An adventurous journey toward and away from fern apomixis: Insights from genome size and spore abortion patterns
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F24%3A43908000" target="_blank" >RIV/60076658:12310/24:43908000 - isvavai.cz</a>
Result on the web
<a href="https://bsapubs.onlinelibrary.wiley.com/doi/10.1002/ajb2.16332" target="_blank" >https://bsapubs.onlinelibrary.wiley.com/doi/10.1002/ajb2.16332</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/ajb2.16332" target="_blank" >10.1002/ajb2.16332</a>
Alternative languages
Result language
angličtina
Original language name
An adventurous journey toward and away from fern apomixis: Insights from genome size and spore abortion patterns
Original language description
PremiseApomixis in ferns is relatively common and obligatory. Sterile hybrids may restore fertility via apomixis at a cost of long-term genetic stagnation. In this study, we outlined apomixis as a possible temporary phase leading to sexuality and analyzed factors relating to transitioning to and away from apomixis, such as unreduced and reduced spore formation in apomict and apo-sex hybrid ferns.MethodsWe analyzed the genome size of 15 fern species or hybrids ("taxa") via flow cytometry. The number of reduced and unreduced gametophytes was established as a proxy for viable spore formation of either type. We also calculated the spore abortion ratio (sign of reduced spores) in several taxa, including the apo-sex hybrid Dryopteris x critica and its 16 apomictically formed offspring.ResultsFour of 15 sampled taxa yielded offspring variable in genome size. Specifically, each variable taxon formed one viable reduced plant among 12-451 sampled gametophytes per taxon. Thus, haploid spore formation in the studied apomicts was very rare but possible. Spore abortion analyses indicated gradually decreasing abortion (haploid spore formation) over time. In Dryopteris x critica, abortion decreased from 93.8% to mean 89.5% in one generation.ConclusionsOur results support apomixis as a transitionary phase toward sexuality. Newly formed apomicts hybridize with sexual relatives and continue to form haploid spores early on. Thus, they may get the genomic content necessary for regular meiosis and restore sexuality. If the missing relative goes extinct, the lineage gets locked into apomixis as may be the case with the Dryopteris affinis complex.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10611 - Plant sciences, botany
Result continuities
Project
<a href="/en/project/GA19-17379S" target="_blank" >GA19-17379S: War of dominance between sexuals and apomicts: the mechanisms and consequences of the conflict between the two types of reproduction in wood ferns</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
American Journal of Botany
ISSN
0002-9122
e-ISSN
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Volume of the periodical
111
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
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UT code for WoS article
001225644800001
EID of the result in the Scopus database
2-s2.0-85193597923