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Revista Chapingo. Serie horticultura
versión On-line ISSN 2007-4034versión impresa ISSN 1027-152X
Resumen
SAHAGUN-CASTELLANOS, Jaime y RODRIGUEZ-PEREZ, Juan Enrique. Inbreeding of synthetic varieties derived from lines and single crosses. Rev. Chapingo Ser.Hortic [online]. 2011, vol.17, n.3, pp.107-115. ISSN 2007-4034.
The exploitation of heterosis in crops such as tomato (Licopersicon esculentum Mill.), onion (Allium cepa L.) and corn (Zea mays L.) has been limited by the high cost of F1 seed. To avoid this, producers have resorted to using F2, F3 ... seed. However, the inbreeding depression that this practice produces has led plant breeders to consider the synthetic varieties (SVs), particularly for cross-pollinated crops, which are not, however, without problems. In this work, the derivation of a SV whose parents are L lines and s single crosses (SynL'SC) is proposed as a way of decreasing the parent number (originally L+2s lines) and thereby also the costs and work involved in prediction. However, the most important SynL'SC quality indicators must be known in order to make an objective assessment. Thus, the study objectives related to SynL'SC were to determine: 1) the inbreeding coefficient (FSynL'SC) and 2) the best combination of L and s values. The derivation of FSynL'SCwas based on the replacement of the general genotype of the genotypic array of SynL'SC(GASynL'SC) by the coancestry between the individuals that contribute the genes that make up this genotype, and the best combination of L and s values was the one that produced the lowest inbreeding coefficient. From a fixed even number of L + 2s fully inbred and unrelated lines and from two decompositions of GASynL'SC, it was found that FSynL,SC={1+Ls/[2(L+s)2]}/(L+2s). By inspection of the formula, FSynL'SC reaches its minimum in two cases: when L = 0 and when s = 0. However, the use of (L+2s)/2 single crosses requires fewer resources for prediction.
Palabras llave : Allium cepa L.; Zea mays L.; coancestry; prediction; genotypic array.