Theoretical and Applied Genetics

, Volume 110, Issue 4, pp 678–687

Transfer of resistance to potato virus Y (PVY) from Nicotiana africana to Nicotiana tabacum: possible influence of tissue culture on the rate of introgression

Original Paper


A disomic chromosome addition line of tobacco, Nicotiana tabacum L., was established previously that possesses a single chromosome pair from N. africana [Merxm. and Buttler]. This addition chromosome carries a gene that confers increased resistance to severe strains of potato virus Y (PVY). Methods to increase the probability of gene transfer from alien chromosomes to tobacco (2n=48) are desired. In the research described here, the PVY resistance gene was transferred to a tobacco chromosome from the N. africana addition chromosome in seven independent cases. One introgression event was obtained using conventional backcrossing of the disomic addition line to N. tabacum cv. Petite Havana, while the remaining six events were obtained using a scheme that involved exposure of explants of the addition line to tissue culture. Twenty-six derived 2n=48 individuals heterozygous for PVY resistance were found to exhibit 24 bivalents or 23 bivalents + 2 univalents at metaphase I. Ovular transmission rates for the PVY resistance factor ranged from 25% to 52%, while pollen transmission rates were much lower, ranging from 0 to 39%. Fifty-one random amplified polymorphic DNA (RAPD) markers specific for the intact addition chromosome were identified and used to characterize derived 2n=48/PVY-resistant genotypes. Variability was observed among these plants with respect to the total number of N. africana RAPD markers that were present, which is an indication that crossing over was occurring within each of the seven introgressed chromosome segments. A limited molecular marker-assisted backcrossing experiment allowed for selection of a 2n=48/PVY-resistant individual that possessed only 6 of the 51 original N. africana RAPD markers. In vitro culture is potentially a valuable system for increasing the rate of alien gene transfer in tobacco, and the successful transfer of PVY resistance from N. africana may allow for an increased level and range of resistance to this virus in tobacco.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Crop ScienceNorth Carolina State UniversityRaleighUSA

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