title: Molecular characterization of Citrus tristeza virus isolates from the Northeastern Himalayan region of India.
abstract: Citrus tristeza virus (CTV) isolates from the Darjeeling hills of the Northeastern Himalayan region of India were characterized by biological indexing, multiple molecular marker (MMM) analysis, heteroduplex mobility assay (HMA) and sequence analysis. Variability was studied using the CP gene and a 5' ORF1a fragment of the CTV genome. HMA and sequence analysis of the 5' ORF1a fragment classified Darjeeling isolates into two groups, whereas CP gene analysis provided evidence for three different groups. Darjeeling CTV isolates shared nucleotide sequence identities of 89-97 and 91-92% in the 5' ORF1a fragment and CP gene, respectively, suggesting extensive diversity among CTV isolates from this Indian region.
authors.affiliation: Plant Virology Unit, Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi, India. kkbiswas@mailcity.com
authors.forename: K K
authors.initials: KK
authors.lastname: Biswas
mesh_terms: D036022:Capsid Proteins / Q000235:genetics; D002957:Citrus / Q000821:virology*; D017790:Closterovirus / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification / Q000502:physiology; D005819:Genetic Markers / Q000235:genetics; D014644:Genetic Variation; D020180:Heteroduplex Analysis; D007194:India; D008969:Molecular Sequence Data; D016366:Open Reading Frames / Q000235:genetics; D010802:Phylogeny; D010935:Plant Diseases / Q000821:virology*; D017422:Sequence Analysis, DNA
chemical_list: D036022:Capsid Proteins; D005819:Genetic Markers