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The Journal of Heredity 1988:79(4):277-283
© 1988 The American Genetic Association 79:277-283

research-article

The Inheritance of Genetic Tumors in Nicotiana Hybrids

Harold H. Smith

Biology Department, Brookhaven National Laboratory Upton, New York

Address reprint requests to Dr. Smith, Biology Department, Brookhaven National Laboratory, Upton, NY 11973.

Abstract

Progenies of the tumorous hybrid Nicotiana glauca (2n = 24) x N. langsdorffii (2n = 18) were backcrossed to N. langsdorffii two to four times and were maintained through 12 generations by self-pollination accompanied throughout by selection for the most tumorous plants as parents. In the more advanced generations, only plants with a specific complex of characters, termed the ß syndrome, produced tumors. All such plants had 19 chromosomes, i.e., the genome of N. langsdorffii plus a single extra, alien chromosome from N. glauca, which was requisite for tumor formation. This chromosome was cytologically distinguishable from the N. langsdorffii complement. It was transmitted through the male to 20% of the progeny and through the female to less than 1%. From self-pollination, 87% of the progeny were of ß syndrome phenotype, and 97% of these were tumorous. The nontumorous ß segregants did nevertheless produce ß offspring that formed tumors, but less frequently (61%) than did the offspring from tumorous parents (96%). Evidence is presented for genes or genomes of N. langsdorffii that reduce tumor expression and for genes or genomes from N. glauca that enhance tumor expression.


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