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Journal of Virology, April 2000, p. 3130-3134, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Evolutionarily Related Sindbis-Like Plant Viruses Maintain Different Levels of Population Diversity in a Common Host

William L. Schneider and Marilyn J. Roossinck*

Plant Biology Division, Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73402

Received 18 October 1999/Accepted 2 January 2000

The levels of population diversity of three related Sindbis-like plant viruses, Tobacco mosaic virus (TMV), Cucumber mosaic virus (CMV), and Cowpea chlorotic mottle virus (CCMV), in infections of a common host, Nicotiana benthamiana, established from genetically identical viral RNA were examined. Despite probably having a common evolutionary ancestor, the three viruses maintained different levels of population diversity. CMV had the highest levels of diversity, TMV had an intermediate level of diversity, and CCMV had no measurable level of diversity in N. benthamiana. Interestingly, the levels of diversity were correlated to the relative host range sizes of the three viruses. The levels of diversity also remained relatively constant over the course of serial passage. Closer examination of the CMV and TMV populations revealed biases for particular types of substitutions and regions of the genome that may tolerate fewer mutations.

* Corresponding author. Mailing address: Plant Biology Division, Samuel Roberts Noble Foundation, Ardmore, OK 73402. Phone: (580) 221-7342. Fax: (580) 221-7380. E-mail: mroossinck{at}noble.org.

Journal of Virology, April 2000, p. 3130-3134, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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