Abstract
Sugarcane mosaic virus (SCMV) is one of the two causative viruses of mosaic in sugarcane, a sugar crop widely grown under tropical and subtropical conditions worldwide. Although molecular characterization of SCMV strains was reported from many countries, strains occurring in India, a major sugarcane producer have not been reported so far. Twenty-six sugarcane samples represented by seven major sugarcane growing states in India and USA were subjected to reverse-transcription polymerase chain reaction (RT-PCR) using a pair of newly designed coat protein specific primers. Among them 17 were found positive to the SCMV infection. The lengths of the sequences derived in this study using the new set of primers varied between 812 and 866 nt. The amino acid sequence comparison of 30 Indian SCMV isolates showed wide range of sequence similarities in core region (88.80–100%) and hyper variable region (51.3–100%). In the N-terminal region of the five Indian isolates, a deletion of 12 aa residues between aa 11 and 30 was observed, whereas the deletion was between aa 45 and 50 in SCMV-B and -D and between aa 61 and 70 in SCMV-A. The phylogenetic analyses performed with 46 SCMV CP sequences for both hyper variable region and core region separated the isolates mostly according to their geographical origin. The 30 Indian SCMV isolates were included exclusively in four groups besides SCMV-IND, which was grouped with SCMV-SC, a type of strain from Australia. Nearly 97.0% of the Indian isolates have no signs for close relationships with previously characterized SCMV type strains (SCMV-A, -B, -D, -E, and -SC) reported from other countries. Our studies revealed that the sugarcane mosaic in India are caused by at least nine new SCMV variants (IND-CC1, -CC2, -CC3, -CC4, -CO1, -CO2, -CP, -CS, and -J) and a type strain SCMV-SC represented by SCMV-IND. This is the first report on the variability and occurrence of new SCMV population in India.
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The authors wish to express sincere thanks to Dr. N. Vijayan Nair, Director of the Institute for the encouragement and facilities. Financial support received from ICAR, New Delhi in the form of Network Project is gratefully acknowledged.
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Viswanathan, R., Karuppaiah, R. & Balamuralikrishnan, M. Identification of new variants of SCMV causing sugarcane mosaic in India and assessing their genetic diversity in relation to SCMV type strains. Virus Genes 39, 375–386 (2009). https://doi.org/10.1007/s11262-009-0399-1
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DOI: https://doi.org/10.1007/s11262-009-0399-1