Deleterious mutation accumulation and the regeneration of genetic resources

摘要: The accumulation of mildly deleterious mutations accompanying recurrent regeneration plant germ plasm was modeled under conditions characterized by different amounts selection and genetic drift. Under some (sample sizes ≥75 individuals bulk harvesting seed) mutation negligible, but others <75 or equalization seed production individual plants) numbers per genome increased significantly during 25–50 cycles regeneration. When also are assumed to occur (at elevated rates) storage, significant fitness decline occurred in 10 fewer regardless the conditions. Calculations were performed determine introduced remaining an existing variety after hybridization with a resource subsequent backcrossing. results suggest that has potential reduce viability materials held collections offset gains expected introduction particular genes interest from resources.