Abstract
The Rheum species are important medicinal plants that are facing extinction due to their unplanned development and overexploitation by pharmaceutical industries. DNA polymorphisms are not prone to environmental modifications, thus they are widely used for the identification and characterization of plants. The use of different molecular markers has enabled the researchers for the valuation of genetic variability and diversity in its natural zone of distribution. The conventional approach may take several years to yield this information. For the estimation of molecular and genetic variations in geographical zone of distribution, various molecular markers technique are available like RAPD (Randomly Amplified Polymorphic DNA), RFLP (Restriction fragment length polymorphism), ISSR (Inter-Simple Sequence Repeats), SSR and AFLP. The uses of different molecular markers for the study of genetic diversity have been discussed in the review.
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