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Differential admixture and introgression in Cerasus hybrid zones at the south rear edge of cool-temperate C. sargentii and the north leading edge of temperate C. leveilleana
  • Teruyoshi Nagamitsu,
  • Kahoko Tochigi,
  • Shuri Kato
Teruyoshi Nagamitsu
Forest Research and Management Organisation

Corresponding Author:nagamit@ffpri.affrc.go.jp

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Kahoko Tochigi
Tokyo University of Agriculture and Technology
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Shuri Kato
Forest Research and Management Organisation
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Abstract

math_commands Genetic and phenotypic clines in hybrid zones can differ due to various extents of hybridization and selection in heterogeneous environments. Temperate Cerasus leveilleana (Cl) and cool-temperate C. sargentii (Cs) form hybrid zones along elevational gradients. Because their geographic distributional ranges are largely overlapped, the hybrid zones are located across a wide latitudinal range in Japan. We compared variation in genotypes and phenotypes in hybrid zones among the south edge of Cs (south site), the north edge of Cl (north site), and the core of their ranges (central site). Genetic differentiation in nuclear microsatellite genotypes between Cl and Cs was lower, and the proportion of admixed individuals was higher, in the south site than in the central and north sites. Difference in the leaf hair density between Cl and Cs was smaller in the south site than in the central and north sites. Flowering periods at the same elevation were about seven days earlier in Cs than in Cl in the central site, while the periods were about nine days earlier in the south and north sites. These results suggest more admixture in the south site, which may result in introgression in a leaf trait, although staggered flowering is maintained. These findings imply that genetic admixture and phenotypic introgression has been facilitated, except for the latter in traits contributing to reproductive isolation, in the hybrid zone at the south rear edge of either species under the warming trend after the last glacial period.
30 Sep 2024Submitted to Plant Species Biology
02 Oct 2024Submission Checks Completed
02 Oct 2024Assigned to Editor
02 Oct 2024Review(s) Completed, Editorial Evaluation Pending
02 Oct 2024Reviewer(s) Assigned
04 Dec 2024Editorial Decision: Revise Minor