Assessment of Variability in Plant Viral and Viroid Pathogens

  • P. Narayanasamy


Assessment of variability in different characteristics of viral and viroid pathogens affecting various crops has provided information on the differences in the pathogenic potential, host range and distribution of different strains/variants of a virus or viroid. Biological, immunological and nucleic acid-based techniques have been shown to be efficient and effective in differentiating the strains of viruses to varying degrees. Variations in plant virus strains may occur due to mutation or selection from a mixture of strains, because of the incorporation of resistance gene(s) into the cultivars that were susceptible earlier. Changes in the population structure of viruses have to be constantly monitored by applying sensitive techniques that can provide results rapidly to recognize the occurrence of new more virulent virus strain(s) to facilitate formulation of effective disease management strategies applicable to different ecosystems. Viroids, the simplest plant pathogenic entities containing exclusively short circular RNA molecules, also vary distinctively when their environment is significantly altered. The viroids have high potential for producing variants that can infect different plant species that may be available along with crop plants. In addition, perennial fruit trees with long span of life, may allow accumulation of several sequence variants in the same tree without the need for passage through other plant species. Nucleic acid-based techniques have been demonstrated to be very effective in detecting and differentiating variants even with a change in a single nucleotide in the genome of the viroids.


Cucumber Mosaic Virus Coat Protein Gene Tomato Yellow Leaf Curl Virus Citrus Tristeza Virus Tomato Spot Wilt Virus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer Netherlands 2011

Authors and Affiliations

  1. 1.CoimbatoreIndia

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