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The spatio-temporal diversification of SRK alleles in an Arabidopsis polyploid hybrid and introgression zone
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SYSNO ASEP 0577446 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The spatio-temporal diversification of SRK alleles in an Arabidopsis polyploid hybrid and introgression zone Author(s) Kiefer, C. (DE)
Duarte, P. R. (DE)
Schmickl, Roswitha (BU-J) RID, ORCID
Koch, M.A. (DE)Article number 125760 Source Title Perspectives in Plant Ecology, Evolution and Systematics. - : Elsevier - ISSN 1433-8319
Roč. 61, December (2023)Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords mating system ; polyploidy ; sporophytic self-incompatibility system OECD category Plant sciences, botany Method of publishing Limited access Institutional support BU-J - RVO:67985939 UT WOS 001097493000001 EID SCOPUS 85172667187 DOI https://doi.org/10.1016/j.ppees.2023.125760 Annotation Reproductive barriers and directional geneflow may play a key role in maintaining genetic gradients, thereby allowing ecological differentiation along ecological clines. In Brassicaceae, a sporophytic incompatibility system (SI) contributes to such barriers to geneflow, with the maternal component represented by a large diversity of SRK (stigma-specific S locus receptor kinase) alleles at varying frequencies and levels of dominance. Such clinal genetic gradient along an ecological gradient following a shift towards much drier and warmer conditions and also the bedrock type shifts from calcareous to silicious has been found earlier in an Arabidopsis introgression system involving A. lyrata and A. arenosa. The metapopulation system spans from the northeastern Austrian forealps northward towards the Danube river and the Bohemian massif. Here we explore diversification of population-level SRK gene pools across these hybrid Arabidopsis tetraploid metapopulation system and its putative parental source populations. Since it has been demonstrated that A. lyrata served as the maternal parent and A. arenosa introgressed via pollen constituting a genetic cline with decreasing contribution of A. arenosa genetic background, we test the hypothesis that this cline can be also explained by SRK allelic differentiation. A total of 603 individuals from 45 populations of introgressed and non-introgressed A. lyrata and A. arenosa across a 80 km transect were analysed for SRK allele variation. In total, 22 alleles from all four previously described dominance classes have been documented. Although there is clinal morphological and genetic variation following the introgression zone, SRK alleles do not follow this signature of the paternal taxa. Furthermore, the functional SI system is fully maintained across the transect, and crossing experiments show that there is no decrease in fitness depending on varying distances between populations along the transect studied herein. We conclude that transmission and structure of the SRK allelic gene pool contributes to the postglacial colonization success along such a pronounced ecological gradient maintaining a functional SI system and counteracting genetic depletion. Workplace Institute of Botany Contact Martina Bartošová, martina.bartosova@ibot.cas.cz, ibot@ibot.cas.cz, Tel.: 271 015 242 ; Marie Jakšová, marie.jaksova@ibot.cas.cz, Tel.: 384 721 156-8 Year of Publishing 2024 Electronic address https://doi.org/10.1016/j.ppees.2023.125760
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