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Common-garden study of introgression at loci associated with traits adaptive to coastal environment from Quercus dentata into Q. mongolica var. crispula
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  • Teruyoshi Nagamitsu,
  • Kentaro Uchiyama,
  • Ayako Izuno,
  • Hajime Shimizu
Teruyoshi Nagamitsu
Forest Research and Management Organisation

Corresponding Author:[email protected]

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Kentaro Uchiyama
Forest Research and Management Organisation
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Ayako Izuno
Forest Research and Management Organisation
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Hajime Shimizu
Hokkaido Research Organisation Forest Research Department
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Abstract

Adaptive introgression has been proposed in oaks (genus Quercus). In northern Japan, Q. mongolica var. crispula (Qc) is common in inland habitats, and Q. dentata (Qd) occurs in coastal habitats. At the northern distributional limit of Qd, Q. × angustilepidota (Qa), a hybrid taxon between Qc and Qd, occurs in coastal habitats. The three taxa, Qc, Qa, and Qd, were transplanted to inland and coastal common gardens (sites). Genotypes at 27495 loci, phenotypes of eight traits of leaves and shoots, and 30-year-old tree size were measured for 224 individuals in both sites. Genotypic variation revealed a hybrid zone between Qc and Qd, including both northern-edge Qd admixed with Qc and coastal Qa backcrossed to Qc. Phenotypes of Qa trees were intermediate between those of Qc and Qd trees. Size of Qa and Qd trees was smaller than that of Qc trees in the inland site but was larger in the coastal site, suggesting adaptation of Qa and Qd to coastal environment. Local ancestry was estimated from phased genotypes of admixed trees using reference genotypes of 47 Qc and 25 Qd trees, indicating heterogeneous ancestry along chromosomes. Association mapping of genotypes and admixture mapping of ancestry suggested that some loci potentially associated with four traits were related to stress response and were located at introgressed genomic regions. Further studies are necessary to show the genetic basis of adaptive introgression resulting in Qd-like phenotypes of Qa in coastal habitats.
17 Aug 2023Submitted to Plant Species Biology
19 Aug 2023Assigned to Editor
19 Aug 2023Submission Checks Completed
19 Aug 2023Review(s) Completed, Editorial Evaluation Pending
28 Aug 2023Reviewer(s) Assigned