Research Institute for Dryland Agriculture, Santoshnagar, 500059, Hyderabad, India

    V. K. Moses & B. Venkateswarlu

  3. Center for Biotechnology, Faculty of Science, Hamdard University, Hamdard Nagar, 110062, New Delhi, India

    P. S. Srivastava

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  1. A. Singh
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  2. M. S. Negi
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  3. V. K. Moses
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  4. B. Venkateswarlu
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  5. P. S. Srivastava
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  6. M. Lakshmikumaran
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Correspondence to M. Lakshmikumaran.

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Singh, A., Negi, M.S., Moses, V.K. et al. Molecular analysis of micropropagated neem plants using aflp markers for ascertaining clonal fidelity. In Vitro Cell Dev Biol -Plant 38, 519–524 (2002). https://doi.org/10.1079/IVP2002341

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  • DOI: https://doi.org/10.1079/IVP2002341

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