Population-genomic analyses reveal bottlenecks and asymmetric introgression from Persian into iron walnut during domestication.

ABSTRACT:

Background

Persian walnut, Juglans regia, occurs naturally from Greece to western China, while its closest relative, the iron walnut, Juglans sigillata, is endemic in southwest China; both species are cultivated for their nuts and wood. Here, we infer their demographic histories and the time and direction of possible hybridization and introgression between them.

Results

We use whole-genome resequencing data, different population-genetic approaches (PSMC and GONE), and isolation-with-migration models (IMa3) on individuals from Europe, Iran, Kazakhstan, Pakistan, and China. IMa3 analyses indicate that the two species diverged from each other by 0.85 million years ago, with unidirectional gene flow from eastern J. regia and its ancestor into J. sigillata, including the shell-th

SUBMITTER: Ding YM 

PROVIDER: S-EPMC9254524 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature