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Research article2023Peer reviewedOpen access

Inbreeding Effects on the Performance and Genomic Prediction for Polysomic Tetraploid Potato Offspring Grown at High Nordic Latitudes

Ortiz, Rodomiro; Reslow, Fredrik; Vetukuri, Ramesh; Garcia-Gil, M. Rosario; Perez-Rodriguez, Paulino; Crossa, Jose


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 Umea (63 & DEG;49 & PRIME;30 & DPRIME; N 20 & DEG;15 & PRIME;50 & DPRIME; 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.


Solanum tuberosum L; accuracy; Fennoscandia; GEBV; genetic gains; germplasm enhancement; hybrid; inbred; QTL; Scandinavia

Published in

2023, Volume: 14, number: 6, article number: 1302Publisher: MDPI