Population genetics of the freshwater red alga Batrachospermum gelatinosum (Rhodophyta) I: Frequent intragametophytic selfing in a monoicous, haploid-diploid species.
mating system
ploidy
population genetics
sexual system
stream
Journal
Journal of phycology
ISSN: 1529-8817
Titre abrégé: J Phycol
Pays: United States
ID NLM: 9882935
Informations de publication
Date de publication:
28 Oct 2024
28 Oct 2024
Historique:
revised:
23
08
2024
received:
23
04
2024
accepted:
05
09
2024
medline:
28
10
2024
pubmed:
28
10
2024
entrez:
28
10
2024
Statut:
aheadofprint
Résumé
Life cycles with a prolonged haploid phase are thought to be correlated with greater rates of selfing and asexual reproduction. In red algae, recent population genetic studies have aimed to test this prediction but have mostly focused on marine species with separate sexes. We characterized the reproductive system of the obligately monoicous (i.e., hermaphroditic) freshwater red alga Batrachospermum gelatinosum and predicted that we would find genetic signatures of uniparental reproduction because of its haploid-diploid life cycle. We sampled 18 sites and genotyped 311 gametophytes with 10 polymorphic microsatellite loci to describe the reproductive system. Genotypic richness was low (<0.5) and pareto β values (describing clonal membership) were <0.7 for most sites. In taxa with separate sexes, these patterns are typically indicative of asexual reproduction. However, the genetic consequences of selfing in monoicous gametophytes are indistinguishable from those caused by asexual processes. Since we sampled gametophytes and have not yet genotyped the chantransia (i.e., the diploid phase), we interpreted low diversity as a signature of intragametophytic selfing. Additionally, to understand the factors that drive selfing, we tested latitude and several other environmental variables, but none was significantly correlated with the genetic variation we observed. Nevertheless, future studies should genotype the chantransia to measure observed heterozygosity among other summary statistics to disentangle the effects of selfing versus asexual reproduction. Together, these data, coupled with further characterization of abiotic factors that influence population genetic patterns, will allow us to test potential drivers of reproductive system evolution.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : UAB Harold Martin Outstanding Student Development Award
Organisme : Phycological Society of America Grant-in-Aid of Research
Organisme : Phycological Society of America Norma J. Lang Early Career Fellowship
Organisme : Ohio University Student Enhancement Award
Organisme : Ohio Center for Ecology and Evolutionary Studies Fellowship
Organisme : Ohio University Roach Fund
Organisme : Ohio University Graduate Student Senate Original Work Grant
Organisme : Clonix2D
ID : ANR-18-CE32-0001
Organisme : College of Arts and Sciences at UAB start-up funds
Organisme : National Science Foundation CAREER Award
ID : DEB-2141971
Organisme : UAB Blazer Fellowship
Organisme : National Science Foundation Graduate Research Fellowship
ID : 2020295779
Informations de copyright
© 2024 The Author(s). Journal of Phycology published by Wiley Periodicals LLC on behalf of Phycological Society of America.
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