| Autor: |
Ortiz R; Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), SE 23436 Lomma, Sweden.; Umeå Plant Science Center, SLU Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences (SLU), SE 90183 Umeå, Sweden., Reslow F; Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), SE 23436 Lomma, Sweden., Vetukuri R; Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), SE 23436 Lomma, Sweden., García-Gil MR; Umeå Plant Science Center, SLU Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences (SLU), SE 90183 Umeå, Sweden., Pérez-Rodríguez P; Colegio de Postgraduados (COLPOS), Montecillos 56230, Edo. de México, Mexico., Crossa J; Colegio de Postgraduados (COLPOS), Montecillos 56230, Edo. de México, Mexico.; International Maize and Wheat Improvement Center (CIMMYT), El Batán, Texcoco 56237, Edo. de México, Mexico. |
| Abstrakt: |
Inbreeding depression (ID) is caused by increased homozygosity in the offspring after selfing. Although the self-compatible, highly heterozygous, tetrasomic polyploid potato ( Solanum tuberosum L.) suffers from ID, some argue that the potential genetic gains from using inbred lines in a sexual propagation system of potato are too large to be ignored. The aim of this research was to assess the effects of inbreeding on potato offspring performance under a high latitude and the accuracy of the genomic prediction of breeding values (GEBVs) for further use in selection. Four inbred (S 1 ) and two hybrid (F 1 ) offspring and their parents (S 0 ) were used in the experiment, with a field layout of an augmented design with the four S 0 replicated in nine incomplete blocks comprising 100, four-plant plots at Umeå (63°49'30″ N 20°15'50″ E), Sweden. S 0 was significantly ( p < 0.01) better than both S 1 and F 1 offspring for tuber weight (total and according to five grading sizes), tuber shape and size uniformity, tuber eye depth and reducing sugars in the tuber flesh, while F 1 was significantly ( p < 0.01) better than S 1 for all tuber weight and uniformity traits. Some F 1 hybrid offspring (15-19%) had better total tuber yield than the best-performing parent. The GEBV accuracy ranged from -0.3928 to 0.4436. Overall, tuber shape uniformity had the highest GEBV accuracy, while tuber weight traits exhibited the lowest accuracy. The F 1 full sib's GEBV accuracy was higher, on average, than that of S 1 . Genomic prediction may facilitate eliminating undesired inbred or hybrid offspring for further use in the genetic betterment of potato. |
