Tags

Type your tag names separated by a space and hit enter

Gene transfer across species boundaries in bryophytes: evidence from major life cycle stages in Homalothecium lutescens and H. sericeum.
Ann Bot. 2020 03 29; 125(4):565-579.AB

Abstract

BACKGROUND AND AIMS

The mosses Homalothecium lutescens and H. sericeum are genetically, morphologically and ecologically differentiated; mixed populations sometimes occur. In sympatric populations, intermediate character states among gametophytes and sporophytes have been observed, suggesting hybridization and introgression in such populations.

METHODS

We determined genotypes using bi-allelic co-dominant single nucleotide polymorphism (SNP) markers, specific to either H. lutescens or H. sericeum, to estimate the degree of genetic mixing in 449 moss samples collected from seven sympatric and five allopatric populations on the island of Öland, south Sweden. The samples represented three generations: haploid maternal gametophytes; diploid sporophytes; and haploid sporelings.

KEY RESULTS

Admixture analyses of SNP genotypes identified a majority as pure H. lutescens or H. sericeum, but 76 samples were identified as mildly admixed (17 %) and 17 samples (3.8 %) as strongly admixed. Admixed samples were represented in all three generations in several populations. Hybridization and introgression were bidirectional.

CONCLUSIONS

Our results demonstrate that admixed genomes are transferred between the generations, so that the populations behave as true hybrid zones. Earlier studies of sympatric bryophyte populations with admixed individuals have not been able to show that admixed alleles are transferred beyond the first generation. The presence of true hybrid zones has strong evolutionary implications because genetic material transferred across species boundaries can be directly exposed to selection in the long-lived haploid generation of the bryophyte life cycle, and contribute to local adaptation, long-term survival and speciation.

Links

PMC Free PDF

Authors+Show Affiliations

Sawangproh W
Biodiversity, Department of Biology, Lund University, Lund, Sweden. Division of Conservation Biology, School of Interdisciplinary Studies, Mahidol University (Kanchanaburi Campus), Kanchanaburi Province, Thailand.
Hedenäs L
Department of Botany, Swedish Museum of Natural History, Stockholm, Sweden.
Lang AS
Biodiversity, Department of Biology, Lund University, Lund, Sweden.
Hansson B
Department of Biology, Lund University, Lund, Sweden.
Cronberg N
Biodiversity, Department of Biology, Lund University, Lund, Sweden.

MeSH

BryophytaBryopsidaGenetics, PopulationHybridization, GeneticSwedenSympatry

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

31872857

Citation

Sawangproh, W, et al. "Gene Transfer Across Species Boundaries in Bryophytes: Evidence From Major Life Cycle Stages in Homalothecium Lutescens and H. Sericeum." Annals of Botany, vol. 125, no. 4, 2020, pp. 565-579.
Sawangproh W, Hedenäs L, Lang AS, et al. Gene transfer across species boundaries in bryophytes: evidence from major life cycle stages in Homalothecium lutescens and H. sericeum. Ann Bot. 2020;125(4):565-579.
Sawangproh, W., Hedenäs, L., Lang, A. S., Hansson, B., & Cronberg, N. (2020). Gene transfer across species boundaries in bryophytes: evidence from major life cycle stages in Homalothecium lutescens and H. sericeum. Annals of Botany, 125(4), 565-579. https://doi.org/10.1093/aob/mcz209
Sawangproh W, et al. Gene Transfer Across Species Boundaries in Bryophytes: Evidence From Major Life Cycle Stages in Homalothecium Lutescens and H. Sericeum. Ann Bot. 2020 03 29;125(4):565-579. PubMed PMID: 31872857.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Gene transfer across species boundaries in bryophytes: evidence from major life cycle stages in Homalothecium lutescens and H. sericeum. AU - Sawangproh,W, AU - Hedenäs,L, AU - Lang,A S, AU - Hansson,B, AU - Cronberg,N, PY - 2019/06/21/received PY - 2019/12/20/accepted PY - 2019/12/25/pubmed PY - 2020/7/14/medline PY - 2019/12/25/entrez KW - Admixture KW - PCoA KW - STRUCTURE KW - bryophyte KW - hybrid index KW - recombinants SP - 565 EP - 579 JF - Annals of botany JO - Ann Bot VL - 125 IS - 4 N2 - BACKGROUND AND AIMS: The mosses Homalothecium lutescens and H. sericeum are genetically, morphologically and ecologically differentiated; mixed populations sometimes occur. In sympatric populations, intermediate character states among gametophytes and sporophytes have been observed, suggesting hybridization and introgression in such populations. METHODS: We determined genotypes using bi-allelic co-dominant single nucleotide polymorphism (SNP) markers, specific to either H. lutescens or H. sericeum, to estimate the degree of genetic mixing in 449 moss samples collected from seven sympatric and five allopatric populations on the island of Öland, south Sweden. The samples represented three generations: haploid maternal gametophytes; diploid sporophytes; and haploid sporelings. KEY RESULTS: Admixture analyses of SNP genotypes identified a majority as pure H. lutescens or H. sericeum, but 76 samples were identified as mildly admixed (17 %) and 17 samples (3.8 %) as strongly admixed. Admixed samples were represented in all three generations in several populations. Hybridization and introgression were bidirectional. CONCLUSIONS: Our results demonstrate that admixed genomes are transferred between the generations, so that the populations behave as true hybrid zones. Earlier studies of sympatric bryophyte populations with admixed individuals have not been able to show that admixed alleles are transferred beyond the first generation. The presence of true hybrid zones has strong evolutionary implications because genetic material transferred across species boundaries can be directly exposed to selection in the long-lived haploid generation of the bryophyte life cycle, and contribute to local adaptation, long-term survival and speciation. SN - 1095-8290 UR - https://www.unboundmedicine.com/medline/citation/31872857/Gene_transfer_across_species_boundaries_in_bryophytes:_evidence_from_major_life_cycle_stages_in_Homalothecium_lutescens_and_H__sericeum_ DB - PRIME DP - Unbound Medicine ER -