Vigor and variation expressed by anther-derived doubled haploids of burley tobacco (Nicotiana tabacum L.). II: Evaluation of first- and second-cycle doubled haploids

First- and second-cycle doubled haploids of burley tobacco (Nicotiana tabacum L.) were examined to ascertain the significance of source genotype on the performance of anther-derived material and to determine the magnitude of changes from the haploid-production and chromosome-doubling stages. The anther-derived lines evaluated in this study did not exhibit significant yield reductions. However, significant interactions between the cycle comparison and the source genotypes indicated that source genotype can affect the degree of vigor reduction observed.