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    Characterization of N gene homologs in Nicotiana species

    Palmer, Kimberly
    Wiggins, B. E.
    Angel, Carlos Ariel, 1973-
    Balaji, Boovaraghan
    Schoelz, James E. (James Edgar), 1958-
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    [PDF] CharacterizationNGeneHomologs.pdf (18.02Kb)
    Date
    2005
    Contributor
    University of Missouri--Columbia. Office of Undergraduate Research
    Format
    Presentation
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    Abstract
    We have developed a new variety of Nicotiana, N. edwardsonii var. Columbia, that can be used as a bridge plant to move virus resistance genes from N. glutinosa to N. clevelandii, and have made crosses between N. edwardsonii. var. Columbia and N. clevelandii to characterize a single dominant gene that specifies resistance to Tomato bushy stunt virus (TBSV). We have also developed a gene silencing assay that specifically targets host resistance genes that fall into the NBS-LRR category and have used this assay to show that TBSV resistance gene has sequence similarity to the N resistance gene. As a prelude to cloning the TBSV resistanc gene, it is now important to understand how many N gene homologs exist in crosses with N. glutinosa. To examine the diversity of N gene homolog sequences, we developed PCR primers that amplified a 516 bp DNA segment of Exon 2 of the N gene. This PCR reaction yielded multiple products, which were cloned and sequenced. In N. clevelandii, two N homologs predominated. These sequences differed from the N gene by approximately 10%. The analysis of N homologs in N glutinosa is still being completed, but preliminary results indicate that this Nicotiana species contains a broader array of N gene homologs than N. clevelandii.
    URI
    http://hdl.handle.net/10355/2176
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