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• W2186641936 abstract "Genetic distances (GDs) based on molecular markers such as simple sequence repeats (SSRs) have been proposed as an appropriate tool to assess the genetic conformity between putative essentially derived varieties (EDVs) and their initial varieties (IVs). However, for maize and other crops no consensus has been reached regarding GD thresholds for identification of EDVs, because reliable benchmark data are lacking. The objectives of this study were to (1) estimate the variation in the parental contribution (p) to the genome of homozygous progeny lines derived in recycling breeding programs, (2) investigate the power of SSR-based GD estimates for discriminating between progeny lines derived from F2, BC1, and BC2 populations, (3) exemplify the theoretical and simulated results of a companion study with experimental data, and (4) draw conclusions with regard to various EDV thresholds suggested hitherto. A total of 220 European and U.S. maize inbred lines comprising 163 triplets were genotyped with 100 uniformly distributed SSRs. A triplet consisted of one F2-, or BC1-progeny line and both parental lines. SSR-based estimates of p varied from 0.25 to 0.74 for F2-derived lines with a mean (0.49) close to the expectation (0.50) and ranged from 0.51 to 0.80 for BC1-derived lines with a mean (0.66) significantly smaller than the expectation (0.75). Relative to the variation in p, the GD between progeny lines and parents was less influenced by the variation in the GD between the parents, particularly for BC1-derived lines. Suggested GD thresholds T for EDVs using a fixed GD yielded considerably different values for Type I (α) and Type II (1-β) errors among different gene pools and material groups. Therefore, we recommend germplasm specific thresholds with fixed α or α=1-β." @default.
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• W2186641936 date "2004-01-01" @default.
• W2186641936 modified "2023-09-24" @default.
• W2186641936 title "4. Identification of essentially derived varieties (EDVs) derived from biparental crosses of homozygous lines. I. SSR data from maize inbreds" @default.
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