Inheritance in Nicotiana tabacum XXIX: The Relationship of Residual Chromosome Homology to Interspecific Gene Transfer

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Abstract
The dominant genetic marker White Seedling (Ws) of the species Nicotiana plumbaginifolia was transferred repeatedly into a distantly related species N. tabacum. Because of the chromosomal sterility of the interspecific hybrid the transfer was accomplished through the use of triploid and tetraploid hybrids. Nineteen independent homozygous segmental substitution lines have been produced. The different lines varied in quantitative characters. In 8 of the 19 lines the plumbaginifolia marker was incorporated into the same tabacum chromosome, 2 lines fell into each of 3 other tabacum chromosomes, and 5 lines were undetermined. This distribution is clearly non-random and therefore supports the hypothesis that residual homology existed between the 2 species and was responsible for the majority of the interspecific exchanges.