Incidence and evolutionary relevance of autotriploid cytotypes in a relict member of the genus Daphne (Thymelaeaceae)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10475495" target="_blank" >RIV/00216208:11310/23:10475495 - isvavai.cz</a>

Alternative codes found

RIV/60460709:41320/23:97165

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=qo0PCKrt98" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=qo0PCKrt98</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/aobpla/plad056" target="_blank" >10.1093/aobpla/plad056</a>

Result language

angličtina

Original language name

Incidence and evolutionary relevance of autotriploid cytotypes in a relict member of the genus Daphne (Thymelaeaceae)

Original language description

Odd ploidy-level cytotypes in sexually reproducing species are considered a dead end due to absent or reduced fertility. If sterility is only partial, however, their contribution to the population gene pool can be augmented by longevity and clonal growth. To test this, we investigated the cytotype origin and spatial pattern, and pollen viability in three relict shrub species of the genus Daphne (Thymelaeaceae Juss.) in central Europe. Daphne cneorum subsp. cneorum is a widespread European species that has a broad ecological amplitude, whereas D. cneorum subsp. arbusculoides and D. arbuscula are narrow endemics of the western Pannonian Plain and the Western Carpathians, respectively. Our study confirmed that all three taxa are diploid. However, of more than a thousand analysed individuals of D. cneorum subsp. cneorum, five in four different populations were triploid. Our data indicate that these triploids most likely originate from recurrent autopolyploidization events caused by the fusion of reduced and unreduced gametes. High pollen viability was observed in all three taxa and in both diploid and triploid cytotypes, ranging from 65 to 100 %. Our study highlights the significant role of odd ploidy-level cytotypes in interploidy gene flow, calling for more research into their reproduction, genetic variability, and overall fitness. Interestingly, while the endemic D. arbuscula differs from D. cneorum based on genetic and genome size data, D. cneorum subsp. arbusculoides was indistinguishable from D. cneorum subsp. cneorum. However, our study reveals that the subspecies differ in the number of flowers per inflorescence. This is the first comprehensive cytogeographic study of this intriguing genus at a regional scale, and in spite of its karyological stability, it contributes to our understanding of genomic evolution in plant species with a wide ecological amplitude. The presented study sheds light on the emergence of odd-ploidy cytotypes in diploid species, specifically in long-lived relic shrubs from the genus Daphne (Thymeleaceae). Rare odd-ploidy cytotypes are generally considered maladaptive in sexual diploid species due to reduced fitness and fertility. However, our research revealed the independent and recurring evolution of triploid cytotypes, most likely arising via the fusion of reduced and unreduced gametes in exclusively diploid systems and exhibiting significant pollen fertility. Their even partial pollen fertility, especially, in the context of their longevity, can contribute to a more diverse gene pool in their parental diploid populations or even to the spontaneous emergence of new cytotypes. Additionally, we demonstrated that although Daphne cneorum exhibits a large ecological amplitude, spanning various bedrock substrates and altitudinal ranges, its diploid genomes remain highly stable with no ecologically driven genome size expansions or reductions, as previously observed in many species with large ecological amplitudes.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10611 - Plant sciences, botany

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

AoB Plants

ISSN

2041-2851

e-ISSN

2041-2851

Volume of the periodical

15

Issue of the periodical within the volume

5

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

plad056

UT code for WoS article

001061899500003

EID of the result in the Scopus database

2-s2.0-85172897020