Pedigree analysis of 220 almond genotypes reveals two world mainstream breeding lines based on only three different cultivars.

ABSTRACT: Loss of genetic variability is an increasing challenge in tree breeding programs due to the repeated use of a reduced number of founder genotypes. However, in almond, little is known about the genetic variability in current breeding stocks, although several cases of inbreeding depression have been reported. To gain insights into the genetic structure in modern breeding programs worldwide, marker-verified pedigree data of 220 almond cultivars and breeding selections were analyzed. Inbreeding coefficients, pairwise relatedness, and genetic contribution were calculated for these genotypes. The results reveal two mainstream breeding lines based on three cultivars: "Tuono", "Cristomorto", and "Nonpareil". Descendants from "Tuono" or "Cristomorto" number 76 (sharing 34 descendants), while "Nonpa

SUBMITTER: Perez de Los Cobos F 

PROVIDER: S-EPMC7775440 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature